/** * @license * Lo-Dash 2.3.0 (Custom Build) <http://lodash.com/> * Build: `lodash modern -o ./dist/lodash.js` * Copyright 2012-2013 The Dojo Foundation <http://dojofoundation.org/> * Based on Underscore.js 1.5.2 <http://underscorejs.org/LICENSE> * Copyright 2009-2013 Jeremy Ashkenas, DocumentCloud and Investigative Reporters & Editors * Available under MIT license <http://lodash.com/license> */ ;(function() { /** Used as a safe reference for `undefined` in pre ES5 environments */ var undefined; /** Used to pool arrays and objects used internally */ var arrayPool = [], objectPool = []; /** Used to generate unique IDs */ var idCounter = 0; /** Used to prefix keys to avoid issues with `__proto__` and properties on `Object.prototype` */ var keyPrefix = +new Date + ''; /** Used as the size when optimizations are enabled for large arrays */ var largeArraySize = 75; /** Used as the max size of the `arrayPool` and `objectPool` */ var maxPoolSize = 40; /** Used to detect and test whitespace */ var whitespace = ( // whitespace ' \t\x0B\f\xA0\ufeff' + // line terminators '\n\r\u2028\u2029' + // unicode category "Zs" space separators '\u1680\u180e\u2000\u2001\u2002\u2003\u2004\u2005\u2006\u2007\u2008\u2009\u200a\u202f\u205f\u3000' ); /** Used to match empty string literals in compiled template source */ var reEmptyStringLeading = /\b__p \+= '';/g, reEmptyStringMiddle = /\b(__p \+=) '' \+/g, reEmptyStringTrailing = /(__e\(.*?\)|\b__t\)) \+\n'';/g; /** * Used to match ES6 template delimiters * http://people.mozilla.org/~jorendorff/es6-draft.html#sec-7.8.6 */ var reEsTemplate = /\$\{([^\\}]*(?:\\.[^\\}]*)*)\}/g; /** Used to match regexp flags from their coerced string values */ var reFlags = /\w*$/; /** Used to detected named functions */ var reFuncName = /^\s*function[ \n\r\t]+\w/; /** Used to match "interpolate" template delimiters */ var reInterpolate = /<%=([\s\S]+?)%>/g; /** Used to match leading whitespace and zeros to be removed */ var reLeadingSpacesAndZeros = RegExp('^[' + whitespace + ']*0+(?=.$)'); /** Used to ensure capturing order of template delimiters */ var reNoMatch = /($^)/; /** Used to detect functions containing a `this` reference */ var reThis = /\bthis\b/; /** Used to match unescaped characters in compiled string literals */ var reUnescapedString = /['\n\r\t\u2028\u2029\\]/g; /** Used to assign default `context` object properties */ var contextProps = [ 'Array', 'Boolean', 'Date', 'Function', 'Math', 'Number', 'Object', 'RegExp', 'String', '_', 'attachEvent', 'clearTimeout', 'isFinite', 'isNaN', 'parseInt', 'setImmediate', 'setTimeout' ]; /** Used to make template sourceURLs easier to identify */ var templateCounter = 0; /** `Object#toString` result shortcuts */ var argsClass = '[object Arguments]', arrayClass = '[object Array]', boolClass = '[object Boolean]', dateClass = '[object Date]', funcClass = '[object Function]', numberClass = '[object Number]', objectClass = '[object Object]', regexpClass = '[object RegExp]', stringClass = '[object String]'; /** Used to identify object classifications that `_.clone` supports */ var cloneableClasses = {}; cloneableClasses[funcClass] = false; cloneableClasses[argsClass] = cloneableClasses[arrayClass] = cloneableClasses[boolClass] = cloneableClasses[dateClass] = cloneableClasses[numberClass] = cloneableClasses[objectClass] = cloneableClasses[regexpClass] = cloneableClasses[stringClass] = true; /** Used as an internal `_.debounce` options object */ var debounceOptions = { 'leading': false, 'maxWait': 0, 'trailing': false }; /** Used as the property descriptor for `__bindData__` */ var descriptor = { 'configurable': false, 'enumerable': false, 'value': null, 'writable': false }; /** Used to determine if values are of the language type Object */ var objectTypes = { 'boolean': false, 'function': true, 'object': true, 'number': false, 'string': false, 'undefined': false }; /** Used to escape characters for inclusion in compiled string literals */ var stringEscapes = { '\\': '\\', "'": "'", '\n': 'n', '\r': 'r', '\t': 't', '\u2028': 'u2028', '\u2029': 'u2029' }; /** Used as a reference to the global object */ var root = (objectTypes[typeof window] && window) || this; /** Detect free variable `exports` */ var freeExports = objectTypes[typeof exports] && exports && !exports.nodeType && exports; /** Detect free variable `module` */ var freeModule = objectTypes[typeof module] && module && !module.nodeType && module; /** Detect the popular CommonJS extension `module.exports` */ var moduleExports = freeModule && freeModule.exports === freeExports && freeExports; /** Detect free variable `global` from Node.js or Browserified code and use it as `root` */ var freeGlobal = objectTypes[typeof global] && global; if (freeGlobal && (freeGlobal.global === freeGlobal || freeGlobal.window === freeGlobal)) { root = freeGlobal; } /*--------------------------------------------------------------------------*/ /** * The base implementation of `_.indexOf` without support for binary searches * or `fromIndex` constraints. * * @private * @param {Array} array The array to search. * @param {*} value The value to search for. * @param {number} [fromIndex=0] The index to search from. * @returns {number} Returns the index of the matched value or `-1`. */ function baseIndexOf(array, value, fromIndex) { var index = (fromIndex || 0) - 1, length = array ? array.length : 0; while (++index < length) { if (array[index] === value) { return index; } } return -1; } /** * An implementation of `_.contains` for cache objects that mimics the return * signature of `_.indexOf` by returning `0` if the value is found, else `-1`. * * @private * @param {Object} cache The cache object to inspect. * @param {*} value The value to search for. * @returns {number} Returns `0` if `value` is found, else `-1`. */ function cacheIndexOf(cache, value) { var type = typeof value; cache = cache.cache; if (type == 'boolean' || value == null) { return cache[value] ? 0 : -1; } if (type != 'number' && type != 'string') { type = 'object'; } var key = type == 'number' ? value : keyPrefix + value; cache = (cache = cache[type]) && cache[key]; return type == 'object' ? (cache && baseIndexOf(cache, value) > -1 ? 0 : -1) : (cache ? 0 : -1); } /** * Adds a given value to the corresponding cache object. * * @private * @param {*} value The value to add to the cache. */ function cachePush(value) { var cache = this.cache, type = typeof value; if (type == 'boolean' || value == null) { cache[value] = true; } else { if (type != 'number' && type != 'string') { type = 'object'; } var key = type == 'number' ? value : keyPrefix + value, typeCache = cache[type] || (cache[type] = {}); if (type == 'object') { (typeCache[key] || (typeCache[key] = [])).push(value); } else { typeCache[key] = true; } } } /** * Used by `_.max` and `_.min` as the default callback when a given * collection is a string value. * * @private * @param {string} value The character to inspect. * @returns {number} Returns the code unit of given character. */ function charAtCallback(value) { return value.charCodeAt(0); } /** * Used by `sortBy` to compare transformed `collection` elements, stable sorting * them in ascending order. * * @private * @param {Object} a The object to compare to `b`. * @param {Object} b The object to compare to `a`. * @returns {number} Returns the sort order indicator of `1` or `-1`. */ function compareAscending(a, b) { var ac = a.criteria, bc = b.criteria; // ensure a stable sort in V8 and other engines // http://code.google.com/p/v8/issues/detail?id=90 if (ac !== bc) { if (ac > bc || typeof ac == 'undefined') { return 1; } if (ac < bc || typeof bc == 'undefined') { return -1; } } // The JS engine embedded in Adobe applications like InDesign has a buggy // `Array#sort` implementation that causes it, under certain circumstances, // to return the same value for `a` and `b`. // See https://github.com/jashkenas/underscore/pull/1247 return a.index - b.index; } /** * Creates a cache object to optimize linear searches of large arrays. * * @private * @param {Array} [array=[]] The array to search. * @returns {null|Object} Returns the cache object or `null` if caching should not be used. */ function createCache(array) { var index = -1, length = array.length, first = array[0], mid = array[(length / 2) | 0], last = array[length - 1]; if (first && typeof first == 'object' && mid && typeof mid == 'object' && last && typeof last == 'object') { return false; } var cache = getObject(); cache['false'] = cache['null'] = cache['true'] = cache['undefined'] = false; var result = getObject(); result.array = array; result.cache = cache; result.push = cachePush; while (++index < length) { result.push(array[index]); } return result; } /** * Used by `template` to escape characters for inclusion in compiled * string literals. * * @private * @param {string} match The matched character to escape. * @returns {string} Returns the escaped character. */ function escapeStringChar(match) { return '\\' + stringEscapes[match]; } /** * Gets an array from the array pool or creates a new one if the pool is empty. * * @private * @returns {Array} The array from the pool. */ function getArray() { return arrayPool.pop() || []; } /** * Gets an object from the object pool or creates a new one if the pool is empty. * * @private * @returns {Object} The object from the pool. */ function getObject() { return objectPool.pop() || { 'array': null, 'cache': null, 'criteria': null, 'false': false, 'index': 0, 'null': false, 'number': null, 'object': null, 'push': null, 'string': null, 'true': false, 'undefined': false, 'value': null }; } /** * Releases the given array back to the array pool. * * @private * @param {Array} [array] The array to release. */ function releaseArray(array) { array.length = 0; if (arrayPool.length < maxPoolSize) { arrayPool.push(array); } } /** * Releases the given object back to the object pool. * * @private * @param {Object} [object] The object to release. */ function releaseObject(object) { var cache = object.cache; if (cache) { releaseObject(cache); } object.array = object.cache = object.criteria = object.object = object.number = object.string = object.value = null; if (objectPool.length < maxPoolSize) { objectPool.push(object); } } /** * Slices the `collection` from the `start` index up to, but not including, * the `end` index. * * Note: This function is used instead of `Array#slice` to support node lists * in IE < 9 and to ensure dense arrays are returned. * * @private * @param {Array|Object|string} collection The collection to slice. * @param {number} start The start index. * @param {number} end The end index. * @returns {Array} Returns the new array. */ function slice(array, start, end) { start || (start = 0); if (typeof end == 'undefined') { end = array ? array.length : 0; } var index = -1, length = end - start || 0, result = Array(length < 0 ? 0 : length); while (++index < length) { result[index] = array[start + index]; } return result; } /*--------------------------------------------------------------------------*/ /** * Create a new `lodash` function using the given context object. * * @static * @memberOf _ * @category Utilities * @param {Object} [context=root] The context object. * @returns {Function} Returns the `lodash` function. */ function runInContext(context) { // Avoid issues with some ES3 environments that attempt to use values, named // after built-in constructors like `Object`, for the creation of literals. // ES5 clears this up by stating that literals must use built-in constructors. // See http://es5.github.io/#x11.1.5. context = context ? _.defaults(root.Object(), context, _.pick(root, contextProps)) : root; /** Native constructor references */ var Array = context.Array, Boolean = context.Boolean, Date = context.Date, Function = context.Function, Math = context.Math, Number = context.Number, Object = context.Object, RegExp = context.RegExp, String = context.String, TypeError = context.TypeError; /** * Used for `Array` method references. * * Normally `Array.prototype` would suffice, however, using an array literal * avoids issues in Narwhal. */ var arrayRef = []; /** Used for native method references */ var objectProto = Object.prototype; /** Used to restore the original `_` reference in `noConflict` */ var oldDash = context._; /** Used to resolve the internal [[Class]] of values */ var toString = objectProto.toString; /** Used to detect if a method is native */ var reNative = RegExp('^' + String(toString) .replace(/[.*+?^${}()|[\]\\]/g, '\\$&') .replace(/toString| for [^\]]+/g, '.*?') + '$' ); /** Native method shortcuts */ var ceil = Math.ceil, clearTimeout = context.clearTimeout, floor = Math.floor, fnToString = Function.prototype.toString, getPrototypeOf = reNative.test(getPrototypeOf = Object.getPrototypeOf) && getPrototypeOf, hasOwnProperty = objectProto.hasOwnProperty, now = reNative.test(now = Date.now) && now || function() { return +new Date; }, push = arrayRef.push, setTimeout = context.setTimeout, splice = arrayRef.splice; /** Used to detect `setImmediate` in Node.js */ var setImmediate = typeof (setImmediate = freeGlobal && moduleExports && freeGlobal.setImmediate) == 'function' && !reNative.test(setImmediate) && setImmediate; /** Used to set meta data on functions */ var defineProperty = (function() { // IE 8 only accepts DOM elements try { var o = {}, func = reNative.test(func = Object.defineProperty) && func, result = func(o, o, o) && func; } catch(e) { } return result; }()); /* Native method shortcuts for methods with the same name as other `lodash` methods */ var nativeCreate = reNative.test(nativeCreate = Object.create) && nativeCreate, nativeIsArray = reNative.test(nativeIsArray = Array.isArray) && nativeIsArray, nativeIsFinite = context.isFinite, nativeIsNaN = context.isNaN, nativeKeys = reNative.test(nativeKeys = Object.keys) && nativeKeys, nativeMax = Math.max, nativeMin = Math.min, nativeParseInt = context.parseInt, nativeRandom = Math.random; /** Used to lookup a built-in constructor by [[Class]] */ var ctorByClass = {}; ctorByClass[arrayClass] = Array; ctorByClass[boolClass] = Boolean; ctorByClass[dateClass] = Date; ctorByClass[funcClass] = Function; ctorByClass[objectClass] = Object; ctorByClass[numberClass] = Number; ctorByClass[regexpClass] = RegExp; ctorByClass[stringClass] = String; /*--------------------------------------------------------------------------*/ /** * Creates a `lodash` object which wraps the given value to enable intuitive * method chaining. * * In addition to Lo-Dash methods, wrappers also have the following `Array` methods: * `concat`, `join`, `pop`, `push`, `reverse`, `shift`, `slice`, `sort`, `splice`, * and `unshift` * * Chaining is supported in custom builds as long as the `value` method is * implicitly or explicitly included in the build. * * The chainable wrapper functions are: * `after`, `assign`, `bind`, `bindAll`, `bindKey`, `chain`, `compact`, * `compose`, `concat`, `countBy`, `create`, `createCallback`, `curry`, * `debounce`, `defaults`, `defer`, `delay`, `difference`, `filter`, `flatten`, * `forEach`, `forEachRight`, `forIn`, `forInRight`, `forOwn`, `forOwnRight`, * `functions`, `groupBy`, `indexBy`, `initial`, `intersection`, `invert`, * `invoke`, `keys`, `map`, `max`, `memoize`, `merge`, `min`, `object`, `omit`, * `once`, `pairs`, `partial`, `partialRight`, `pick`, `pluck`, `pull`, `push`, * `range`, `reject`, `remove`, `rest`, `reverse`, `shuffle`, `slice`, `sort`, * `sortBy`, `splice`, `tap`, `throttle`, `times`, `toArray`, `transform`, * `union`, `uniq`, `unshift`, `unzip`, `values`, `where`, `without`, `wrap`, * and `zip` * * The non-chainable wrapper functions are: * `clone`, `cloneDeep`, `contains`, `escape`, `every`, `find`, `findIndex`, * `findKey`, `findLast`, `findLastIndex`, `findLastKey`, `has`, `identity`, * `indexOf`, `isArguments`, `isArray`, `isBoolean`, `isDate`, `isElement`, * `isEmpty`, `isEqual`, `isFinite`, `isFunction`, `isNaN`, `isNull`, `isNumber`, * `isObject`, `isPlainObject`, `isRegExp`, `isString`, `isUndefined`, `join`, * `lastIndexOf`, `mixin`, `noConflict`, `parseInt`, `pop`, `random`, `reduce`, * `reduceRight`, `result`, `shift`, `size`, `some`, `sortedIndex`, `runInContext`, * `template`, `unescape`, `uniqueId`, and `value` * * The wrapper functions `first` and `last` return wrapped values when `n` is * provided, otherwise they return unwrapped values. * * Explicit chaining can be enabled by using the `_.chain` method. * * @name _ * @constructor * @category Chaining * @param {*} value The value to wrap in a `lodash` instance. * @returns {Object} Returns a `lodash` instance. * @example * * var wrapped = _([1, 2, 3]); * * // returns an unwrapped value * wrapped.reduce(function(sum, num) { * return sum + num; * }); * // => 6 * * // returns a wrapped value * var squares = wrapped.map(function(num) { * return num * num; * }); * * _.isArray(squares); * // => false * * _.isArray(squares.value()); * // => true */ function lodash(value) { // don't wrap if already wrapped, even if wrapped by a different `lodash` constructor return (value && typeof value == 'object' && !isArray(value) && hasOwnProperty.call(value, '__wrapped__')) ? value : new lodashWrapper(value); } /** * A fast path for creating `lodash` wrapper objects. * * @private * @param {*} value The value to wrap in a `lodash` instance. * @param {boolean} chainAll A flag to enable chaining for all methods * @returns {Object} Returns a `lodash` instance. */ function lodashWrapper(value, chainAll) { this.__chain__ = !!chainAll; this.__wrapped__ = value; } // ensure `new lodashWrapper` is an instance of `lodash` lodashWrapper.prototype = lodash.prototype; /** * An object used to flag environments features. * * @static * @memberOf _ * @type Object */ var support = lodash.support = {}; /** * Detect if functions can be decompiled by `Function#toString` * (all but PS3 and older Opera mobile browsers & avoided in Windows 8 apps). * * @memberOf _.support * @type boolean */ support.funcDecomp = !reNative.test(context.WinRTError) && reThis.test(runInContext); /** * Detect if `Function#name` is supported (all but IE). * * @memberOf _.support * @type boolean */ support.funcNames = typeof Function.name == 'string'; /** * By default, the template delimiters used by Lo-Dash are similar to those in * embedded Ruby (ERB). Change the following template settings to use alternative * delimiters. * * @static * @memberOf _ * @type Object */ lodash.templateSettings = { /** * Used to detect `data` property values to be HTML-escaped. * * @memberOf _.templateSettings * @type RegExp */ 'escape': /<%-([\s\S]+?)%>/g, /** * Used to detect code to be evaluated. * * @memberOf _.templateSettings * @type RegExp */ 'evaluate': /<%([\s\S]+?)%>/g, /** * Used to detect `data` property values to inject. * * @memberOf _.templateSettings * @type RegExp */ 'interpolate': reInterpolate, /** * Used to reference the data object in the template text. * * @memberOf _.templateSettings * @type string */ 'variable': '', /** * Used to import variables into the compiled template. * * @memberOf _.templateSettings * @type Object */ 'imports': { /** * A reference to the `lodash` function. * * @memberOf _.templateSettings.imports * @type Function */ '_': lodash } }; /*--------------------------------------------------------------------------*/ /** * The base implementation of `_.bind` that creates the bound function and * sets its meta data. * * @private * @param {Array} bindData The bind data array. * @returns {Function} Returns the new bound function. */ function baseBind(bindData) { var func = bindData[0], partialArgs = bindData[2], thisArg = bindData[4]; function bound() { // `Function#bind` spec // http://es5.github.io/#x15.3.4.5 if (partialArgs) { var args = partialArgs.slice(); push.apply(args, arguments); } // mimic the constructor's `return` behavior // http://es5.github.io/#x13.2.2 if (this instanceof bound) { // ensure `new bound` is an instance of `func` var thisBinding = baseCreate(func.prototype), result = func.apply(thisBinding, args || arguments); return isObject(result) ? result : thisBinding; } return func.apply(thisArg, args || arguments); } setBindData(bound, bindData); return bound; } /** * The base implementation of `_.clone` without argument juggling or support * for `thisArg` binding. * * @private * @param {*} value The value to clone. * @param {boolean} [isDeep=false] Specify a deep clone. * @param {Function} [callback] The function to customize cloning values. * @param {Array} [stackA=[]] Tracks traversed source objects. * @param {Array} [stackB=[]] Associates clones with source counterparts. * @returns {*} Returns the cloned value. */ function baseClone(value, isDeep, callback, stackA, stackB) { if (callback) { var result = callback(value); if (typeof result != 'undefined') { return result; } } // inspect [[Class]] var isObj = isObject(value); if (isObj) { var className = toString.call(value); if (!cloneableClasses[className]) { return value; } var ctor = ctorByClass[className]; switch (className) { case boolClass: case dateClass: return new ctor(+value); case numberClass: case stringClass: return new ctor(value); case regexpClass: result = ctor(value.source, reFlags.exec(value)); result.lastIndex = value.lastIndex; return result; } } else { return value; } var isArr = isArray(value); if (isDeep) { // check for circular references and return corresponding clone var initedStack = !stackA; stackA || (stackA = getArray()); stackB || (stackB = getArray()); var length = stackA.length; while (length--) { if (stackA[length] == value) { return stackB[length]; } } result = isArr ? ctor(value.length) : {}; } else { result = isArr ? slice(value) : assign({}, value); } // add array properties assigned by `RegExp#exec` if (isArr) { if (hasOwnProperty.call(value, 'index')) { result.index = value.index; } if (hasOwnProperty.call(value, 'input')) { result.input = value.input; } } // exit for shallow clone if (!isDeep) { return result; } // add the source value to the stack of traversed objects // and associate it with its clone stackA.push(value); stackB.push(result); // recursively populate clone (susceptible to call stack limits) (isArr ? forEach : forOwn)(value, function(objValue, key) { result[key] = baseClone(objValue, isDeep, callback, stackA, stackB); }); if (initedStack) { releaseArray(stackA); releaseArray(stackB); } return result; } /** * The base implementation of `_.create` without support for assigning * properties to the created object. * * @private * @param {Object} prototype The object to inherit from. * @returns {Object} Returns the new object. */ function baseCreate(prototype, properties) { return isObject(prototype) ? nativeCreate(prototype) : {}; } // fallback for browsers without `Object.create` if (!nativeCreate) { baseCreate = (function() { function Object() {} return function(prototype) { if (isObject(prototype)) { Object.prototype = prototype; var result = new Object; Object.prototype = null; } return result || context.Object(); }; }()); } /** * The base implementation of `_.createCallback` without support for creating * "_.pluck" or "_.where" style callbacks. * * @private * @param {*} [func=identity] The value to convert to a callback. * @param {*} [thisArg] The `this` binding of the created callback. * @param {number} [argCount] The number of arguments the callback accepts. * @returns {Function} Returns a callback function. */ function baseCreateCallback(func, thisArg, argCount) { if (typeof func != 'function') { return identity; } // exit early for no `thisArg` or already bound by `Function#bind` if (typeof thisArg == 'undefined' || !('prototype' in func)) { return func; } var bindData = func.__bindData__; if (typeof bindData == 'undefined') { if (support.funcNames) { bindData = !func.name; } bindData = bindData || !support.funcDecomp; if (!bindData) { var source = fnToString.call(func); if (!support.funcNames) { bindData = !reFuncName.test(source); } if (!bindData) { // checks if `func` references the `this` keyword and stores the result bindData = reThis.test(source); setBindData(func, bindData); } } } // exit early if there are no `this` references or `func` is bound if (bindData === false || (bindData !== true && bindData[1] & 1)) { return func; } switch (argCount) { case 1: return function(value) { return func.call(thisArg, value); }; case 2: return function(a, b) { return func.call(thisArg, a, b); }; case 3: return function(value, index, collection) { return func.call(thisArg, value, index, collection); }; case 4: return function(accumulator, value, index, collection) { return func.call(thisArg, accumulator, value, index, collection); }; } return bind(func, thisArg); } /** * The base implementation of `createWrapper` that creates the wrapper and * sets its meta data. * * @private * @param {Array} bindData The bind data array. * @returns {Function} Returns the new function. */ function baseCreateWrapper(bindData) { var func = bindData[0], bitmask = bindData[1], partialArgs = bindData[2], partialRightArgs = bindData[3], thisArg = bindData[4], arity = bindData[5]; var isBind = bitmask & 1, isBindKey = bitmask & 2, isCurry = bitmask & 4, isCurryBound = bitmask & 8, key = func; function bound() { var thisBinding = isBind ? thisArg : this; if (partialArgs) { var args = partialArgs.slice(); push.apply(args, arguments); } if (partialRightArgs || isCurry) { args || (args = slice(arguments)); if (partialRightArgs) { push.apply(args, partialRightArgs); } if (isCurry && args.length < arity) { bitmask |= 16 & ~32; return baseCreateWrapper([func, (isCurryBound ? bitmask : bitmask & ~3), args, null, thisArg, arity]); } } args || (args = arguments); if (isBindKey) { func = thisBinding[key]; } if (this instanceof bound) { thisBinding = baseCreate(func.prototype); var result = func.apply(thisBinding, args); return isObject(result) ? result : thisBinding; } return func.apply(thisBinding, args); } setBindData(bound, bindData); return bound; } /** * The base implementation of `_.difference` that accepts a single array * of values to exclude. * * @private * @param {Array} array The array to process. * @param {Array} [values] The array of values to exclude. * @returns {Array} Returns a new array of filtered values. */ function baseDifference(array, values) { var index = -1, indexOf = getIndexOf(), length = array ? array.length : 0, isLarge = length >= largeArraySize && indexOf === baseIndexOf, result = []; if (isLarge) { var cache = createCache(values); if (cache) { indexOf = cacheIndexOf; values = cache; } else { isLarge = false; } } while (++index < length) { var value = array[index]; if (indexOf(values, value) < 0) { result.push(value); } } if (isLarge) { releaseObject(values); } return result; } /** * The base implementation of `_.flatten` without support for callback * shorthands or `thisArg` binding. * * @private * @param {Array} array The array to flatten. * @param {boolean} [isShallow=false] A flag to restrict flattening to a single level. * @param {boolean} [isStrict=false] A flag to restrict flattening to arrays and `arguments` objects. * @param {number} [fromIndex=0] The index to start from. * @returns {Array} Returns a new flattened array. */ function baseFlatten(array, isShallow, isStrict, fromIndex) { var index = (fromIndex || 0) - 1, length = array ? array.length : 0, result = []; while (++index < length) { var value = array[index]; if (value && typeof value == 'object' && typeof value.length == 'number' && (isArray(value) || isArguments(value))) { // recursively flatten arrays (susceptible to call stack limits) if (!isShallow) { value = baseFlatten(value, isShallow, isStrict); } var valIndex = -1, valLength = value.length, resIndex = result.length; result.length += valLength; while (++valIndex < valLength) { result[resIndex++] = value[valIndex]; } } else if (!isStrict) { result.push(value); } } return result; } /** * The base implementation of `_.isEqual`, without support for `thisArg` binding, * that allows partial "_.where" style comparisons. * * @private * @param {*} a The value to compare. * @param {*} b The other value to compare. * @param {Function} [callback] The function to customize comparing values. * @param {Function} [isWhere=false] A flag to indicate performing partial comparisons. * @param {Array} [stackA=[]] Tracks traversed `a` objects. * @param {Array} [stackB=[]] Tracks traversed `b` objects. * @returns {boolean} Returns `true` if the values are equivalent, else `false`. */ function baseIsEqual(a, b, callback, isWhere, stackA, stackB) { // used to indicate that when comparing objects, `a` has at least the properties of `b` if (callback) { var result = callback(a, b); if (typeof result != 'undefined') { return !!result; } } // exit early for identical values if (a === b) { // treat `+0` vs. `-0` as not equal return a !== 0 || (1 / a == 1 / b); } var type = typeof a, otherType = typeof b; // exit early for unlike primitive values if (a === a && !(a && objectTypes[type]) && !(b && objectTypes[otherType])) { return false; } // exit early for `null` and `undefined` avoiding ES3's Function#call behavior // http://es5.github.io/#x15.3.4.4 if (a == null || b == null) { return a === b; } // compare [[Class]] names var className = toString.call(a), otherClass = toString.call(b); if (className == argsClass) { className = objectClass; } if (otherClass == argsClass) { otherClass = objectClass; } if (className != otherClass) { return false; } switch (className) { case boolClass: case dateClass: // coerce dates and booleans to numbers, dates to milliseconds and booleans // to `1` or `0` treating invalid dates coerced to `NaN` as not equal return +a == +b; case numberClass: // treat `NaN` vs. `NaN` as equal return (a != +a) ? b != +b // but treat `+0` vs. `-0` as not equal : (a == 0 ? (1 / a == 1 / b) : a == +b); case regexpClass: case stringClass: // coerce regexes to strings (http://es5.github.io/#x15.10.6.4) // treat string primitives and their corresponding object instances as equal return a == String(b); } var isArr = className == arrayClass; if (!isArr) { // unwrap any `lodash` wrapped values var aWrapped = hasOwnProperty.call(a, '__wrapped__'), bWrapped = hasOwnProperty.call(b, '__wrapped__'); if (aWrapped || bWrapped) { return baseIsEqual(aWrapped ? a.__wrapped__ : a, bWrapped ? b.__wrapped__ : b, callback, isWhere, stackA, stackB); } // exit for functions and DOM nodes if (className != objectClass) { return false; } // in older versions of Opera, `arguments` objects have `Array` constructors var ctorA = a.constructor, ctorB = b.constructor; // non `Object` object instances with different constructors are not equal if (ctorA != ctorB && !(isFunction(ctorA) && ctorA instanceof ctorA && isFunction(ctorB) && ctorB instanceof ctorB) && ('constructor' in a && 'constructor' in b) ) { return false; } } // assume cyclic structures are equal // the algorithm for detecting cyclic structures is adapted from ES 5.1 // section 15.12.3, abstract operation `JO` (http://es5.github.io/#x15.12.3) var initedStack = !stackA; stackA || (stackA = getArray()); stackB || (stackB = getArray()); var length = stackA.length; while (length--) { if (stackA[length] == a) { return stackB[length] == b; } } var size = 0; result = true; // add `a` and `b` to the stack of traversed objects stackA.push(a); stackB.push(b); // recursively compare objects and arrays (susceptible to call stack limits) if (isArr) { length = a.length; size = b.length; // compare lengths to determine if a deep comparison is necessary result = size == a.length; if (!result && !isWhere) { return result; } // deep compare the contents, ignoring non-numeric properties while (size--) { var index = length, value = b[size]; if (isWhere) { while (index--) { if ((result = baseIsEqual(a[index], value, callback, isWhere, stackA, stackB))) { break; } } } else if (!(result = baseIsEqual(a[size], value, callback, isWhere, stackA, stackB))) { break; } } return result; } // deep compare objects using `forIn`, instead of `forOwn`, to avoid `Object.keys` // which, in this case, is more costly forIn(b, function(value, key, b) { if (hasOwnProperty.call(b, key)) { // count the number of properties. size++; // deep compare each property value. return (result = hasOwnProperty.call(a, key) && baseIsEqual(a[key], value, callback, isWhere, stackA, stackB)); } }); if (result && !isWhere) { // ensure both objects have the same number of properties forIn(a, function(value, key, a) { if (hasOwnProperty.call(a, key)) { // `size` will be `-1` if `a` has more properties than `b` return (result = --size > -1); } }); } if (initedStack) { releaseArray(stackA); releaseArray(stackB); } return result; } /** * The base implementation of `_.merge` without argument juggling or support * for `thisArg` binding. * * @private * @param {Object} object The destination object. * @param {Object} source The source object. * @param {Function} [callback] The function to customize merging properties. * @param {Array} [stackA=[]] Tracks traversed source objects. * @param {Array} [stackB=[]] Associates values with source counterparts. */ function baseMerge(object, source, callback, stackA, stackB) { (isArray(source) ? forEach : forOwn)(source, function(source, key) { var found, isArr, result = source, value = object[key]; if (source && ((isArr = isArray(source)) || isPlainObject(source))) { // avoid merging previously merged cyclic sources var stackLength = stackA.length; while (stackLength--) { if ((found = stackA[stackLength] == source)) { value = stackB[stackLength]; break; } } if (!found) { var isShallow; if (callback) { result = callback(value, source); if ((isShallow = typeof result != 'undefined')) { value = result; } } if (!isShallow) { value = isArr ? (isArray(value) ? value : []) : (isPlainObject(value) ? value : {}); } // add `source` and associated `value` to the stack of traversed objects stackA.push(source); stackB.push(value); // recursively merge objects and arrays (susceptible to call stack limits) if (!isShallow) { baseMerge(value, source, callback, stackA, stackB); } } } else { if (callback) { result = callback(value, source); if (typeof result == 'undefined') { result = source; } } if (typeof result != 'undefined') { value = result; } } object[key] = value; }); } /** * The base implementation of `_.random` without argument juggling or support * for returning floating-point numbers. * * @private * @param {number} min The minimum possible value. * @param {number} max The maximum possible value. * @returns {number} Returns a random number. */ function baseRandom(min, max) { return min + floor(nativeRandom() * (max - min + 1)); } /** * The base implementation of `_.uniq` without support for callback shorthands * or `thisArg` binding. * * @private * @param {Array} array The array to process. * @param {boolean} [isSorted=false] A flag to indicate that `array` is sorted. * @param {Function} [callback] The function called per iteration. * @returns {Array} Returns a duplicate-value-free array. */ function baseUniq(array, isSorted, callback) { var index = -1, indexOf = getIndexOf(), length = array ? array.length : 0, result = []; var isLarge = !isSorted && length >= largeArraySize && indexOf === baseIndexOf, seen = (callback || isLarge) ? getArray() : result; if (isLarge) { var cache = createCache(seen); if (cache) { indexOf = cacheIndexOf; seen = cache; } else { isLarge = false; seen = callback ? seen : (releaseArray(seen), result); } } while (++index < length) { var value = array[index], computed = callback ? callback(value, index, array) : value; if (isSorted ? !index || seen[seen.length - 1] !== computed : indexOf(seen, computed) < 0 ) { if (callback || isLarge) { seen.push(computed); } result.push(value); } } if (isLarge) { releaseArray(seen.array); releaseObject(seen); } else if (callback) { releaseArray(seen); } return result; } /** * Creates a function that aggregates a collection, creating an object composed * of keys generated from the results of running each element of the collection * through a callback. The given `setter` function sets the keys and values * of the composed object. * * @private * @param {Function} setter The setter function. * @returns {Function} Returns the new aggregator function. */ function createAggregator(setter) { return function(collection, callback, thisArg) { var result = {}; callback = lodash.createCallback(callback, thisArg, 3); var index = -1, length = collection ? collection.length : 0; if (typeof length == 'number') { while (++index < length) { var value = collection[index]; setter(result, value, callback(value, index, collection), collection); } } else { forOwn(collection, function(value, key, collection) { setter(result, value, callback(value, key, collection), collection); }); } return result; }; } /** * Creates a function that, when called, either curries or invokes `func` * with an optional `this` binding and partially applied arguments. * * @private * @param {Function|string} func The function or method name to reference. * @param {number} bitmask The bitmask of method flags to compose. * The bitmask may be composed of the following flags: * 1 - `_.bind` * 2 - `_.bindKey` * 4 - `_.curry` * 8 - `_.curry` (bound) * 16 - `_.partial` * 32 - `_.partialRight` * @param {Array} [partialArgs] An array of arguments to prepend to those * provided to the new function. * @param {Array} [partialRightArgs] An array of arguments to append to those * provided to the new function. * @param {*} [thisArg] The `this` binding of `func`. * @param {number} [arity] The arity of `func`. * @returns {Function} Returns the new function. */ function createWrapper(func, bitmask, partialArgs, partialRightArgs, thisArg, arity) { var isBind = bitmask & 1, isBindKey = bitmask & 2, isCurry = bitmask & 4, isCurryBound = bitmask & 8, isPartial = bitmask & 16, isPartialRight = bitmask & 32; if (!isBindKey && !isFunction(func)) { throw new TypeError; } if (isPartial && !partialArgs.length) { bitmask &= ~16; isPartial = partialArgs = false; } if (isPartialRight && !partialRightArgs.length) { bitmask &= ~32; isPartialRight = partialRightArgs = false; } var bindData = func && func.__bindData__; if (bindData && bindData !== true) { bindData = bindData.slice(); // set `thisBinding` is not previously bound if (isBind && !(bindData[1] & 1)) { bindData[4] = thisArg; } // set if previously bound but not currently (subsequent curried functions) if (!isBind && bindData[1] & 1) { bitmask |= 8; } // set curried arity if not yet set if (isCurry && !(bindData[1] & 4)) { bindData[5] = arity; } // append partial left arguments if (isPartial) { push.apply(bindData[2] || (bindData[2] = []), partialArgs); } // append partial right arguments if (isPartialRight) { push.apply(bindData[3] || (bindData[3] = []), partialRightArgs); } // merge flags bindData[1] |= bitmask; return createWrapper.apply(null, bindData); } // fast path for `_.bind` var creater = (bitmask == 1 || bitmask === 17) ? baseBind : baseCreateWrapper; return creater([func, bitmask, partialArgs, partialRightArgs, thisArg, arity]); } /** * Used by `escape` to convert characters to HTML entities. * * @private * @param {string} match The matched character to escape. * @returns {string} Returns the escaped character. */ function escapeHtmlChar(match) { return htmlEscapes[match]; } /** * Gets the appropriate "indexOf" function. If the `_.indexOf` method is * customized, this method returns the custom method, otherwise it returns * the `baseIndexOf` function. * * @private * @returns {Function} Returns the "indexOf" function. */ function getIndexOf() { var result = (result = lodash.indexOf) === indexOf ? baseIndexOf : result; return result; } /** * Sets `this` binding data on a given function. * * @private * @param {Function} func The function to set data on. * @param {Array} value The data array to set. */ var setBindData = !defineProperty ? noop : function(func, value) { descriptor.value = value; defineProperty(func, '__bindData__', descriptor); }; /** * A fallback implementation of `isPlainObject` which checks if a given value * is an object created by the `Object` constructor, assuming objects created * by the `Object` constructor have no inherited enumerable properties and that * there are no `Object.prototype` extensions. * * @private * @param {*} value The value to check. * @returns {boolean} Returns `true` if `value` is a plain object, else `false`. */ function shimIsPlainObject(value) { var ctor, result; // avoid non Object objects, `arguments` objects, and DOM elements if (!(value && toString.call(value) == objectClass) || (ctor = value.constructor, isFunction(ctor) && !(ctor instanceof ctor))) { return false; } // In most environments an object's own properties are iterated before // its inherited properties. If the last iterated property is an object's // own property then there are no inherited enumerable properties. forIn(value, function(value, key) { result = key; }); return typeof result == 'undefined' || hasOwnProperty.call(value, result); } /** * Used by `unescape` to convert HTML entities to characters. * * @private * @param {string} match The matched character to unescape. * @returns {string} Returns the unescaped character. */ function unescapeHtmlChar(match) { return htmlUnescapes[match]; } /*--------------------------------------------------------------------------*/ /** * Checks if `value` is an `arguments` object. * * @static * @memberOf _ * @category Objects * @param {*} value The value to check. * @returns {boolean} Returns `true` if the `value` is an `arguments` object, else `false`. * @example * * (function() { return _.isArguments(arguments); })(1, 2, 3); * // => true * * _.isArguments([1, 2, 3]); * // => false */ function isArguments(value) { return value && typeof value == 'object' && typeof value.length == 'number' && toString.call(value) == argsClass || false; } /** * Checks if `value` is an array. * * @static * @memberOf _ * @type Function * @category Objects * @param {*} value The value to check. * @returns {boolean} Returns `true` if the `value` is an array, else `false`. * @example * * (function() { return _.isArray(arguments); })(); * // => false * * _.isArray([1, 2, 3]); * // => true */ var isArray = nativeIsArray || function(value) { return value && typeof value == 'object' && typeof value.length == 'number' && toString.call(value) == arrayClass || false; }; /** * A fallback implementation of `Object.keys` which produces an array of the * given object's own enumerable property names. * * @private * @type Function * @param {Object} object The object to inspect. * @returns {Array} Returns an array of property names. */ var shimKeys = function(object) { var index, iterable = object, result = []; if (!iterable) return result; if (!(objectTypes[typeof object])) return result; for (index in iterable) { if (hasOwnProperty.call(iterable, index)) { result.push(index); } } return result }; /** * Creates an array composed of the own enumerable property names of an object. * * @static * @memberOf _ * @category Objects * @param {Object} object The object to inspect. * @returns {Array} Returns an array of property names. * @example * * _.keys({ 'one': 1, 'two': 2, 'three': 3 }); * // => ['one', 'two', 'three'] (property order is not guaranteed across environments) */ var keys = !nativeKeys ? shimKeys : function(object) { if (!isObject(object)) { return []; } return nativeKeys(object); }; /** * Used to convert characters to HTML entities: * * Though the `>` character is escaped for symmetry, characters like `>` and `/` * don't require escaping in HTML and have no special meaning unless they're part * of a tag or an unquoted attribute value. * http://mathiasbynens.be/notes/ambiguous-ampersands (under "semi-related fun fact") */ var htmlEscapes = { '&': '&', '<': '<', '>': '>', '"': '"', "'": ''' }; /** Used to convert HTML entities to characters */ var htmlUnescapes = invert(htmlEscapes); /** Used to match HTML entities and HTML characters */ var reEscapedHtml = RegExp('(' + keys(htmlUnescapes).join('|') + ')', 'g'), reUnescapedHtml = RegExp('[' + keys(htmlEscapes).join('') + ']', 'g'); /*--------------------------------------------------------------------------*/ /** * Assigns own enumerable properties of source object(s) to the destination * object. Subsequent sources will overwrite property assignments of previous * sources. If a callback is provided it will be executed to produce the * assigned values. The callback is bound to `thisArg` and invoked with two * arguments; (objectValue, sourceValue). * * @static * @memberOf _ * @type Function * @alias extend * @category Objects * @param {Object} object The destination object. * @param {...Object} [source] The source objects. * @param {Function} [callback] The function to customize assigning values. * @param {*} [thisArg] The `this` binding of `callback`. * @returns {Object} Returns the destination object. * @example * * _.assign({ 'name': 'fred' }, { 'employer': 'slate' }); * // => { 'name': 'fred', 'employer': 'slate' } * * var defaults = _.partialRight(_.assign, function(a, b) { * return typeof a == 'undefined' ? b : a; * }); * * var object = { 'name': 'barney' }; * defaults(object, { 'name': 'fred', 'employer': 'slate' }); * // => { 'name': 'barney', 'employer': 'slate' } */ var assign = function(object, source, guard) { var index, iterable = object, result = iterable; if (!iterable) return result; var args = arguments, argsIndex = 0, argsLength = typeof guard == 'number' ? 2 : args.length; if (argsLength > 3 && typeof args[argsLength - 2] == 'function') { var callback = baseCreateCallback(args[--argsLength - 1], args[argsLength--], 2); } else if (argsLength > 2 && typeof args[argsLength - 1] == 'function') { callback = args[--argsLength]; } while (++argsIndex < argsLength) { iterable = args[argsIndex]; if (iterable && objectTypes[typeof iterable]) { var ownIndex = -1, ownProps = objectTypes[typeof iterable] && keys(iterable), length = ownProps ? ownProps.length : 0; while (++ownIndex < length) { index = ownProps[ownIndex]; result[index] = callback ? callback(result[index], iterable[index]) : iterable[index]; } } } return result }; /** * Creates a clone of `value`. If `isDeep` is `true` nested objects will also * be cloned, otherwise they will be assigned by reference. If a callback * is provided it will be executed to produce the cloned values. If the * callback returns `undefined` cloning will be handled by the method instead. * The callback is bound to `thisArg` and invoked with one argument; (value). * * @static * @memberOf _ * @category Objects * @param {*} value The value to clone. * @param {boolean} [isDeep=false] Specify a deep clone. * @param {Function} [callback] The function to customize cloning values. * @param {*} [thisArg] The `this` binding of `callback`. * @returns {*} Returns the cloned value. * @example * * var characters = [ * { 'name': 'barney', 'age': 36 }, * { 'name': 'fred', 'age': 40 } * ]; * * var shallow = _.clone(characters); * shallow[0] === characters[0]; * // => true * * var deep = _.clone(characters, true); * deep[0] === characters[0]; * // => false * * _.mixin({ * 'clone': _.partialRight(_.clone, function(value) { * return _.isElement(value) ? value.cloneNode(false) : undefined; * }) * }); * * var clone = _.clone(document.body); * clone.childNodes.length; * // => 0 */ function clone(value, isDeep, callback, thisArg) { // allows working with "Collections" methods without using their `index` // and `collection` arguments for `isDeep` and `callback` if (typeof isDeep != 'boolean' && isDeep != null) { thisArg = callback; callback = isDeep; isDeep = false; } return baseClone(value, isDeep, typeof callback == 'function' && baseCreateCallback(callback, thisArg, 1)); } /** * Creates a deep clone of `value`. If a callback is provided it will be * executed to produce the cloned values. If the callback returns `undefined` * cloning will be handled by the method instead. The callback is bound to * `thisArg` and invoked with one argument; (value). * * Note: This method is loosely based on the structured clone algorithm. Functions * and DOM nodes are **not** cloned. The enumerable properties of `arguments` objects and * objects created by constructors other than `Object` are cloned to plain `Object` objects. * See http://www.w3.org/TR/html5/infrastructure.html#internal-structured-cloning-algorithm. * * @static * @memberOf _ * @category Objects * @param {*} value The value to deep clone. * @param {Function} [callback] The function to customize cloning values. * @param {*} [thisArg] The `this` binding of `callback`. * @returns {*} Returns the deep cloned value. * @example * * var characters = [ * { 'name': 'barney', 'age': 36 }, * { 'name': 'fred', 'age': 40 } * ]; * * var deep = _.cloneDeep(characters); * deep[0] === characters[0]; * // => false * * var view = { * 'label': 'docs', * 'node': element * }; * * var clone = _.cloneDeep(view, function(value) { * return _.isElement(value) ? value.cloneNode(true) : undefined; * }); * * clone.node == view.node; * // => false */ function cloneDeep(value, callback, thisArg) { return baseClone(value, true, typeof callback == 'function' && baseCreateCallback(callback, thisArg, 1)); } /** * Creates an object that inherits from the given `prototype` object. If a * `properties` object is provided its own enumerable properties are assigned * to the created object. * * @static * @memberOf _ * @category Objects * @param {Object} prototype The object to inherit from. * @param {Object} [properties] The properties to assign to the object. * @returns {Object} Returns the new object. * @example * * function Shape() { * this.x = 0; * this.y = 0; * } * * function Circle() { * Shape.call(this); * } * * Circle.prototype = _.create(Shape.prototype, { 'constructor': Circle }); * * var circle = new Circle; * circle instanceof Circle; * // => true * * circle instanceof Shape; * // => true */ function create(prototype, properties) { var result = baseCreate(prototype); return properties ? assign(result, properties) : result; } /** * Assigns own enumerable properties of source object(s) to the destination * object for all destination properties that resolve to `undefined`. Once a * property is set, additional defaults of the same property will be ignored. * * @static * @memberOf _ * @type Function * @category Objects * @param {Object} object The destination object. * @param {...Object} [source] The source objects. * @param- {Object} [guard] Allows working with `_.reduce` without using its * `key` and `object` arguments as sources. * @returns {Object} Returns the destination object. * @example * * var object = { 'name': 'barney' }; * _.defaults(object, { 'name': 'fred', 'employer': 'slate' }); * // => { 'name': 'barney', 'employer': 'slate' } */ var defaults = function(object, source, guard) { var index, iterable = object, result = iterable; if (!iterable) return result; var args = arguments, argsIndex = 0, argsLength = typeof guard == 'number' ? 2 : args.length; while (++argsIndex < argsLength) { iterable = args[argsIndex]; if (iterable && objectTypes[typeof iterable]) { var ownIndex = -1, ownProps = objectTypes[typeof iterable] && keys(iterable), length = ownProps ? ownProps.length : 0; while (++ownIndex < length) { index = ownProps[ownIndex]; if (typeof result[index] == 'undefined') result[index] = iterable[index]; } } } return result }; /** * This method is like `_.findIndex` except that it returns the key of the * first element that passes the callback check, instead of the element itself. * * If a property name is provided for `callback` the created "_.pluck" style * callback will return the property value of the given element. * * If an object is provided for `callback` the created "_.where" style callback * will return `true` for elements that have the properties of the given object, * else `false`. * * @static * @memberOf _ * @category Objects * @param {Object} object The object to search. * @param {Function|Object|string} [callback=identity] The function called per * iteration. If a property name or object is provided it will be used to * create a "_.pluck" or "_.where" style callback, respectively. * @param {*} [thisArg] The `this` binding of `callback`. * @returns {string|undefined} Returns the key of the found element, else `undefined`. * @example * * var characters = { * 'barney': { 'age': 36, 'blocked': false }, * 'fred': { 'age': 40, 'blocked': true }, * 'pebbles': { 'age': 1, 'blocked': false } * }; * * _.findKey(characters, function(chr) { * return chr.age < 40; * }); * // => 'barney' (property order is not guaranteed across environments) * * // using "_.where" callback shorthand * _.findKey(characters, { 'age': 1 }); * // => 'pebbles' * * // using "_.pluck" callback shorthand * _.findKey(characters, 'blocked'); * // => 'fred' */ function findKey(object, callback, thisArg) { var result; callback = lodash.createCallback(callback, thisArg, 3); forOwn(object, function(value, key, object) { if (callback(value, key, object)) { result = key; return false; } }); return result; } /** * This method is like `_.findKey` except that it iterates over elements * of a `collection` in the opposite order. * * If a property name is provided for `callback` the created "_.pluck" style * callback will return the property value of the given element. * * If an object is provided for `callback` the created "_.where" style callback * will return `true` for elements that have the properties of the given object, * else `false`. * * @static * @memberOf _ * @category Objects * @param {Object} object The object to search. * @param {Function|Object|string} [callback=identity] The function called per * iteration. If a property name or object is provided it will be used to * create a "_.pluck" or "_.where" style callback, respectively. * @param {*} [thisArg] The `this` binding of `callback`. * @returns {string|undefined} Returns the key of the found element, else `undefined`. * @example * * var characters = { * 'barney': { 'age': 36, 'blocked': true }, * 'fred': { 'age': 40, 'blocked': false }, * 'pebbles': { 'age': 1, 'blocked': true } * }; * * _.findLastKey(characters, function(chr) { * return chr.age < 40; * }); * // => returns `pebbles`, assuming `_.findKey` returns `barney` * * // using "_.where" callback shorthand * _.findLastKey(characters, { 'age': 40 }); * // => 'fred' * * // using "_.pluck" callback shorthand * _.findLastKey(characters, 'blocked'); * // => 'pebbles' */ function findLastKey(object, callback, thisArg) { var result; callback = lodash.createCallback(callback, thisArg, 3); forOwnRight(object, function(value, key, object) { if (callback(value, key, object)) { result = key; return false; } }); return result; } /** * Iterates over own and inherited enumerable properties of an object, * executing the callback for each property. The callback is bound to `thisArg` * and invoked with three arguments; (value, key, object). Callbacks may exit * iteration early by explicitly returning `false`. * * @static * @memberOf _ * @type Function * @category Objects * @param {Object} object The object to iterate over. * @param {Function} [callback=identity] The function called per iteration. * @param {*} [thisArg] The `this` binding of `callback`. * @returns {Object} Returns `object`. * @example * * function Shape() { * this.x = 0; * this.y = 0; * } * * Shape.prototype.move = function(x, y) { * this.x += x; * this.y += y; * }; * * _.forIn(new Shape, function(value, key) { * console.log(key); * }); * // => logs 'x', 'y', and 'move' (property order is not guaranteed across environments) */ var forIn = function(collection, callback, thisArg) { var index, iterable = collection, result = iterable; if (!iterable) return result; if (!objectTypes[typeof iterable]) return result; callback = callback && typeof thisArg == 'undefined' ? callback : baseCreateCallback(callback, thisArg, 3); for (index in iterable) { if (callback(iterable[index], index, collection) === false) return result; } return result }; /** * This method is like `_.forIn` except that it iterates over elements * of a `collection` in the opposite order. * * @static * @memberOf _ * @category Objects * @param {Object} object The object to iterate over. * @param {Function} [callback=identity] The function called per iteration. * @param {*} [thisArg] The `this` binding of `callback`. * @returns {Object} Returns `object`. * @example * * function Shape() { * this.x = 0; * this.y = 0; * } * * Shape.prototype.move = function(x, y) { * this.x += x; * this.y += y; * }; * * _.forInRight(new Shape, function(value, key) { * console.log(key); * }); * // => logs 'move', 'y', and 'x' assuming `_.forIn ` logs 'x', 'y', and 'move' */ function forInRight(object, callback, thisArg) { var pairs = []; forIn(object, function(value, key) { pairs.push(key, value); }); var length = pairs.length; callback = baseCreateCallback(callback, thisArg, 3); while (length--) { if (callback(pairs[length--], pairs[length], object) === false) { break; } } return object; } /** * Iterates over own enumerable properties of an object, executing the callback * for each property. The callback is bound to `thisArg` and invoked with three * arguments; (value, key, object). Callbacks may exit iteration early by * explicitly returning `false`. * * @static * @memberOf _ * @type Function * @category Objects * @param {Object} object The object to iterate over. * @param {Function} [callback=identity] The function called per iteration. * @param {*} [thisArg] The `this` binding of `callback`. * @returns {Object} Returns `object`. * @example * * _.forOwn({ '0': 'zero', '1': 'one', 'length': 2 }, function(num, key) { * console.log(key); * }); * // => logs '0', '1', and 'length' (property order is not guaranteed across environments) */ var forOwn = function(collection, callback, thisArg) { var index, iterable = collection, result = iterable; if (!iterable) return result; if (!objectTypes[typeof iterable]) return result; callback = callback && typeof thisArg == 'undefined' ? callback : baseCreateCallback(callback, thisArg, 3); var ownIndex = -1, ownProps = objectTypes[typeof iterable] && keys(iterable), length = ownProps ? ownProps.length : 0; while (++ownIndex < length) { index = ownProps[ownIndex]; if (callback(iterable[index], index, collection) === false) return result; } return result }; /** * This method is like `_.forOwn` except that it iterates over elements * of a `collection` in the opposite order. * * @static * @memberOf _ * @category Objects * @param {Object} object The object to iterate over. * @param {Function} [callback=identity] The function called per iteration. * @param {*} [thisArg] The `this` binding of `callback`. * @returns {Object} Returns `object`. * @example * * _.forOwnRight({ '0': 'zero', '1': 'one', 'length': 2 }, function(num, key) { * console.log(key); * }); * // => logs 'length', '1', and '0' assuming `_.forOwn` logs '0', '1', and 'length' */ function forOwnRight(object, callback, thisArg) { var props = keys(object), length = props.length; callback = baseCreateCallback(callback, thisArg, 3); while (length--) { var key = props[length]; if (callback(object[key], key, object) === false) { break; } } return object; } /** * Creates a sorted array of property names of all enumerable properties, * own and inherited, of `object` that have function values. * * @static * @memberOf _ * @alias methods * @category Objects * @param {Object} object The object to inspect. * @returns {Array} Returns an array of property names that have function values. * @example * * _.functions(_); * // => ['all', 'any', 'bind', 'bindAll', 'clone', 'compact', 'compose', ...] */ function functions(object) { var result = []; forIn(object, function(value, key) { if (isFunction(value)) { result.push(key); } }); return result.sort(); } /** * Checks if the specified object `property` exists and is a direct property, * instead of an inherited property. * * @static * @memberOf _ * @category Objects * @param {Object} object The object to check. * @param {string} property The property to check for. * @returns {boolean} Returns `true` if key is a direct property, else `false`. * @example * * _.has({ 'a': 1, 'b': 2, 'c': 3 }, 'b'); * // => true */ function has(object, property) { return object ? hasOwnProperty.call(object, property) : false; } /** * Creates an object composed of the inverted keys and values of the given object. * * @static * @memberOf _ * @category Objects * @param {Object} object The object to invert. * @returns {Object} Returns the created inverted object. * @example * * _.invert({ 'first': 'fred', 'second': 'barney' }); * // => { 'fred': 'first', 'barney': 'second' } */ function invert(object) { var index = -1, props = keys(object), length = props.length, result = {}; while (++index < length) { var key = props[index]; result[object[key]] = key; } return result; } /** * Checks if `value` is a boolean value. * * @static * @memberOf _ * @category Objects * @param {*} value The value to check. * @returns {boolean} Returns `true` if the `value` is a boolean value, else `false`. * @example * * _.isBoolean(null); * // => false */ function isBoolean(value) { return value === true || value === false || value && typeof value == 'object' && toString.call(value) == boolClass || false; } /** * Checks if `value` is a date. * * @static * @memberOf _ * @category Objects * @param {*} value The value to check. * @returns {boolean} Returns `true` if the `value` is a date, else `false`. * @example * * _.isDate(new Date); * // => true */ function isDate(value) { return value && typeof value == 'object' && toString.call(value) == dateClass || false; } /** * Checks if `value` is a DOM element. * * @static * @memberOf _ * @category Objects * @param {*} value The value to check. * @returns {boolean} Returns `true` if the `value` is a DOM element, else `false`. * @example * * _.isElement(document.body); * // => true */ function isElement(value) { return value && value.nodeType === 1 || false; } /** * Checks if `value` is empty. Arrays, strings, or `arguments` objects with a * length of `0` and objects with no own enumerable properties are considered * "empty". * * @static * @memberOf _ * @category Objects * @param {Array|Object|string} value The value to inspect. * @returns {boolean} Returns `true` if the `value` is empty, else `false`. * @example * * _.isEmpty([1, 2, 3]); * // => false * * _.isEmpty({}); * // => true * * _.isEmpty(''); * // => true */ function isEmpty(value) { var result = true; if (!value) { return result; } var className = toString.call(value), length = value.length; if ((className == arrayClass || className == stringClass || className == argsClass ) || (className == objectClass && typeof length == 'number' && isFunction(value.splice))) { return !length; } forOwn(value, function() { return (result = false); }); return result; } /** * Performs a deep comparison between two values to determine if they are * equivalent to each other. If a callback is provided it will be executed * to compare values. If the callback returns `undefined` comparisons will * be handled by the method instead. The callback is bound to `thisArg` and * invoked with two arguments; (a, b). * * @static * @memberOf _ * @category Objects * @param {*} a The value to compare. * @param {*} b The other value to compare. * @param {Function} [callback] The function to customize comparing values. * @param {*} [thisArg] The `this` binding of `callback`. * @returns {boolean} Returns `true` if the values are equivalent, else `false`. * @example * * var object = { 'name': 'fred' }; * var copy = { 'name': 'fred' }; * * object == copy; * // => false * * _.isEqual(object, copy); * // => true * * var words = ['hello', 'goodbye']; * var otherWords = ['hi', 'goodbye']; * * _.isEqual(words, otherWords, function(a, b) { * var reGreet = /^(?:hello|hi)$/i, * aGreet = _.isString(a) && reGreet.test(a), * bGreet = _.isString(b) && reGreet.test(b); * * return (aGreet || bGreet) ? (aGreet == bGreet) : undefined; * }); * // => true */ function isEqual(a, b, callback, thisArg) { return baseIsEqual(a, b, typeof callback == 'function' && baseCreateCallback(callback, thisArg, 2)); } /** * Checks if `value` is, or can be coerced to, a finite number. * * Note: This is not the same as native `isFinite` which will return true for * booleans and empty strings. See http://es5.github.io/#x15.1.2.5. * * @static * @memberOf _ * @category Objects * @param {*} value The value to check. * @returns {boolean} Returns `true` if the `value` is finite, else `false`. * @example * * _.isFinite(-101); * // => true * * _.isFinite('10'); * // => true * * _.isFinite(true); * // => false * * _.isFinite(''); * // => false * * _.isFinite(Infinity); * // => false */ function isFinite(value) { return nativeIsFinite(value) && !nativeIsNaN(parseFloat(value)); } /** * Checks if `value` is a function. * * @static * @memberOf _ * @category Objects * @param {*} value The value to check. * @returns {boolean} Returns `true` if the `value` is a function, else `false`. * @example * * _.isFunction(_); * // => true */ function isFunction(value) { return typeof value == 'function'; } /** * Checks if `value` is the language type of Object. * (e.g. arrays, functions, objects, regexes, `new Number(0)`, and `new String('')`) * * @static * @memberOf _ * @category Objects * @param {*} value The value to check. * @returns {boolean} Returns `true` if the `value` is an object, else `false`. * @example * * _.isObject({}); * // => true * * _.isObject([1, 2, 3]); * // => true * * _.isObject(1); * // => false */ function isObject(value) { // check if the value is the ECMAScript language type of Object // http://es5.github.io/#x8 // and avoid a V8 bug // http://code.google.com/p/v8/issues/detail?id=2291 return !!(value && objectTypes[typeof value]); } /** * Checks if `value` is `NaN`. * * Note: This is not the same as native `isNaN` which will return `true` for * `undefined` and other non-numeric values. See http://es5.github.io/#x15.1.2.4. * * @static * @memberOf _ * @category Objects * @param {*} value The value to check. * @returns {boolean} Returns `true` if the `value` is `NaN`, else `false`. * @example * * _.isNaN(NaN); * // => true * * _.isNaN(new Number(NaN)); * // => true * * isNaN(undefined); * // => true * * _.isNaN(undefined); * // => false */ function isNaN(value) { // `NaN` as a primitive is the only value that is not equal to itself // (perform the [[Class]] check first to avoid errors with some host objects in IE) return isNumber(value) && value != +value; } /** * Checks if `value` is `null`. * * @static * @memberOf _ * @category Objects * @param {*} value The value to check. * @returns {boolean} Returns `true` if the `value` is `null`, else `false`. * @example * * _.isNull(null); * // => true * * _.isNull(undefined); * // => false */ function isNull(value) { return value === null; } /** * Checks if `value` is a number. * * Note: `NaN` is considered a number. See http://es5.github.io/#x8.5. * * @static * @memberOf _ * @category Objects * @param {*} value The value to check. * @returns {boolean} Returns `true` if the `value` is a number, else `false`. * @example * * _.isNumber(8.4 * 5); * // => true */ function isNumber(value) { return typeof value == 'number' || value && typeof value == 'object' && toString.call(value) == numberClass || false; } /** * Checks if `value` is an object created by the `Object` constructor. * * @static * @memberOf _ * @category Objects * @param {*} value The value to check. * @returns {boolean} Returns `true` if `value` is a plain object, else `false`. * @example * * function Shape() { * this.x = 0; * this.y = 0; * } * * _.isPlainObject(new Shape); * // => false * * _.isPlainObject([1, 2, 3]); * // => false * * _.isPlainObject({ 'x': 0, 'y': 0 }); * // => true */ var isPlainObject = function(value) { if (!(value && toString.call(value) == objectClass)) { return false; } var valueOf = value.valueOf, objProto = typeof valueOf == 'function' && (objProto = getPrototypeOf(valueOf)) && getPrototypeOf(objProto); return objProto ? (value == objProto || getPrototypeOf(value) == objProto) : shimIsPlainObject(value); }; /** * Checks if `value` is a regular expression. * * @static * @memberOf _ * @category Objects * @param {*} value The value to check. * @returns {boolean} Returns `true` if the `value` is a regular expression, else `false`. * @example * * _.isRegExp(/fred/); * // => true */ function isRegExp(value) { return value && typeof value == 'object' && toString.call(value) == regexpClass || false; } /** * Checks if `value` is a string. * * @static * @memberOf _ * @category Objects * @param {*} value The value to check. * @returns {boolean} Returns `true` if the `value` is a string, else `false`. * @example * * _.isString('fred'); * // => true */ function isString(value) { return typeof value == 'string' || value && typeof value == 'object' && toString.call(value) == stringClass || false; } /** * Checks if `value` is `undefined`. * * @static * @memberOf _ * @category Objects * @param {*} value The value to check. * @returns {boolean} Returns `true` if the `value` is `undefined`, else `false`. * @example * * _.isUndefined(void 0); * // => true */ function isUndefined(value) { return typeof value == 'undefined'; } /** * Recursively merges own enumerable properties of the source object(s), that * don't resolve to `undefined` into the destination object. Subsequent sources * will overwrite property assignments of previous sources. If a callback is * provided it will be executed to produce the merged values of the destination * and source properties. If the callback returns `undefined` merging will * be handled by the method instead. The callback is bound to `thisArg` and * invoked with two arguments; (objectValue, sourceValue). * * @static * @memberOf _ * @category Objects * @param {Object} object The destination object. * @param {...Object} [source] The source objects. * @param {Function} [callback] The function to customize merging properties. * @param {*} [thisArg] The `this` binding of `callback`. * @returns {Object} Returns the destination object. * @example * * var names = { * 'characters': [ * { 'name': 'barney' }, * { 'name': 'fred' } * ] * }; * * var ages = { * 'characters': [ * { 'age': 36 }, * { 'age': 40 } * ] * }; * * _.merge(names, ages); * // => { 'characters': [{ 'name': 'barney', 'age': 36 }, { 'name': 'fred', 'age': 40 }] } * * var food = { * 'fruits': ['apple'], * 'vegetables': ['beet'] * }; * * var otherFood = { * 'fruits': ['banana'], * 'vegetables': ['carrot'] * }; * * _.merge(food, otherFood, function(a, b) { * return _.isArray(a) ? a.concat(b) : undefined; * }); * // => { 'fruits': ['apple', 'banana'], 'vegetables': ['beet', 'carrot] } */ function merge(object) { var args = arguments, length = 2; if (!isObject(object)) { return object; } // allows working with `_.reduce` and `_.reduceRight` without using // their `index` and `collection` arguments if (typeof args[2] != 'number') { length = args.length; } if (length > 3 && typeof args[length - 2] == 'function') { var callback = baseCreateCallback(args[--length - 1], args[length--], 2); } else if (length > 2 && typeof args[length - 1] == 'function') { callback = args[--length]; } var sources = slice(arguments, 1, length), index = -1, stackA = getArray(), stackB = getArray(); while (++index < length) { baseMerge(object, sources[index], callback, stackA, stackB); } releaseArray(stackA); releaseArray(stackB); return object; } /** * Creates a shallow clone of `object` excluding the specified properties. * Property names may be specified as individual arguments or as arrays of * property names. If a callback is provided it will be executed for each * property of `object` omitting the properties the callback returns truey * for. The callback is bound to `thisArg` and invoked with three arguments; * (value, key, object). * * @static * @memberOf _ * @category Objects * @param {Object} object The source object. * @param {Function|...string|string[]} [callback] The properties to omit or the * function called per iteration. * @param {*} [thisArg] The `this` binding of `callback`. * @returns {Object} Returns an object without the omitted properties. * @example * * _.omit({ 'name': 'fred', 'age': 40 }, 'age'); * // => { 'name': 'fred' } * * _.omit({ 'name': 'fred', 'age': 40 }, function(value) { * return typeof value == 'number'; * }); * // => { 'name': 'fred' } */ function omit(object, callback, thisArg) { var result = {}; if (typeof callback != 'function') { var props = []; forIn(object, function(value, key) { props.push(key); }); props = baseDifference(props, baseFlatten(arguments, true, false, 1)); var index = -1, length = props.length; while (++index < length) { var key = props[index]; result[key] = object[key]; } } else { callback = lodash.createCallback(callback, thisArg, 3); forIn(object, function(value, key, object) { if (!callback(value, key, object)) { result[key] = value; } }); } return result; } /** * Creates a two dimensional array of an object's key-value pairs, * i.e. `[[key1, value1], [key2, value2]]`. * * @static * @memberOf _ * @category Objects * @param {Object} object The object to inspect. * @returns {Array} Returns new array of key-value pairs. * @example * * _.pairs({ 'barney': 36, 'fred': 40 }); * // => [['barney', 36], ['fred', 40]] (property order is not guaranteed across environments) */ function pairs(object) { var index = -1, props = keys(object), length = props.length, result = Array(length); while (++index < length) { var key = props[index]; result[index] = [key, object[key]]; } return result; } /** * Creates a shallow clone of `object` composed of the specified properties. * Property names may be specified as individual arguments or as arrays of * property names. If a callback is provided it will be executed for each * property of `object` picking the properties the callback returns truey * for. The callback is bound to `thisArg` and invoked with three arguments; * (value, key, object). * * @static * @memberOf _ * @category Objects * @param {Object} object The source object. * @param {Function|...string|string[]} [callback] The function called per * iteration or property names to pick, specified as individual property * names or arrays of property names. * @param {*} [thisArg] The `this` binding of `callback`. * @returns {Object} Returns an object composed of the picked properties. * @example * * _.pick({ 'name': 'fred', '_userid': 'fred1' }, 'name'); * // => { 'name': 'fred' } * * _.pick({ 'name': 'fred', '_userid': 'fred1' }, function(value, key) { * return key.charAt(0) != '_'; * }); * // => { 'name': 'fred' } */ function pick(object, callback, thisArg) { var result = {}; if (typeof callback != 'function') { var index = -1, props = baseFlatten(arguments, true, false, 1), length = isObject(object) ? props.length : 0; while (++index < length) { var key = props[index]; if (key in object) { result[key] = object[key]; } } } else { callback = lodash.createCallback(callback, thisArg, 3); forIn(object, function(value, key, object) { if (callback(value, key, object)) { result[key] = value; } }); } return result; } /** * An alternative to `_.reduce` this method transforms `object` to a new * `accumulator` object which is the result of running each of its elements * through a callback, with each callback execution potentially mutating * the `accumulator` object. The callback is bound to `thisArg` and invoked * with four arguments; (accumulator, value, key, object). Callbacks may exit * iteration early by explicitly returning `false`. * * @static * @memberOf _ * @category Objects * @param {Array|Object} object The object to iterate over. * @param {Function} [callback=identity] The function called per iteration. * @param {*} [accumulator] The custom accumulator value. * @param {*} [thisArg] The `this` binding of `callback`. * @returns {*} Returns the accumulated value. * @example * * var squares = _.transform([1, 2, 3, 4, 5, 6, 7, 8, 9, 10], function(result, num) { * num *= num; * if (num % 2) { * return result.push(num) < 3; * } * }); * // => [1, 9, 25] * * var mapped = _.transform({ 'a': 1, 'b': 2, 'c': 3 }, function(result, num, key) { * result[key] = num * 3; * }); * // => { 'a': 3, 'b': 6, 'c': 9 } */ function transform(object, callback, accumulator, thisArg) { var isArr = isArray(object); if (accumulator == null) { if (isArr) { accumulator = []; } else { var ctor = object && object.constructor, proto = ctor && ctor.prototype; accumulator = baseCreate(proto); } } if (callback) { callback = lodash.createCallback(callback, thisArg, 4); (isArr ? forEach : forOwn)(object, function(value, index, object) { return callback(accumulator, value, index, object); }); } return accumulator; } /** * Creates an array composed of the own enumerable property values of `object`. * * @static * @memberOf _ * @category Objects * @param {Object} object The object to inspect. * @returns {Array} Returns an array of property values. * @example * * _.values({ 'one': 1, 'two': 2, 'three': 3 }); * // => [1, 2, 3] (property order is not guaranteed across environments) */ function values(object) { var index = -1, props = keys(object), length = props.length, result = Array(length); while (++index < length) { result[index] = object[props[index]]; } return result; } /*--------------------------------------------------------------------------*/ /** * Creates an array of elements from the specified indexes, or keys, of the * `collection`. Indexes may be specified as individual arguments or as arrays * of indexes. * * @static * @memberOf _ * @category Collections * @param {Array|Object|string} collection The collection to iterate over. * @param {...(number|number[]|string|string[])} [index] The indexes of `collection` * to retrieve, specified as individual indexes or arrays of indexes. * @returns {Array} Returns a new array of elements corresponding to the * provided indexes. * @example * * _.at(['a', 'b', 'c', 'd', 'e'], [0, 2, 4]); * // => ['a', 'c', 'e'] * * _.at(['fred', 'barney', 'pebbles'], 0, 2); * // => ['fred', 'pebbles'] */ function at(collection) { var args = arguments, index = -1, props = baseFlatten(args, true, false, 1), length = (args[2] && args[2][args[1]] === collection) ? 1 : props.length, result = Array(length); while(++index < length) { result[index] = collection[props[index]]; } return result; } /** * Checks if a given value is present in a collection using strict equality * for comparisons, i.e. `===`. If `fromIndex` is negative, it is used as the * offset from the end of the collection. * * @static * @memberOf _ * @alias include * @category Collections * @param {Array|Object|string} collection The collection to iterate over. * @param {*} target The value to check for. * @param {number} [fromIndex=0] The index to search from. * @returns {boolean} Returns `true` if the `target` element is found, else `false`. * @example * * _.contains([1, 2, 3], 1); * // => true * * _.contains([1, 2, 3], 1, 2); * // => false * * _.contains({ 'name': 'fred', 'age': 40 }, 'fred'); * // => true * * _.contains('pebbles', 'eb'); * // => true */ function contains(collection, target, fromIndex) { var index = -1, indexOf = getIndexOf(), length = collection ? collection.length : 0, result = false; fromIndex = (fromIndex < 0 ? nativeMax(0, length + fromIndex) : fromIndex) || 0; if (isArray(collection)) { result = indexOf(collection, target, fromIndex) > -1; } else if (typeof length == 'number') { result = (isString(collection) ? collection.indexOf(target, fromIndex) : indexOf(collection, target, fromIndex)) > -1; } else { forOwn(collection, function(value) { if (++index >= fromIndex) { return !(result = value === target); } }); } return result; } /** * Creates an object composed of keys generated from the results of running * each element of `collection` through the callback. The corresponding value * of each key is the number of times the key was returned by the callback. * The callback is bound to `thisArg` and invoked with three arguments; * (value, index|key, collection). * * If a property name is provided for `callback` the created "_.pluck" style * callback will return the property value of the given element. * * If an object is provided for `callback` the created "_.where" style callback * will return `true` for elements that have the properties of the given object, * else `false`. * * @static * @memberOf _ * @category Collections * @param {Array|Object|string} collection The collection to iterate over. * @param {Function|Object|string} [callback=identity] The function called * per iteration. If a property name or object is provided it will be used * to create a "_.pluck" or "_.where" style callback, respectively. * @param {*} [thisArg] The `this` binding of `callback`. * @returns {Object} Returns the composed aggregate object. * @example * * _.countBy([4.3, 6.1, 6.4], function(num) { return Math.floor(num); }); * // => { '4': 1, '6': 2 } * * _.countBy([4.3, 6.1, 6.4], function(num) { return this.floor(num); }, Math); * // => { '4': 1, '6': 2 } * * _.countBy(['one', 'two', 'three'], 'length'); * // => { '3': 2, '5': 1 } */ var countBy = createAggregator(function(result, value, key) { (hasOwnProperty.call(result, key) ? result[key]++ : result[key] = 1); }); /** * Checks if the given callback returns truey value for **all** elements of * a collection. The callback is bound to `thisArg` and invoked with three * arguments; (value, index|key, collection). * * If a property name is provided for `callback` the created "_.pluck" style * callback will return the property value of the given element. * * If an object is provided for `callback` the created "_.where" style callback * will return `true` for elements that have the properties of the given object, * else `false`. * * @static * @memberOf _ * @alias all * @category Collections * @param {Array|Object|string} collection The collection to iterate over. * @param {Function|Object|string} [callback=identity] The function called * per iteration. If a property name or object is provided it will be used * to create a "_.pluck" or "_.where" style callback, respectively. * @param {*} [thisArg] The `this` binding of `callback`. * @returns {boolean} Returns `true` if all elements passed the callback check, * else `false`. * @example * * _.every([true, 1, null, 'yes']); * // => false * * var characters = [ * { 'name': 'barney', 'age': 36 }, * { 'name': 'fred', 'age': 40 } * ]; * * // using "_.pluck" callback shorthand * _.every(characters, 'age'); * // => true * * // using "_.where" callback shorthand * _.every(characters, { 'age': 36 }); * // => false */ function every(collection, callback, thisArg) { var result = true; callback = lodash.createCallback(callback, thisArg, 3); var index = -1, length = collection ? collection.length : 0; if (typeof length == 'number') { while (++index < length) { if (!(result = !!callback(collection[index], index, collection))) { break; } } } else { forOwn(collection, function(value, index, collection) { return (result = !!callback(value, index, collection)); }); } return result; } /** * Iterates over elements of a collection, returning an array of all elements * the callback returns truey for. The callback is bound to `thisArg` and * invoked with three arguments; (value, index|key, collection). * * If a property name is provided for `callback` the created "_.pluck" style * callback will return the property value of the given element. * * If an object is provided for `callback` the created "_.where" style callback * will return `true` for elements that have the properties of the given object, * else `false`. * * @static * @memberOf _ * @alias select * @category Collections * @param {Array|Object|string} collection The collection to iterate over. * @param {Function|Object|string} [callback=identity] The function called * per iteration. If a property name or object is provided it will be used * to create a "_.pluck" or "_.where" style callback, respectively. * @param {*} [thisArg] The `this` binding of `callback`. * @returns {Array} Returns a new array of elements that passed the callback check. * @example * * var evens = _.filter([1, 2, 3, 4, 5, 6], function(num) { return num % 2 == 0; }); * // => [2, 4, 6] * * var characters = [ * { 'name': 'barney', 'age': 36, 'blocked': false }, * { 'name': 'fred', 'age': 40, 'blocked': true } * ]; * * // using "_.pluck" callback shorthand * _.filter(characters, 'blocked'); * // => [{ 'name': 'fred', 'age': 40, 'blocked': true }] * * // using "_.where" callback shorthand * _.filter(characters, { 'age': 36 }); * // => [{ 'name': 'barney', 'age': 36, 'blocked': false }] */ function filter(collection, callback, thisArg) { var result = []; callback = lodash.createCallback(callback, thisArg, 3); var index = -1, length = collection ? collection.length : 0; if (typeof length == 'number') { while (++index < length) { var value = collection[index]; if (callback(value, index, collection)) { result.push(value); } } } else { forOwn(collection, function(value, index, collection) { if (callback(value, index, collection)) { result.push(value); } }); } return result; } /** * Iterates over elements of a collection, returning the first element that * the callback returns truey for. The callback is bound to `thisArg` and * invoked with three arguments; (value, index|key, collection). * * If a property name is provided for `callback` the created "_.pluck" style * callback will return the property value of the given element. * * If an object is provided for `callback` the created "_.where" style callback * will return `true` for elements that have the properties of the given object, * else `false`. * * @static * @memberOf _ * @alias detect, findWhere * @category Collections * @param {Array|Object|string} collection The collection to iterate over. * @param {Function|Object|string} [callback=identity] The function called * per iteration. If a property name or object is provided it will be used * to create a "_.pluck" or "_.where" style callback, respectively. * @param {*} [thisArg] The `this` binding of `callback`. * @returns {*} Returns the found element, else `undefined`. * @example * * var characters = [ * { 'name': 'barney', 'age': 36, 'blocked': false }, * { 'name': 'fred', 'age': 40, 'blocked': true }, * { 'name': 'pebbles', 'age': 1, 'blocked': false } * ]; * * _.find(characters, function(chr) { * return chr.age < 40; * }); * // => { 'name': 'barney', 'age': 36, 'blocked': false } * * // using "_.where" callback shorthand * _.find(characters, { 'age': 1 }); * // => { 'name': 'pebbles', 'age': 1, 'blocked': false } * * // using "_.pluck" callback shorthand * _.find(characters, 'blocked'); * // => { 'name': 'fred', 'age': 40, 'blocked': true } */ function find(collection, callback, thisArg) { callback = lodash.createCallback(callback, thisArg, 3); var index = -1, length = collection ? collection.length : 0; if (typeof length == 'number') { while (++index < length) { var value = collection[index]; if (callback(value, index, collection)) { return value; } } } else { var result; forOwn(collection, function(value, index, collection) { if (callback(value, index, collection)) { result = value; return false; } }); return result; } } /** * This method is like `_.find` except that it iterates over elements * of a `collection` from right to left. * * @static * @memberOf _ * @category Collections * @param {Array|Object|string} collection The collection to iterate over. * @param {Function|Object|string} [callback=identity] The function called * per iteration. If a property name or object is provided it will be used * to create a "_.pluck" or "_.where" style callback, respectively. * @param {*} [thisArg] The `this` binding of `callback`. * @returns {*} Returns the found element, else `undefined`. * @example * * _.findLast([1, 2, 3, 4], function(num) { * return num % 2 == 1; * }); * // => 3 */ function findLast(collection, callback, thisArg) { var result; callback = lodash.createCallback(callback, thisArg, 3); forEachRight(collection, function(value, index, collection) { if (callback(value, index, collection)) { result = value; return false; } }); return result; } /** * Iterates over elements of a collection, executing the callback for each * element. The callback is bound to `thisArg` and invoked with three arguments; * (value, index|key, collection). Callbacks may exit iteration early by * explicitly returning `false`. * * Note: As with other "Collections" methods, objects with a `length` property * are iterated like arrays. To avoid this behavior `_.forIn` or `_.forOwn` * may be used for object iteration. * * @static * @memberOf _ * @alias each * @category Collections * @param {Array|Object|string} collection The collection to iterate over. * @param {Function} [callback=identity] The function called per iteration. * @param {*} [thisArg] The `this` binding of `callback`. * @returns {Array|Object|string} Returns `collection`. * @example * * _([1, 2, 3]).forEach(function(num) { console.log(num); }).join(','); * // => logs each number and returns '1,2,3' * * _.forEach({ 'one': 1, 'two': 2, 'three': 3 }, function(num) { console.log(num); }); * // => logs each number and returns the object (property order is not guaranteed across environments) */ function forEach(collection, callback, thisArg) { var index = -1, length = collection ? collection.length : 0; callback = callback && typeof thisArg == 'undefined' ? callback : baseCreateCallback(callback, thisArg, 3); if (typeof length == 'number') { while (++index < length) { if (callback(collection[index], index, collection) === false) { break; } } } else { forOwn(collection, callback); } return collection; } /** * This method is like `_.forEach` except that it iterates over elements * of a `collection` from right to left. * * @static * @memberOf _ * @alias eachRight * @category Collections * @param {Array|Object|string} collection The collection to iterate over. * @param {Function} [callback=identity] The function called per iteration. * @param {*} [thisArg] The `this` binding of `callback`. * @returns {Array|Object|string} Returns `collection`. * @example * * _([1, 2, 3]).forEachRight(function(num) { console.log(num); }).join(','); * // => logs each number from right to left and returns '3,2,1' */ function forEachRight(collection, callback, thisArg) { var length = collection ? collection.length : 0; callback = callback && typeof thisArg == 'undefined' ? callback : baseCreateCallback(callback, thisArg, 3); if (typeof length == 'number') { while (length--) { if (callback(collection[length], length, collection) === false) { break; } } } else { var props = keys(collection); length = props.length; forOwn(collection, function(value, key, collection) { key = props ? props[--length] : --length; return callback(collection[key], key, collection); }); } return collection; } /** * Creates an object composed of keys generated from the results of running * each element of a collection through the callback. The corresponding value * of each key is an array of the elements responsible for generating the key. * The callback is bound to `thisArg` and invoked with three arguments; * (value, index|key, collection). * * If a property name is provided for `callback` the created "_.pluck" style * callback will return the property value of the given element. * * If an object is provided for `callback` the created "_.where" style callback * will return `true` for elements that have the properties of the given object, * else `false` * * @static * @memberOf _ * @category Collections * @param {Array|Object|string} collection The collection to iterate over. * @param {Function|Object|string} [callback=identity] The function called * per iteration. If a property name or object is provided it will be used * to create a "_.pluck" or "_.where" style callback, respectively. * @param {*} [thisArg] The `this` binding of `callback`. * @returns {Object} Returns the composed aggregate object. * @example * * _.groupBy([4.2, 6.1, 6.4], function(num) { return Math.floor(num); }); * // => { '4': [4.2], '6': [6.1, 6.4] } * * _.groupBy([4.2, 6.1, 6.4], function(num) { return this.floor(num); }, Math); * // => { '4': [4.2], '6': [6.1, 6.4] } * * // using "_.pluck" callback shorthand * _.groupBy(['one', 'two', 'three'], 'length'); * // => { '3': ['one', 'two'], '5': ['three'] } */ var groupBy = createAggregator(function(result, value, key) { (hasOwnProperty.call(result, key) ? result[key] : result[key] = []).push(value); }); /** * Creates an object composed of keys generated from the results of running * each element of the collection through the given callback. The corresponding * value of each key is the last element responsible for generating the key. * The callback is bound to `thisArg` and invoked with three arguments; * (value, index|key, collection). * * If a property name is provided for `callback` the created "_.pluck" style * callback will return the property value of the given element. * * If an object is provided for `callback` the created "_.where" style callback * will return `true` for elements that have the properties of the given object, * else `false`. * * @static * @memberOf _ * @category Collections * @param {Array|Object|string} collection The collection to iterate over. * @param {Function|Object|string} [callback=identity] The function called * per iteration. If a property name or object is provided it will be used * to create a "_.pluck" or "_.where" style callback, respectively. * @param {*} [thisArg] The `this` binding of `callback`. * @returns {Object} Returns the composed aggregate object. * @example * * var keys = [ * { 'dir': 'left', 'code': 97 }, * { 'dir': 'right', 'code': 100 } * ]; * * _.indexBy(keys, 'dir'); * // => { 'left': { 'dir': 'left', 'code': 97 }, 'right': { 'dir': 'right', 'code': 100 } } * * _.indexBy(keys, function(key) { return String.fromCharCode(key.code); }); * // => { 'a': { 'dir': 'left', 'code': 97 }, 'd': { 'dir': 'right', 'code': 100 } } * * _.indexBy(characters, function(key) { this.fromCharCode(key.code); }, String); * // => { 'a': { 'dir': 'left', 'code': 97 }, 'd': { 'dir': 'right', 'code': 100 } } */ var indexBy = createAggregator(function(result, value, key) { result[key] = value; }); /** * Invokes the method named by `methodName` on each element in the `collection` * returning an array of the results of each invoked method. Additional arguments * will be provided to each invoked method. If `methodName` is a function it * will be invoked for, and `this` bound to, each element in the `collection`. * * @static * @memberOf _ * @category Collections * @param {Array|Object|string} collection The collection to iterate over. * @param {Function|string} methodName The name of the method to invoke or * the function invoked per iteration. * @param {...*} [arg] Arguments to invoke the method with. * @returns {Array} Returns a new array of the results of each invoked method. * @example * * _.invoke([[5, 1, 7], [3, 2, 1]], 'sort'); * // => [[1, 5, 7], [1, 2, 3]] * * _.invoke([123, 456], String.prototype.split, ''); * // => [['1', '2', '3'], ['4', '5', '6']] */ function invoke(collection, methodName) { var args = slice(arguments, 2), index = -1, isFunc = typeof methodName == 'function', length = collection ? collection.length : 0, result = Array(typeof length == 'number' ? length : 0); forEach(collection, function(value) { result[++index] = (isFunc ? methodName : value[methodName]).apply(value, args); }); return result; } /** * Creates an array of values by running each element in the collection * through the callback. The callback is bound to `thisArg` and invoked with * three arguments; (value, index|key, collection). * * If a property name is provided for `callback` the created "_.pluck" style * callback will return the property value of the given element. * * If an object is provided for `callback` the created "_.where" style callback * will return `true` for elements that have the properties of the given object, * else `false`. * * @static * @memberOf _ * @alias collect * @category Collections * @param {Array|Object|string} collection The collection to iterate over. * @param {Function|Object|string} [callback=identity] The function called * per iteration. If a property name or object is provided it will be used * to create a "_.pluck" or "_.where" style callback, respectively. * @param {*} [thisArg] The `this` binding of `callback`. * @returns {Array} Returns a new array of the results of each `callback` execution. * @example * * _.map([1, 2, 3], function(num) { return num * 3; }); * // => [3, 6, 9] * * _.map({ 'one': 1, 'two': 2, 'three': 3 }, function(num) { return num * 3; }); * // => [3, 6, 9] (property order is not guaranteed across environments) * * var characters = [ * { 'name': 'barney', 'age': 36 }, * { 'name': 'fred', 'age': 40 } * ]; * * // using "_.pluck" callback shorthand * _.map(characters, 'name'); * // => ['barney', 'fred'] */ function map(collection, callback, thisArg) { var index = -1, length = collection ? collection.length : 0; callback = lodash.createCallback(callback, thisArg, 3); if (typeof length == 'number') { var result = Array(length); while (++index < length) { result[index] = callback(collection[index], index, collection); } } else { result = []; forOwn(collection, function(value, key, collection) { result[++index] = callback(value, key, collection); }); } return result; } /** * Retrieves the maximum value of a collection. If the collection is empty or * falsey `-Infinity` is returned. If a callback is provided it will be executed * for each value in the collection to generate the criterion by which the value * is ranked. The callback is bound to `thisArg` and invoked with three * arguments; (value, index, collection). * * If a property name is provided for `callback` the created "_.pluck" style * callback will return the property value of the given element. * * If an object is provided for `callback` the created "_.where" style callback * will return `true` for elements that have the properties of the given object, * else `false`. * * @static * @memberOf _ * @category Collections * @param {Array|Object|string} collection The collection to iterate over. * @param {Function|Object|string} [callback=identity] The function called * per iteration. If a property name or object is provided it will be used * to create a "_.pluck" or "_.where" style callback, respectively. * @param {*} [thisArg] The `this` binding of `callback`. * @returns {*} Returns the maximum value. * @example * * _.max([4, 2, 8, 6]); * // => 8 * * var characters = [ * { 'name': 'barney', 'age': 36 }, * { 'name': 'fred', 'age': 40 } * ]; * * _.max(characters, function(chr) { return chr.age; }); * // => { 'name': 'fred', 'age': 40 }; * * // using "_.pluck" callback shorthand * _.max(characters, 'age'); * // => { 'name': 'fred', 'age': 40 }; */ function max(collection, callback, thisArg) { var computed = -Infinity, result = computed; // allows working with functions like `_.map` without using // their `index` argument as a callback if (typeof callback != 'function' && thisArg && thisArg[callback] === collection) { callback = null; } if (callback == null && isArray(collection)) { var index = -1, length = collection.length; while (++index < length) { var value = collection[index]; if (value > result) { result = value; } } } else { callback = (callback == null && isString(collection)) ? charAtCallback : lodash.createCallback(callback, thisArg, 3); forEach(collection, function(value, index, collection) { var current = callback(value, index, collection); if (current > computed) { computed = current; result = value; } }); } return result; } /** * Retrieves the minimum value of a collection. If the collection is empty or * falsey `Infinity` is returned. If a callback is provided it will be executed * for each value in the collection to generate the criterion by which the value * is ranked. The callback is bound to `thisArg` and invoked with three * arguments; (value, index, collection). * * If a property name is provided for `callback` the created "_.pluck" style * callback will return the property value of the given element. * * If an object is provided for `callback` the created "_.where" style callback * will return `true` for elements that have the properties of the given object, * else `false`. * * @static * @memberOf _ * @category Collections * @param {Array|Object|string} collection The collection to iterate over. * @param {Function|Object|string} [callback=identity] The function called * per iteration. If a property name or object is provided it will be used * to create a "_.pluck" or "_.where" style callback, respectively. * @param {*} [thisArg] The `this` binding of `callback`. * @returns {*} Returns the minimum value. * @example * * _.min([4, 2, 8, 6]); * // => 2 * * var characters = [ * { 'name': 'barney', 'age': 36 }, * { 'name': 'fred', 'age': 40 } * ]; * * _.min(characters, function(chr) { return chr.age; }); * // => { 'name': 'barney', 'age': 36 }; * * // using "_.pluck" callback shorthand * _.min(characters, 'age'); * // => { 'name': 'barney', 'age': 36 }; */ function min(collection, callback, thisArg) { var computed = Infinity, result = computed; // allows working with functions like `_.map` without using // their `index` argument as a callback if (typeof callback != 'function' && thisArg && thisArg[callback] === collection) { callback = null; } if (callback == null && isArray(collection)) { var index = -1, length = collection.length; while (++index < length) { var value = collection[index]; if (value < result) { result = value; } } } else { callback = (callback == null && isString(collection)) ? charAtCallback : lodash.createCallback(callback, thisArg, 3); forEach(collection, function(value, index, collection) { var current = callback(value, index, collection); if (current < computed) { computed = current; result = value; } }); } return result; } /** * Retrieves the value of a specified property from all elements in the collection. * * @static * @memberOf _ * @type Function * @category Collections * @param {Array|Object|string} collection The collection to iterate over. * @param {string} property The property to pluck. * @returns {Array} Returns a new array of property values. * @example * * var characters = [ * { 'name': 'barney', 'age': 36 }, * { 'name': 'fred', 'age': 40 } * ]; * * _.pluck(characters, 'name'); * // => ['barney', 'fred'] */ function pluck(collection, property) { var index = -1, length = collection ? collection.length : 0; if (typeof length == 'number') { var result = Array(length); while (++index < length) { result[index] = collection[index][property]; } } return result || map(collection, property); } /** * Reduces a collection to a value which is the accumulated result of running * each element in the collection through the callback, where each successive * callback execution consumes the return value of the previous execution. If * `accumulator` is not provided the first element of the collection will be * used as the initial `accumulator` value. The callback is bound to `thisArg` * and invoked with four arguments; (accumulator, value, index|key, collection). * * @static * @memberOf _ * @alias foldl, inject * @category Collections * @param {Array|Object|string} collection The collection to iterate over. * @param {Function} [callback=identity] The function called per iteration. * @param {*} [accumulator] Initial value of the accumulator. * @param {*} [thisArg] The `this` binding of `callback`. * @returns {*} Returns the accumulated value. * @example * * var sum = _.reduce([1, 2, 3], function(sum, num) { * return sum + num; * }); * // => 6 * * var mapped = _.reduce({ 'a': 1, 'b': 2, 'c': 3 }, function(result, num, key) { * result[key] = num * 3; * return result; * }, {}); * // => { 'a': 3, 'b': 6, 'c': 9 } */ function reduce(collection, callback, accumulator, thisArg) { if (!collection) return accumulator; var noaccum = arguments.length < 3; callback = lodash.createCallback(callback, thisArg, 4); var index = -1, length = collection.length; if (typeof length == 'number') { if (noaccum) { accumulator = collection[++index]; } while (++index < length) { accumulator = callback(accumulator, collection[index], index, collection); } } else { forOwn(collection, function(value, index, collection) { accumulator = noaccum ? (noaccum = false, value) : callback(accumulator, value, index, collection) }); } return accumulator; } /** * This method is like `_.reduce` except that it iterates over elements * of a `collection` from right to left. * * @static * @memberOf _ * @alias foldr * @category Collections * @param {Array|Object|string} collection The collection to iterate over. * @param {Function} [callback=identity] The function called per iteration. * @param {*} [accumulator] Initial value of the accumulator. * @param {*} [thisArg] The `this` binding of `callback`. * @returns {*} Returns the accumulated value. * @example * * var list = [[0, 1], [2, 3], [4, 5]]; * var flat = _.reduceRight(list, function(a, b) { return a.concat(b); }, []); * // => [4, 5, 2, 3, 0, 1] */ function reduceRight(collection, callback, accumulator, thisArg) { var noaccum = arguments.length < 3; callback = lodash.createCallback(callback, thisArg, 4); forEachRight(collection, function(value, index, collection) { accumulator = noaccum ? (noaccum = false, value) : callback(accumulator, value, index, collection); }); return accumulator; } /** * The opposite of `_.filter` this method returns the elements of a * collection that the callback does **not** return truey for. * * If a property name is provided for `callback` the created "_.pluck" style * callback will return the property value of the given element. * * If an object is provided for `callback` the created "_.where" style callback * will return `true` for elements that have the properties of the given object, * else `false`. * * @static * @memberOf _ * @category Collections * @param {Array|Object|string} collection The collection to iterate over. * @param {Function|Object|string} [callback=identity] The function called * per iteration. If a property name or object is provided it will be used * to create a "_.pluck" or "_.where" style callback, respectively. * @param {*} [thisArg] The `this` binding of `callback`. * @returns {Array} Returns a new array of elements that failed the callback check. * @example * * var odds = _.reject([1, 2, 3, 4, 5, 6], function(num) { return num % 2 == 0; }); * // => [1, 3, 5] * * var characters = [ * { 'name': 'barney', 'age': 36, 'blocked': false }, * { 'name': 'fred', 'age': 40, 'blocked': true } * ]; * * // using "_.pluck" callback shorthand * _.reject(characters, 'blocked'); * // => [{ 'name': 'barney', 'age': 36, 'blocked': false }] * * // using "_.where" callback shorthand * _.reject(characters, { 'age': 36 }); * // => [{ 'name': 'fred', 'age': 40, 'blocked': true }] */ function reject(collection, callback, thisArg) { callback = lodash.createCallback(callback, thisArg, 3); return filter(collection, function(value, index, collection) { return !callback(value, index, collection); }); } /** * Retrieves a random element or `n` random elements from a collection. * * @static * @memberOf _ * @category Collections * @param {Array|Object|string} collection The collection to sample. * @param {number} [n] The number of elements to sample. * @param- {Object} [guard] Allows working with functions like `_.map` * without using their `index` arguments as `n`. * @returns {Array} Returns the random sample(s) of `collection`. * @example * * _.sample([1, 2, 3, 4]); * // => 2 * * _.sample([1, 2, 3, 4], 2); * // => [3, 1] */ function sample(collection, n, guard) { if (collection && typeof collection.length != 'number') { collection = values(collection); } if (n == null || guard) { return collection ? collection[baseRandom(0, collection.length - 1)] : undefined; } var result = shuffle(collection); result.length = nativeMin(nativeMax(0, n), result.length); return result; } /** * Creates an array of shuffled values, using a version of the Fisher-Yates * shuffle. See http://en.wikipedia.org/wiki/Fisher-Yates_shuffle. * * @static * @memberOf _ * @category Collections * @param {Array|Object|string} collection The collection to shuffle. * @returns {Array} Returns a new shuffled collection. * @example * * _.shuffle([1, 2, 3, 4, 5, 6]); * // => [4, 1, 6, 3, 5, 2] */ function shuffle(collection) { var index = -1, length = collection ? collection.length : 0, result = Array(typeof length == 'number' ? length : 0); forEach(collection, function(value) { var rand = baseRandom(0, ++index); result[index] = result[rand]; result[rand] = value; }); return result; } /** * Gets the size of the `collection` by returning `collection.length` for arrays * and array-like objects or the number of own enumerable properties for objects. * * @static * @memberOf _ * @category Collections * @param {Array|Object|string} collection The collection to inspect. * @returns {number} Returns `collection.length` or number of own enumerable properties. * @example * * _.size([1, 2]); * // => 2 * * _.size({ 'one': 1, 'two': 2, 'three': 3 }); * // => 3 * * _.size('pebbles'); * // => 5 */ function size(collection) { var length = collection ? collection.length : 0; return typeof length == 'number' ? length : keys(collection).length; } /** * Checks if the callback returns a truey value for **any** element of a * collection. The function returns as soon as it finds a passing value and * does not iterate over the entire collection. The callback is bound to * `thisArg` and invoked with three arguments; (value, index|key, collection). * * If a property name is provided for `callback` the created "_.pluck" style * callback will return the property value of the given element. * * If an object is provided for `callback` the created "_.where" style callback * will return `true` for elements that have the properties of the given object, * else `false`. * * @static * @memberOf _ * @alias any * @category Collections * @param {Array|Object|string} collection The collection to iterate over. * @param {Function|Object|string} [callback=identity] The function called * per iteration. If a property name or object is provided it will be used * to create a "_.pluck" or "_.where" style callback, respectively. * @param {*} [thisArg] The `this` binding of `callback`. * @returns {boolean} Returns `true` if any element passed the callback check, * else `false`. * @example * * _.some([null, 0, 'yes', false], Boolean); * // => true * * var characters = [ * { 'name': 'barney', 'age': 36, 'blocked': false }, * { 'name': 'fred', 'age': 40, 'blocked': true } * ]; * * // using "_.pluck" callback shorthand * _.some(characters, 'blocked'); * // => true * * // using "_.where" callback shorthand * _.some(characters, { 'age': 1 }); * // => false */ function some(collection, callback, thisArg) { var result; callback = lodash.createCallback(callback, thisArg, 3); var index = -1, length = collection ? collection.length : 0; if (typeof length == 'number') { while (++index < length) { if ((result = callback(collection[index], index, collection))) { break; } } } else { forOwn(collection, function(value, index, collection) { return !(result = callback(value, index, collection)); }); } return !!result; } /** * Creates an array of elements, sorted in ascending order by the results of * running each element in a collection through the callback. This method * performs a stable sort, that is, it will preserve the original sort order * of equal elements. The callback is bound to `thisArg` and invoked with * three arguments; (value, index|key, collection). * * If a property name is provided for `callback` the created "_.pluck" style * callback will return the property value of the given element. * * If an object is provided for `callback` the created "_.where" style callback * will return `true` for elements that have the properties of the given object, * else `false`. * * @static * @memberOf _ * @category Collections * @param {Array|Object|string} collection The collection to iterate over. * @param {Function|Object|string} [callback=identity] The function called * per iteration. If a property name or object is provided it will be used * to create a "_.pluck" or "_.where" style callback, respectively. * @param {*} [thisArg] The `this` binding of `callback`. * @returns {Array} Returns a new array of sorted elements. * @example * * _.sortBy([1, 2, 3], function(num) { return Math.sin(num); }); * // => [3, 1, 2] * * _.sortBy([1, 2, 3], function(num) { return this.sin(num); }, Math); * // => [3, 1, 2] * * // using "_.pluck" callback shorthand * _.sortBy(['banana', 'strawberry', 'apple'], 'length'); * // => ['apple', 'banana', 'strawberry'] */ function sortBy(collection, callback, thisArg) { var index = -1, length = collection ? collection.length : 0, result = Array(typeof length == 'number' ? length : 0); callback = lodash.createCallback(callback, thisArg, 3); forEach(collection, function(value, key, collection) { var object = result[++index] = getObject(); object.criteria = callback(value, key, collection); object.index = index; object.value = value; }); length = result.length; result.sort(compareAscending); while (length--) { var object = result[length]; result[length] = object.value; releaseObject(object); } return result; } /** * Converts the `collection` to an array. * * @static * @memberOf _ * @category Collections * @param {Array|Object|string} collection The collection to convert. * @returns {Array} Returns the new converted array. * @example * * (function() { return _.toArray(arguments).slice(1); })(1, 2, 3, 4); * // => [2, 3, 4] */ function toArray(collection) { if (collection && typeof collection.length == 'number') { return slice(collection); } return values(collection); } /** * Performs a deep comparison of each element in a `collection` to the given * `properties` object, returning an array of all elements that have equivalent * property values. * * @static * @memberOf _ * @type Function * @category Collections * @param {Array|Object|string} collection The collection to iterate over. * @param {Object} properties The object of property values to filter by. * @returns {Array} Returns a new array of elements that have the given properties. * @example * * var characters = [ * { 'name': 'barney', 'age': 36, 'pets': ['hoppy'] }, * { 'name': 'fred', 'age': 40, 'pets': ['baby puss', 'dino'] } * ]; * * _.where(characters, { 'age': 36 }); * // => [{ 'name': 'barney', 'age': 36, 'pets': ['hoppy'] }] * * _.where(characters, { 'pets': ['dino'] }); * // => [{ 'name': 'fred', 'age': 40, 'pets': ['baby puss', 'dino'] }] */ var where = filter; /*--------------------------------------------------------------------------*/ /** * Creates an array with all falsey values removed. The values `false`, `null`, * `0`, `""`, `undefined`, and `NaN` are all falsey. * * @static * @memberOf _ * @category Arrays * @param {Array} array The array to compact. * @returns {Array} Returns a new array of filtered values. * @example * * _.compact([0, 1, false, 2, '', 3]); * // => [1, 2, 3] */ function compact(array) { var index = -1, length = array ? array.length : 0, result = []; while (++index < length) { var value = array[index]; if (value) { result.push(value); } } return result; } /** * Creates an array excluding all values of the provided arrays using strict * equality for comparisons, i.e. `===`. * * @static * @memberOf _ * @category Arrays * @param {Array} array The array to process. * @param {...Array} [values] The arrays of values to exclude. * @returns {Array} Returns a new array of filtered values. * @example * * _.difference([1, 2, 3, 4, 5], [5, 2, 10]); * // => [1, 3, 4] */ function difference(array) { return baseDifference(array, baseFlatten(arguments, true, true, 1)); } /** * This method is like `_.find` except that it returns the index of the first * element that passes the callback check, instead of the element itself. * * If a property name is provided for `callback` the created "_.pluck" style * callback will return the property value of the given element. * * If an object is provided for `callback` the created "_.where" style callback * will return `true` for elements that have the properties of the given object, * else `false`. * * @static * @memberOf _ * @category Arrays * @param {Array} array The array to search. * @param {Function|Object|string} [callback=identity] The function called * per iteration. If a property name or object is provided it will be used * to create a "_.pluck" or "_.where" style callback, respectively. * @param {*} [thisArg] The `this` binding of `callback`. * @returns {number} Returns the index of the found element, else `-1`. * @example * * var characters = [ * { 'name': 'barney', 'age': 36, 'blocked': false }, * { 'name': 'fred', 'age': 40, 'blocked': true }, * { 'name': 'pebbles', 'age': 1, 'blocked': false } * ]; * * _.findIndex(characters, function(chr) { * return chr.age < 20; * }); * // => 2 * * // using "_.where" callback shorthand * _.findIndex(characters, { 'age': 36 }); * // => 0 * * // using "_.pluck" callback shorthand * _.findIndex(characters, 'blocked'); * // => 1 */ function findIndex(array, callback, thisArg) { var index = -1, length = array ? array.length : 0; callback = lodash.createCallback(callback, thisArg, 3); while (++index < length) { if (callback(array[index], index, array)) { return index; } } return -1; } /** * This method is like `_.findIndex` except that it iterates over elements * of a `collection` from right to left. * * If a property name is provided for `callback` the created "_.pluck" style * callback will return the property value of the given element. * * If an object is provided for `callback` the created "_.where" style callback * will return `true` for elements that have the properties of the given object, * else `false`. * * @static * @memberOf _ * @category Arrays * @param {Array} array The array to search. * @param {Function|Object|string} [callback=identity] The function called * per iteration. If a property name or object is provided it will be used * to create a "_.pluck" or "_.where" style callback, respectively. * @param {*} [thisArg] The `this` binding of `callback`. * @returns {number} Returns the index of the found element, else `-1`. * @example * * var characters = [ * { 'name': 'barney', 'age': 36, 'blocked': true }, * { 'name': 'fred', 'age': 40, 'blocked': false }, * { 'name': 'pebbles', 'age': 1, 'blocked': true } * ]; * * _.findLastIndex(characters, function(chr) { * return chr.age > 30; * }); * // => 1 * * // using "_.where" callback shorthand * _.findLastIndex(characters, { 'age': 36 }); * // => 0 * * // using "_.pluck" callback shorthand * _.findLastIndex(characters, 'blocked'); * // => 2 */ function findLastIndex(array, callback, thisArg) { var length = array ? array.length : 0; callback = lodash.createCallback(callback, thisArg, 3); while (length--) { if (callback(array[length], length, array)) { return length; } } return -1; } /** * Gets the first element or first `n` elements of an array. If a callback * is provided elements at the beginning of the array are returned as long * as the callback returns truey. The callback is bound to `thisArg` and * invoked with three arguments; (value, index, array). * * If a property name is provided for `callback` the created "_.pluck" style * callback will return the property value of the given element. * * If an object is provided for `callback` the created "_.where" style callback * will return `true` for elements that have the properties of the given object, * else `false`. * * @static * @memberOf _ * @alias head, take * @category Arrays * @param {Array} array The array to query. * @param {Function|Object|number|string} [callback] The function called * per element or the number of elements to return. If a property name or * object is provided it will be used to create a "_.pluck" or "_.where" * style callback, respectively. * @param {*} [thisArg] The `this` binding of `callback`. * @returns {*} Returns the first element(s) of `array`. * @example * * _.first([1, 2, 3]); * // => 1 * * _.first([1, 2, 3], 2); * // => [1, 2] * * _.first([1, 2, 3], function(num) { * return num < 3; * }); * // => [1, 2] * * var characters = [ * { 'name': 'barney', 'blocked': true, 'employer': 'slate' }, * { 'name': 'fred', 'blocked': false, 'employer': 'slate' }, * { 'name': 'pebbles', 'blocked': true, 'employer': 'na' } * ]; * * // using "_.pluck" callback shorthand * _.first(characters, 'blocked'); * // => [{ 'name': 'barney', 'blocked': true, 'employer': 'slate' }] * * // using "_.where" callback shorthand * _.pluck(_.first(characters, { 'employer': 'slate' }), 'name'); * // => ['barney', 'fred'] */ function first(array, callback, thisArg) { var n = 0, length = array ? array.length : 0; if (typeof callback != 'number' && callback != null) { var index = -1; callback = lodash.createCallback(callback, thisArg, 3); while (++index < length && callback(array[index], index, array)) { n++; } } else { n = callback; if (n == null || thisArg) { return array ? array[0] : undefined; } } return slice(array, 0, nativeMin(nativeMax(0, n), length)); } /** * Flattens a nested array (the nesting can be to any depth). If `isShallow` * is truey, the array will only be flattened a single level. If a callback * is provided each element of the array is passed through the callback before * flattening. The callback is bound to `thisArg` and invoked with three * arguments; (value, index, array). * * If a property name is provided for `callback` the created "_.pluck" style * callback will return the property value of the given element. * * If an object is provided for `callback` the created "_.where" style callback * will return `true` for elements that have the properties of the given object, * else `false`. * * @static * @memberOf _ * @category Arrays * @param {Array} array The array to flatten. * @param {boolean} [isShallow=false] A flag to restrict flattening to a single level. * @param {Function|Object|string} [callback=identity] The function called * per iteration. If a property name or object is provided it will be used * to create a "_.pluck" or "_.where" style callback, respectively. * @param {*} [thisArg] The `this` binding of `callback`. * @returns {Array} Returns a new flattened array. * @example * * _.flatten([1, [2], [3, [[4]]]]); * // => [1, 2, 3, 4]; * * _.flatten([1, [2], [3, [[4]]]], true); * // => [1, 2, 3, [[4]]]; * * var characters = [ * { 'name': 'barney', 'age': 30, 'pets': ['hoppy'] }, * { 'name': 'fred', 'age': 40, 'pets': ['baby puss', 'dino'] } * ]; * * // using "_.pluck" callback shorthand * _.flatten(characters, 'pets'); * // => ['hoppy', 'baby puss', 'dino'] */ function flatten(array, isShallow, callback, thisArg) { // juggle arguments if (typeof isShallow != 'boolean' && isShallow != null) { thisArg = callback; callback = (typeof isShallow != 'function' && thisArg && thisArg[isShallow] === array) ? null : isShallow; isShallow = false; } if (callback != null) { array = map(array, callback, thisArg); } return baseFlatten(array, isShallow); } /** * Gets the index at which the first occurrence of `value` is found using * strict equality for comparisons, i.e. `===`. If the array is already sorted * providing `true` for `fromIndex` will run a faster binary search. * * @static * @memberOf _ * @category Arrays * @param {Array} array The array to search. * @param {*} value The value to search for. * @param {boolean|number} [fromIndex=0] The index to search from or `true` * to perform a binary search on a sorted array. * @returns {number} Returns the index of the matched value or `-1`. * @example * * _.indexOf([1, 2, 3, 1, 2, 3], 2); * // => 1 * * _.indexOf([1, 2, 3, 1, 2, 3], 2, 3); * // => 4 * * _.indexOf([1, 1, 2, 2, 3, 3], 2, true); * // => 2 */ function indexOf(array, value, fromIndex) { if (typeof fromIndex == 'number') { var length = array ? array.length : 0; fromIndex = (fromIndex < 0 ? nativeMax(0, length + fromIndex) : fromIndex || 0); } else if (fromIndex) { var index = sortedIndex(array, value); return array[index] === value ? index : -1; } return baseIndexOf(array, value, fromIndex); } /** * Gets all but the last element or last `n` elements of an array. If a * callback is provided elements at the end of the array are excluded from * the result as long as the callback returns truey. The callback is bound * to `thisArg` and invoked with three arguments; (value, index, array). * * If a property name is provided for `callback` the created "_.pluck" style * callback will return the property value of the given element. * * If an object is provided for `callback` the created "_.where" style callback * will return `true` for elements that have the properties of the given object, * else `false`. * * @static * @memberOf _ * @category Arrays * @param {Array} array The array to query. * @param {Function|Object|number|string} [callback=1] The function called * per element or the number of elements to exclude. If a property name or * object is provided it will be used to create a "_.pluck" or "_.where" * style callback, respectively. * @param {*} [thisArg] The `this` binding of `callback`. * @returns {Array} Returns a slice of `array`. * @example * * _.initial([1, 2, 3]); * // => [1, 2] * * _.initial([1, 2, 3], 2); * // => [1] * * _.initial([1, 2, 3], function(num) { * return num > 1; * }); * // => [1] * * var characters = [ * { 'name': 'barney', 'blocked': false, 'employer': 'slate' }, * { 'name': 'fred', 'blocked': true, 'employer': 'slate' }, * { 'name': 'pebbles', 'blocked': true, 'employer': 'na' } * ]; * * // using "_.pluck" callback shorthand * _.initial(characters, 'blocked'); * // => [{ 'name': 'barney', 'blocked': false, 'employer': 'slate' }] * * // using "_.where" callback shorthand * _.pluck(_.initial(characters, { 'employer': 'na' }), 'name'); * // => ['barney', 'fred'] */ function initial(array, callback, thisArg) { var n = 0, length = array ? array.length : 0; if (typeof callback != 'number' && callback != null) { var index = length; callback = lodash.createCallback(callback, thisArg, 3); while (index-- && callback(array[index], index, array)) { n++; } } else { n = (callback == null || thisArg) ? 1 : callback || n; } return slice(array, 0, nativeMin(nativeMax(0, length - n), length)); } /** * Creates an array of unique values present in all provided arrays using * strict equality for comparisons, i.e. `===`. * * @static * @memberOf _ * @category Arrays * @param {...Array} [array] The arrays to inspect. * @returns {Array} Returns an array of composite values. * @example * * _.intersection([1, 2, 3], [101, 2, 1, 10], [2, 1]); * // => [1, 2] */ function intersection(array) { var args = arguments, argsLength = args.length, argsIndex = -1, caches = getArray(), index = -1, indexOf = getIndexOf(), length = array ? array.length : 0, result = [], seen = getArray(); while (++argsIndex < argsLength) { var value = args[argsIndex]; caches[argsIndex] = indexOf === baseIndexOf && (value ? value.length : 0) >= largeArraySize && createCache(argsIndex ? args[argsIndex] : seen); } outer: while (++index < length) { var cache = caches[0]; value = array[index]; if ((cache ? cacheIndexOf(cache, value) : indexOf(seen, value)) < 0) { argsIndex = argsLength; (cache || seen).push(value); while (--argsIndex) { cache = caches[argsIndex]; if ((cache ? cacheIndexOf(cache, value) : indexOf(args[argsIndex], value)) < 0) { continue outer; } } result.push(value); } } while (argsLength--) { cache = caches[argsLength]; if (cache) { releaseObject(cache); } } releaseArray(caches); releaseArray(seen); return result; } /** * Gets the last element or last `n` elements of an array. If a callback is * provided elements at the end of the array are returned as long as the * callback returns truey. The callback is bound to `thisArg` and invoked * with three arguments; (value, index, array). * * If a property name is provided for `callback` the created "_.pluck" style * callback will return the property value of the given element. * * If an object is provided for `callback` the created "_.where" style callback * will return `true` for elements that have the properties of the given object, * else `false`. * * @static * @memberOf _ * @category Arrays * @param {Array} array The array to query. * @param {Function|Object|number|string} [callback] The function called * per element or the number of elements to return. If a property name or * object is provided it will be used to create a "_.pluck" or "_.where" * style callback, respectively. * @param {*} [thisArg] The `this` binding of `callback`. * @returns {*} Returns the last element(s) of `array`. * @example * * _.last([1, 2, 3]); * // => 3 * * _.last([1, 2, 3], 2); * // => [2, 3] * * _.last([1, 2, 3], function(num) { * return num > 1; * }); * // => [2, 3] * * var characters = [ * { 'name': 'barney', 'blocked': false, 'employer': 'slate' }, * { 'name': 'fred', 'blocked': true, 'employer': 'slate' }, * { 'name': 'pebbles', 'blocked': true, 'employer': 'na' } * ]; * * // using "_.pluck" callback shorthand * _.pluck(_.last(characters, 'blocked'), 'name'); * // => ['fred', 'pebbles'] * * // using "_.where" callback shorthand * _.last(characters, { 'employer': 'na' }); * // => [{ 'name': 'pebbles', 'blocked': true, 'employer': 'na' }] */ function last(array, callback, thisArg) { var n = 0, length = array ? array.length : 0; if (typeof callback != 'number' && callback != null) { var index = length; callback = lodash.createCallback(callback, thisArg, 3); while (index-- && callback(array[index], index, array)) { n++; } } else { n = callback; if (n == null || thisArg) { return array ? array[length - 1] : undefined; } } return slice(array, nativeMax(0, length - n)); } /** * Gets the index at which the last occurrence of `value` is found using strict * equality for comparisons, i.e. `===`. If `fromIndex` is negative, it is used * as the offset from the end of the collection. * * If a property name is provided for `callback` the created "_.pluck" style * callback will return the property value of the given element. * * If an object is provided for `callback` the created "_.where" style callback * will return `true` for elements that have the properties of the given object, * else `false`. * * @static * @memberOf _ * @category Arrays * @param {Array} array The array to search. * @param {*} value The value to search for. * @param {number} [fromIndex=array.length-1] The index to search from. * @returns {number} Returns the index of the matched value or `-1`. * @example * * _.lastIndexOf([1, 2, 3, 1, 2, 3], 2); * // => 4 * * _.lastIndexOf([1, 2, 3, 1, 2, 3], 2, 3); * // => 1 */ function lastIndexOf(array, value, fromIndex) { var index = array ? array.length : 0; if (typeof fromIndex == 'number') { index = (fromIndex < 0 ? nativeMax(0, index + fromIndex) : nativeMin(fromIndex, index - 1)) + 1; } while (index--) { if (array[index] === value) { return index; } } return -1; } /** * Removes all provided values from the given array using strict equality for * comparisons, i.e. `===`. * * @static * @memberOf _ * @category Arrays * @param {Array} array The array to modify. * @param {...*} [value] The values to remove. * @returns {Array} Returns `array`. * @example * * var array = [1, 2, 3, 1, 2, 3]; * _.pull(array, 2, 3); * console.log(array); * // => [1, 1] */ function pull(array) { var args = arguments, argsIndex = 0, argsLength = args.length, length = array ? array.length : 0; while (++argsIndex < argsLength) { var index = -1, value = args[argsIndex]; while (++index < length) { if (array[index] === value) { splice.call(array, index--, 1); length--; } } } return array; } /** * Creates an array of numbers (positive and/or negative) progressing from * `start` up to but not including `end`. If `start` is less than `stop` a * zero-length range is created unless a negative `step` is specified. * * @static * @memberOf _ * @category Arrays * @param {number} [start=0] The start of the range. * @param {number} end The end of the range. * @param {number} [step=1] The value to increment or decrement by. * @returns {Array} Returns a new range array. * @example * * _.range(4); * // => [0, 1, 2, 3] * * _.range(1, 5); * // => [1, 2, 3, 4] * * _.range(0, 20, 5); * // => [0, 5, 10, 15] * * _.range(0, -4, -1); * // => [0, -1, -2, -3] * * _.range(1, 4, 0); * // => [1, 1, 1] * * _.range(0); * // => [] */ function range(start, end, step) { start = +start || 0; step = typeof step == 'number' ? step : (+step || 1); if (end == null) { end = start; start = 0; } // use `Array(length)` so engines like Chakra and V8 avoid slower modes // http://youtu.be/XAqIpGU8ZZk#t=17m25s var index = -1, length = nativeMax(0, ceil((end - start) / (step || 1))), result = Array(length); while (++index < length) { result[index] = start; start += step; } return result; } /** * Removes all elements from an array that the callback returns truey for * and returns an array of removed elements. The callback is bound to `thisArg` * and invoked with three arguments; (value, index, array). * * If a property name is provided for `callback` the created "_.pluck" style * callback will return the property value of the given element. * * If an object is provided for `callback` the created "_.where" style callback * will return `true` for elements that have the properties of the given object, * else `false`. * * @static * @memberOf _ * @category Arrays * @param {Array} array The array to modify. * @param {Function|Object|string} [callback=identity] The function called * per iteration. If a property name or object is provided it will be used * to create a "_.pluck" or "_.where" style callback, respectively. * @param {*} [thisArg] The `this` binding of `callback`. * @returns {Array} Returns a new array of removed elements. * @example * * var array = [1, 2, 3, 4, 5, 6]; * var evens = _.remove(array, function(num) { return num % 2 == 0; }); * * console.log(array); * // => [1, 3, 5] * * console.log(evens); * // => [2, 4, 6] */ function remove(array, callback, thisArg) { var index = -1, length = array ? array.length : 0, result = []; callback = lodash.createCallback(callback, thisArg, 3); while (++index < length) { var value = array[index]; if (callback(value, index, array)) { result.push(value); splice.call(array, index--, 1); length--; } } return result; } /** * The opposite of `_.initial` this method gets all but the first element or * first `n` elements of an array. If a callback function is provided elements * at the beginning of the array are excluded from the result as long as the * callback returns truey. The callback is bound to `thisArg` and invoked * with three arguments; (value, index, array). * * If a property name is provided for `callback` the created "_.pluck" style * callback will return the property value of the given element. * * If an object is provided for `callback` the created "_.where" style callback * will return `true` for elements that have the properties of the given object, * else `false`. * * @static * @memberOf _ * @alias drop, tail * @category Arrays * @param {Array} array The array to query. * @param {Function|Object|number|string} [callback=1] The function called * per element or the number of elements to exclude. If a property name or * object is provided it will be used to create a "_.pluck" or "_.where" * style callback, respectively. * @param {*} [thisArg] The `this` binding of `callback`. * @returns {Array} Returns a slice of `array`. * @example * * _.rest([1, 2, 3]); * // => [2, 3] * * _.rest([1, 2, 3], 2); * // => [3] * * _.rest([1, 2, 3], function(num) { * return num < 3; * }); * // => [3] * * var characters = [ * { 'name': 'barney', 'blocked': true, 'employer': 'slate' }, * { 'name': 'fred', 'blocked': false, 'employer': 'slate' }, * { 'name': 'pebbles', 'blocked': true, 'employer': 'na' } * ]; * * // using "_.pluck" callback shorthand * _.pluck(_.rest(characters, 'blocked'), 'name'); * // => ['fred', 'pebbles'] * * // using "_.where" callback shorthand * _.rest(characters, { 'employer': 'slate' }); * // => [{ 'name': 'pebbles', 'blocked': true, 'employer': 'na' }] */ function rest(array, callback, thisArg) { if (typeof callback != 'number' && callback != null) { var n = 0, index = -1, length = array ? array.length : 0; callback = lodash.createCallback(callback, thisArg, 3); while (++index < length && callback(array[index], index, array)) { n++; } } else { n = (callback == null || thisArg) ? 1 : nativeMax(0, callback); } return slice(array, n); } /** * Uses a binary search to determine the smallest index at which a value * should be inserted into a given sorted array in order to maintain the sort * order of the array. If a callback is provided it will be executed for * `value` and each element of `array` to compute their sort ranking. The * callback is bound to `thisArg` and invoked with one argument; (value). * * If a property name is provided for `callback` the created "_.pluck" style * callback will return the property value of the given element. * * If an object is provided for `callback` the created "_.where" style callback * will return `true` for elements that have the properties of the given object, * else `false`. * * @static * @memberOf _ * @category Arrays * @param {Array} array The array to inspect. * @param {*} value The value to evaluate. * @param {Function|Object|string} [callback=identity] The function called * per iteration. If a property name or object is provided it will be used * to create a "_.pluck" or "_.where" style callback, respectively. * @param {*} [thisArg] The `this` binding of `callback`. * @returns {number} Returns the index at which `value` should be inserted * into `array`. * @example * * _.sortedIndex([20, 30, 50], 40); * // => 2 * * // using "_.pluck" callback shorthand * _.sortedIndex([{ 'x': 20 }, { 'x': 30 }, { 'x': 50 }], { 'x': 40 }, 'x'); * // => 2 * * var dict = { * 'wordToNumber': { 'twenty': 20, 'thirty': 30, 'fourty': 40, 'fifty': 50 } * }; * * _.sortedIndex(['twenty', 'thirty', 'fifty'], 'fourty', function(word) { * return dict.wordToNumber[word]; * }); * // => 2 * * _.sortedIndex(['twenty', 'thirty', 'fifty'], 'fourty', function(word) { * return this.wordToNumber[word]; * }, dict); * // => 2 */ function sortedIndex(array, value, callback, thisArg) { var low = 0, high = array ? array.length : low; // explicitly reference `identity` for better inlining in Firefox callback = callback ? lodash.createCallback(callback, thisArg, 1) : identity; value = callback(value); while (low < high) { var mid = (low + high) >>> 1; (callback(array[mid]) < value) ? low = mid + 1 : high = mid; } return low; } /** * Creates an array of unique values, in order, of the provided arrays using * strict equality for comparisons, i.e. `===`. * * @static * @memberOf _ * @category Arrays * @param {...Array} [array] The arrays to inspect. * @returns {Array} Returns an array of composite values. * @example * * _.union([1, 2, 3], [101, 2, 1, 10], [2, 1]); * // => [1, 2, 3, 101, 10] */ function union(array) { return baseUniq(baseFlatten(arguments, true, true)); } /** * Creates a duplicate-value-free version of an array using strict equality * for comparisons, i.e. `===`. If the array is sorted, providing * `true` for `isSorted` will use a faster algorithm. If a callback is provided * each element of `array` is passed through the callback before uniqueness * is computed. The callback is bound to `thisArg` and invoked with three * arguments; (value, index, array). * * If a property name is provided for `callback` the created "_.pluck" style * callback will return the property value of the given element. * * If an object is provided for `callback` the created "_.where" style callback * will return `true` for elements that have the properties of the given object, * else `false`. * * @static * @memberOf _ * @alias unique * @category Arrays * @param {Array} array The array to process. * @param {boolean} [isSorted=false] A flag to indicate that `array` is sorted. * @param {Function|Object|string} [callback=identity] The function called * per iteration. If a property name or object is provided it will be used * to create a "_.pluck" or "_.where" style callback, respectively. * @param {*} [thisArg] The `this` binding of `callback`. * @returns {Array} Returns a duplicate-value-free array. * @example * * _.uniq([1, 2, 1, 3, 1]); * // => [1, 2, 3] * * _.uniq([1, 1, 2, 2, 3], true); * // => [1, 2, 3] * * _.uniq(['A', 'b', 'C', 'a', 'B', 'c'], function(letter) { return letter.toLowerCase(); }); * // => ['A', 'b', 'C'] * * _.uniq([1, 2.5, 3, 1.5, 2, 3.5], function(num) { return this.floor(num); }, Math); * // => [1, 2.5, 3] * * // using "_.pluck" callback shorthand * _.uniq([{ 'x': 1 }, { 'x': 2 }, { 'x': 1 }], 'x'); * // => [{ 'x': 1 }, { 'x': 2 }] */ function uniq(array, isSorted, callback, thisArg) { // juggle arguments if (typeof isSorted != 'boolean' && isSorted != null) { thisArg = callback; callback = (typeof isSorted != 'function' && thisArg && thisArg[isSorted] === array) ? null : isSorted; isSorted = false; } if (callback != null) { callback = lodash.createCallback(callback, thisArg, 3); } return baseUniq(array, isSorted, callback); } /** * Creates an array excluding all provided values using strict equality for * comparisons, i.e. `===`. * * @static * @memberOf _ * @category Arrays * @param {Array} array The array to filter. * @param {...*} [value] The values to exclude. * @returns {Array} Returns a new array of filtered values. * @example * * _.without([1, 2, 1, 0, 3, 1, 4], 0, 1); * // => [2, 3, 4] */ function without(array) { return baseDifference(array, slice(arguments, 1)); } /** * Creates an array of grouped elements, the first of which contains the first * elements of the given arrays, the second of which contains the second * elements of the given arrays, and so on. * * @static * @memberOf _ * @alias unzip * @category Arrays * @param {...Array} [array] Arrays to process. * @returns {Array} Returns a new array of grouped elements. * @example * * _.zip(['fred', 'barney'], [30, 40], [true, false]); * // => [['fred', 30, true], ['barney', 40, false]] */ function zip() { var array = arguments.length > 1 ? arguments : arguments[0], index = -1, length = array ? max(pluck(array, 'length')) : 0, result = Array(length < 0 ? 0 : length); while (++index < length) { result[index] = pluck(array, index); } return result; } /** * Creates an object composed from arrays of `keys` and `values`. Provide * either a single two dimensional array, i.e. `[[key1, value1], [key2, value2]]` * or two arrays, one of `keys` and one of corresponding `values`. * * @static * @memberOf _ * @alias object * @category Arrays * @param {Array} keys The array of keys. * @param {Array} [values=[]] The array of values. * @returns {Object} Returns an object composed of the given keys and * corresponding values. * @example * * _.zipObject(['fred', 'barney'], [30, 40]); * // => { 'fred': 30, 'barney': 40 } */ function zipObject(keys, values) { var index = -1, length = keys ? keys.length : 0, result = {}; while (++index < length) { var key = keys[index]; if (values) { result[key] = values[index]; } else if (key) { result[key[0]] = key[1]; } } return result; } /*--------------------------------------------------------------------------*/ /** * Creates a function that executes `func`, with the `this` binding and * arguments of the created function, only after being called `n` times. * * @static * @memberOf _ * @category Functions * @param {number} n The number of times the function must be called before * `func` is executed. * @param {Function} func The function to restrict. * @returns {Function} Returns the new restricted function. * @example * * var saves = ['profile', 'settings']; * * var done = _.after(saves.length, function() { * console.log('Done saving!'); * }); * * _.forEach(saves, function(type) { * asyncSave({ 'type': type, 'complete': done }); * }); * // => logs 'Done saving!', after all saves have completed */ function after(n, func) { if (!isFunction(func)) { throw new TypeError; } return function() { if (--n < 1) { return func.apply(this, arguments); } }; } /** * Creates a function that, when called, invokes `func` with the `this` * binding of `thisArg` and prepends any additional `bind` arguments to those * provided to the bound function. * * @static * @memberOf _ * @category Functions * @param {Function} func The function to bind. * @param {*} [thisArg] The `this` binding of `func`. * @param {...*} [arg] Arguments to be partially applied. * @returns {Function} Returns the new bound function. * @example * * var func = function(greeting) { * return greeting + ' ' + this.name; * }; * * func = _.bind(func, { 'name': 'fred' }, 'hi'); * func(); * // => 'hi fred' */ function bind(func, thisArg) { return arguments.length > 2 ? createWrapper(func, 17, slice(arguments, 2), null, thisArg) : createWrapper(func, 1, null, null, thisArg); } /** * Binds methods of an object to the object itself, overwriting the existing * method. Method names may be specified as individual arguments or as arrays * of method names. If no method names are provided all the function properties * of `object` will be bound. * * @static * @memberOf _ * @category Functions * @param {Object} object The object to bind and assign the bound methods to. * @param {...string} [methodName] The object method names to * bind, specified as individual method names or arrays of method names. * @returns {Object} Returns `object`. * @example * * var view = { * 'label': 'docs', * 'onClick': function() { console.log('clicked ' + this.label); } * }; * * _.bindAll(view); * jQuery('#docs').on('click', view.onClick); * // => logs 'clicked docs', when the button is clicked */ function bindAll(object) { var funcs = arguments.length > 1 ? baseFlatten(arguments, true, false, 1) : functions(object), index = -1, length = funcs.length; while (++index < length) { var key = funcs[index]; object[key] = createWrapper(object[key], 1, null, null, object); } return object; } /** * Creates a function that, when called, invokes the method at `object[key]` * and prepends any additional `bindKey` arguments to those provided to the bound * function. This method differs from `_.bind` by allowing bound functions to * reference methods that will be redefined or don't yet exist. * See http://michaux.ca/articles/lazy-function-definition-pattern. * * @static * @memberOf _ * @category Functions * @param {Object} object The object the method belongs to. * @param {string} key The key of the method. * @param {...*} [arg] Arguments to be partially applied. * @returns {Function} Returns the new bound function. * @example * * var object = { * 'name': 'fred', * 'greet': function(greeting) { * return greeting + ' ' + this.name; * } * }; * * var func = _.bindKey(object, 'greet', 'hi'); * func(); * // => 'hi fred' * * object.greet = function(greeting) { * return greeting + 'ya ' + this.name + '!'; * }; * * func(); * // => 'hiya fred!' */ function bindKey(object, key) { return arguments.length > 2 ? createWrapper(key, 19, slice(arguments, 2), null, object) : createWrapper(key, 3, null, null, object); } /** * Creates a function that is the composition of the provided functions, * where each function consumes the return value of the function that follows. * For example, composing the functions `f()`, `g()`, and `h()` produces `f(g(h()))`. * Each function is executed with the `this` binding of the composed function. * * @static * @memberOf _ * @category Functions * @param {...Function} [func] Functions to compose. * @returns {Function} Returns the new composed function. * @example * * var realNameMap = { * 'pebbles': 'penelope' * }; * * var format = function(name) { * name = realNameMap[name.toLowerCase()] || name; * return name.charAt(0).toUpperCase() + name.slice(1).toLowerCase(); * }; * * var greet = function(formatted) { * return 'Hiya ' + formatted + '!'; * }; * * var welcome = _.compose(greet, format); * welcome('pebbles'); * // => 'Hiya Penelope!' */ function compose() { var funcs = arguments, length = funcs.length; while (length--) { if (!isFunction(funcs[length])) { throw new TypeError; } } return function() { var args = arguments, length = funcs.length; while (length--) { args = [funcs[length].apply(this, args)]; } return args[0]; }; } /** * Produces a callback bound to an optional `thisArg`. If `func` is a property * name the created callback will return the property value for a given element. * If `func` is an object the created callback will return `true` for elements * that contain the equivalent object properties, otherwise it will return `false`. * * @static * @memberOf _ * @category Functions * @param {*} [func=identity] The value to convert to a callback. * @param {*} [thisArg] The `this` binding of the created callback. * @param {number} [argCount] The number of arguments the callback accepts. * @returns {Function} Returns a callback function. * @example * * var characters = [ * { 'name': 'barney', 'age': 36 }, * { 'name': 'fred', 'age': 40 } * ]; * * // wrap to create custom callback shorthands * _.createCallback = _.wrap(_.createCallback, function(func, callback, thisArg) { * var match = /^(.+?)__([gl]t)(.+)$/.exec(callback); * return !match ? func(callback, thisArg) : function(object) { * return match[2] == 'gt' ? object[match[1]] > match[3] : object[match[1]] < match[3]; * }; * }); * * _.filter(characters, 'age__gt38'); * // => [{ 'name': 'fred', 'age': 40 }] */ function createCallback(func, thisArg, argCount) { var type = typeof func; if (func == null || type == 'function') { return baseCreateCallback(func, thisArg, argCount); } // handle "_.pluck" style callback shorthands if (type != 'object') { return function(object) { return object[func]; }; } var props = keys(func), key = props[0], a = func[key]; // handle "_.where" style callback shorthands if (props.length == 1 && a === a && !isObject(a)) { // fast path the common case of providing an object with a single // property containing a primitive value return function(object) { var b = object[key]; return a === b && (a !== 0 || (1 / a == 1 / b)); }; } return function(object) { var length = props.length, result = false; while (length--) { if (!(result = baseIsEqual(object[props[length]], func[props[length]], null, true))) { break; } } return result; }; } /** * Creates a function which accepts one or more arguments of `func` that when * invoked either executes `func` returning its result, if all `func` arguments * have been provided, or returns a function that accepts one or more of the * remaining `func` arguments, and so on. The arity of `func` can be specified * if `func.length` is not sufficient. * * @static * @memberOf _ * @category Functions * @param {Function} func The function to curry. * @param {number} [arity=func.length] The arity of `func`. * @returns {Function} Returns the new curried function. * @example * * var curried = _.curry(function(a, b, c) { * console.log(a + b + c); * }); * * curried(1)(2)(3); * // => 6 * * curried(1, 2)(3); * // => 6 * * curried(1, 2, 3); * // => 6 */ function curry(func, arity) { arity = typeof arity == 'number' ? arity : (+arity || func.length); return createWrapper(func, 4, null, null, null, arity); } /** * Creates a function that will delay the execution of `func` until after * `wait` milliseconds have elapsed since the last time it was invoked. * Provide an options object to indicate that `func` should be invoked on * the leading and/or trailing edge of the `wait` timeout. Subsequent calls * to the debounced function will return the result of the last `func` call. * * Note: If `leading` and `trailing` options are `true` `func` will be called * on the trailing edge of the timeout only if the the debounced function is * invoked more than once during the `wait` timeout. * * @static * @memberOf _ * @category Functions * @param {Function} func The function to debounce. * @param {number} wait The number of milliseconds to delay. * @param {Object} [options] The options object. * @param {boolean} [options.leading=false] Specify execution on the leading edge of the timeout. * @param {number} [options.maxWait] The maximum time `func` is allowed to be delayed before it's called. * @param {boolean} [options.trailing=true] Specify execution on the trailing edge of the timeout. * @returns {Function} Returns the new debounced function. * @example * * // avoid costly calculations while the window size is in flux * var lazyLayout = _.debounce(calculateLayout, 150); * jQuery(window).on('resize', lazyLayout); * * // execute `sendMail` when the click event is fired, debouncing subsequent calls * jQuery('#postbox').on('click', _.debounce(sendMail, 300, { * 'leading': true, * 'trailing': false * }); * * // ensure `batchLog` is executed once after 1 second of debounced calls * var source = new EventSource('/stream'); * source.addEventListener('message', _.debounce(batchLog, 250, { * 'maxWait': 1000 * }, false); */ function debounce(func, wait, options) { var args, maxTimeoutId, result, stamp, thisArg, timeoutId, trailingCall, lastCalled = 0, maxWait = false, trailing = true; if (!isFunction(func)) { throw new TypeError; } wait = nativeMax(0, wait) || 0; if (options === true) { var leading = true; trailing = false; } else if (isObject(options)) { leading = options.leading; maxWait = 'maxWait' in options && (nativeMax(wait, options.maxWait) || 0); trailing = 'trailing' in options ? options.trailing : trailing; } var delayed = function() { var remaining = wait - (now() - stamp); if (remaining <= 0) { if (maxTimeoutId) { clearTimeout(maxTimeoutId); } var isCalled = trailingCall; maxTimeoutId = timeoutId = trailingCall = undefined; if (isCalled) { lastCalled = now(); result = func.apply(thisArg, args); if (!timeoutId && !maxTimeoutId) { args = thisArg = null; } } } else { timeoutId = setTimeout(delayed, remaining); } }; var maxDelayed = function() { if (timeoutId) { clearTimeout(timeoutId); } maxTimeoutId = timeoutId = trailingCall = undefined; if (trailing || (maxWait !== wait)) { lastCalled = now(); result = func.apply(thisArg, args); if (!timeoutId && !maxTimeoutId) { args = thisArg = null; } } }; return function() { args = arguments; stamp = now(); thisArg = this; trailingCall = trailing && (timeoutId || !leading); if (maxWait === false) { var leadingCall = leading && !timeoutId; } else { if (!maxTimeoutId && !leading) { lastCalled = stamp; } var remaining = maxWait - (stamp - lastCalled), isCalled = remaining <= 0; if (isCalled) { if (maxTimeoutId) { maxTimeoutId = clearTimeout(maxTimeoutId); } lastCalled = stamp; result = func.apply(thisArg, args); } else if (!maxTimeoutId) { maxTimeoutId = setTimeout(maxDelayed, remaining); } } if (isCalled && timeoutId) { timeoutId = clearTimeout(timeoutId); } else if (!timeoutId && wait !== maxWait) { timeoutId = setTimeout(delayed, wait); } if (leadingCall) { isCalled = true; result = func.apply(thisArg, args); } if (isCalled && !timeoutId && !maxTimeoutId) { args = thisArg = null; } return result; }; } /** * Defers executing the `func` function until the current call stack has cleared. * Additional arguments will be provided to `func` when it is invoked. * * @static * @memberOf _ * @category Functions * @param {Function} func The function to defer. * @param {...*} [arg] Arguments to invoke the function with. * @returns {number} Returns the timer id. * @example * * _.defer(function() { console.log('deferred'); }); * // returns from the function before 'deferred' is logged */ function defer(func) { if (!isFunction(func)) { throw new TypeError; } var args = slice(arguments, 1); return setTimeout(function() { func.apply(undefined, args); }, 1); } // use `setImmediate` if available in Node.js if (setImmediate) { defer = function(func) { if (!isFunction(func)) { throw new TypeError; } return setImmediate.apply(context, arguments); }; } /** * Executes the `func` function after `wait` milliseconds. Additional arguments * will be provided to `func` when it is invoked. * * @static * @memberOf _ * @category Functions * @param {Function} func The function to delay. * @param {number} wait The number of milliseconds to delay execution. * @param {...*} [arg] Arguments to invoke the function with. * @returns {number} Returns the timer id. * @example * * var log = _.bind(console.log, console); * _.delay(log, 1000, 'logged later'); * // => 'logged later' (Appears after one second.) */ function delay(func, wait) { if (!isFunction(func)) { throw new TypeError; } var args = slice(arguments, 2); return setTimeout(function() { func.apply(undefined, args); }, wait); } /** * Creates a function that memoizes the result of `func`. If `resolver` is * provided it will be used to determine the cache key for storing the result * based on the arguments provided to the memoized function. By default, the * first argument provided to the memoized function is used as the cache key. * The `func` is executed with the `this` binding of the memoized function. * The result cache is exposed as the `cache` property on the memoized function. * * @static * @memberOf _ * @category Functions * @param {Function} func The function to have its output memoized. * @param {Function} [resolver] A function used to resolve the cache key. * @returns {Function} Returns the new memoizing function. * @example * * var fibonacci = _.memoize(function(n) { * return n < 2 ? n : fibonacci(n - 1) + fibonacci(n - 2); * }); * * fibonacci(9) * // => 34 * * var data = { * 'fred': { 'name': 'fred', 'age': 40 }, * 'pebbles': { 'name': 'pebbles', 'age': 1 } * }; * * // modifying the result cache * var get = _.memoize(function(name) { return data[name]; }, _.identity); * get('pebbles'); * // => { 'name': 'pebbles', 'age': 1 } * * get.cache.pebbles.name = 'penelope'; * get('pebbles'); * // => { 'name': 'penelope', 'age': 1 } */ function memoize(func, resolver) { if (!isFunction(func)) { throw new TypeError; } var memoized = function() { var cache = memoized.cache, key = resolver ? resolver.apply(this, arguments) : keyPrefix + arguments[0]; return hasOwnProperty.call(cache, key) ? cache[key] : (cache[key] = func.apply(this, arguments)); } memoized.cache = {}; return memoized; } /** * Creates a function that is restricted to execute `func` once. Repeat calls to * the function will return the value of the first call. The `func` is executed * with the `this` binding of the created function. * * @static * @memberOf _ * @category Functions * @param {Function} func The function to restrict. * @returns {Function} Returns the new restricted function. * @example * * var initialize = _.once(createApplication); * initialize(); * initialize(); * // `initialize` executes `createApplication` once */ function once(func) { var ran, result; if (!isFunction(func)) { throw new TypeError; } return function() { if (ran) { return result; } ran = true; result = func.apply(this, arguments); // clear the `func` variable so the function may be garbage collected func = null; return result; }; } /** * Creates a function that, when called, invokes `func` with any additional * `partial` arguments prepended to those provided to the new function. This * method is similar to `_.bind` except it does **not** alter the `this` binding. * * @static * @memberOf _ * @category Functions * @param {Function} func The function to partially apply arguments to. * @param {...*} [arg] Arguments to be partially applied. * @returns {Function} Returns the new partially applied function. * @example * * var greet = function(greeting, name) { return greeting + ' ' + name; }; * var hi = _.partial(greet, 'hi'); * hi('fred'); * // => 'hi fred' */ function partial(func) { return createWrapper(func, 16, slice(arguments, 1)); } /** * This method is like `_.partial` except that `partial` arguments are * appended to those provided to the new function. * * @static * @memberOf _ * @category Functions * @param {Function} func The function to partially apply arguments to. * @param {...*} [arg] Arguments to be partially applied. * @returns {Function} Returns the new partially applied function. * @example * * var defaultsDeep = _.partialRight(_.merge, _.defaults); * * var options = { * 'variable': 'data', * 'imports': { 'jq': $ } * }; * * defaultsDeep(options, _.templateSettings); * * options.variable * // => 'data' * * options.imports * // => { '_': _, 'jq': $ } */ function partialRight(func) { return createWrapper(func, 32, null, slice(arguments, 1)); } /** * Creates a function that, when executed, will only call the `func` function * at most once per every `wait` milliseconds. Provide an options object to * indicate that `func` should be invoked on the leading and/or trailing edge * of the `wait` timeout. Subsequent calls to the throttled function will * return the result of the last `func` call. * * Note: If `leading` and `trailing` options are `true` `func` will be called * on the trailing edge of the timeout only if the the throttled function is * invoked more than once during the `wait` timeout. * * @static * @memberOf _ * @category Functions * @param {Function} func The function to throttle. * @param {number} wait The number of milliseconds to throttle executions to. * @param {Object} [options] The options object. * @param {boolean} [options.leading=true] Specify execution on the leading edge of the timeout. * @param {boolean} [options.trailing=true] Specify execution on the trailing edge of the timeout. * @returns {Function} Returns the new throttled function. * @example * * // avoid excessively updating the position while scrolling * var throttled = _.throttle(updatePosition, 100); * jQuery(window).on('scroll', throttled); * * // execute `renewToken` when the click event is fired, but not more than once every 5 minutes * jQuery('.interactive').on('click', _.throttle(renewToken, 300000, { * 'trailing': false * })); */ function throttle(func, wait, options) { var leading = true, trailing = true; if (!isFunction(func)) { throw new TypeError; } if (options === false) { leading = false; } else if (isObject(options)) { leading = 'leading' in options ? options.leading : leading; trailing = 'trailing' in options ? options.trailing : trailing; } debounceOptions.leading = leading; debounceOptions.maxWait = wait; debounceOptions.trailing = trailing; return debounce(func, wait, debounceOptions); } /** * Creates a function that provides `value` to the wrapper function as its * first argument. Additional arguments provided to the function are appended * to those provided to the wrapper function. The wrapper is executed with * the `this` binding of the created function. * * @static * @memberOf _ * @category Functions * @param {*} value The value to wrap. * @param {Function} wrapper The wrapper function. * @returns {Function} Returns the new function. * @example * * var p = _.wrap(_.escape, function(func, text) { * return '<p>' + func(text) + '</p>'; * }); * * p('Fred, Wilma, & Pebbles'); * // => '<p>Fred, Wilma, & Pebbles</p>' */ function wrap(value, wrapper) { return createWrapper(wrapper, 16, [value]); } /*--------------------------------------------------------------------------*/ /** * Converts the characters `&`, `<`, `>`, `"`, and `'` in `string` to their * corresponding HTML entities. * * @static * @memberOf _ * @category Utilities * @param {string} string The string to escape. * @returns {string} Returns the escaped string. * @example * * _.escape('Fred, Wilma, & Pebbles'); * // => 'Fred, Wilma, & Pebbles' */ function escape(string) { return string == null ? '' : String(string).replace(reUnescapedHtml, escapeHtmlChar); } /** * This method returns the first argument provided to it. * * @static * @memberOf _ * @category Utilities * @param {*} value Any value. * @returns {*} Returns `value`. * @example * * var object = { 'name': 'fred' }; * _.identity(object) === object; * // => true */ function identity(value) { return value; } /** * Adds function properties of a source object to the `lodash` function and * chainable wrapper. * * @static * @memberOf _ * @category Utilities * @param {Object} object The object of function properties to add to `lodash`. * @param {Object} object The object of function properties to add to `lodash`. * @example * * _.mixin({ * 'capitalize': function(string) { * return string.charAt(0).toUpperCase() + string.slice(1).toLowerCase(); * } * }); * * _.capitalize('fred'); * // => 'Fred' * * _('fred').capitalize(); * // => 'Fred' */ function mixin(object, source) { var ctor = object, isFunc = !source || isFunction(ctor); if (!source) { ctor = lodashWrapper; source = object; object = lodash; } forEach(functions(source), function(methodName) { var func = object[methodName] = source[methodName]; if (isFunc) { ctor.prototype[methodName] = function() { var value = this.__wrapped__, args = [value]; push.apply(args, arguments); var result = func.apply(object, args); if (value && typeof value == 'object' && value === result) { return this; } result = new ctor(result); result.__chain__ = this.__chain__; return result; }; } }); } /** * Reverts the '_' variable to its previous value and returns a reference to * the `lodash` function. * * @static * @memberOf _ * @category Utilities * @returns {Function} Returns the `lodash` function. * @example * * var lodash = _.noConflict(); */ function noConflict() { context._ = oldDash; return this; } /** * A no-operation function. * * @static * @memberOf _ * @category Utilities * @example * * var object = { 'name': 'fred' }; * _.noop(object) === undefined; * // => true */ function noop() { // no operation performed } /** * Converts the given value into an integer of the specified radix. * If `radix` is `undefined` or `0` a `radix` of `10` is used unless the * `value` is a hexadecimal, in which case a `radix` of `16` is used. * * Note: This method avoids differences in native ES3 and ES5 `parseInt` * implementations. See http://es5.github.io/#E. * * @static * @memberOf _ * @category Utilities * @param {string} value The value to parse. * @param {number} [radix] The radix used to interpret the value to parse. * @returns {number} Returns the new integer value. * @example * * _.parseInt('08'); * // => 8 */ var parseInt = nativeParseInt(whitespace + '08') == 8 ? nativeParseInt : function(value, radix) { // Firefox < 21 and Opera < 15 follow the ES3 specified implementation of `parseInt` return nativeParseInt(isString(value) ? value.replace(reLeadingSpacesAndZeros, '') : value, radix || 0); }; /** * Produces a random number between `min` and `max` (inclusive). If only one * argument is provided a number between `0` and the given number will be * returned. If `floating` is truey or either `min` or `max` are floats a * floating-point number will be returned instead of an integer. * * @static * @memberOf _ * @category Utilities * @param {number} [min=0] The minimum possible value. * @param {number} [max=1] The maximum possible value. * @param {boolean} [floating=false] Specify returning a floating-point number. * @returns {number} Returns a random number. * @example * * _.random(0, 5); * // => an integer between 0 and 5 * * _.random(5); * // => also an integer between 0 and 5 * * _.random(5, true); * // => a floating-point number between 0 and 5 * * _.random(1.2, 5.2); * // => a floating-point number between 1.2 and 5.2 */ function random(min, max, floating) { var noMin = min == null, noMax = max == null; if (floating == null) { if (typeof min == 'boolean' && noMax) { floating = min; min = 1; } else if (!noMax && typeof max == 'boolean') { floating = max; noMax = true; } } if (noMin && noMax) { max = 1; } min = +min || 0; if (noMax) { max = min; min = 0; } else { max = +max || 0; } if (floating || min % 1 || max % 1) { var rand = nativeRandom(); return nativeMin(min + (rand * (max - min + parseFloat('1e-' + ((rand +'').length - 1)))), max); } return baseRandom(min, max); } /** * Resolves the value of `property` on `object`. If `property` is a function * it will be invoked with the `this` binding of `object` and its result returned, * else the property value is returned. If `object` is falsey then `undefined` * is returned. * * @static * @memberOf _ * @category Utilities * @param {Object} object The object to inspect. * @param {string} property The property to get the value of. * @returns {*} Returns the resolved value. * @example * * var object = { * 'cheese': 'crumpets', * 'stuff': function() { * return 'nonsense'; * } * }; * * _.result(object, 'cheese'); * // => 'crumpets' * * _.result(object, 'stuff'); * // => 'nonsense' */ function result(object, property) { if (object) { var value = object[property]; return isFunction(value) ? object[property]() : value; } } /** * A micro-templating method that handles arbitrary delimiters, preserves * whitespace, and correctly escapes quotes within interpolated code. * * Note: In the development build, `_.template` utilizes sourceURLs for easier * debugging. See http://www.html5rocks.com/en/tutorials/developertools/sourcemaps/#toc-sourceurl * * For more information on precompiling templates see: * http://lodash.com/custom-builds * * For more information on Chrome extension sandboxes see: * http://developer.chrome.com/stable/extensions/sandboxingEval.html * * @static * @memberOf _ * @category Utilities * @param {string} text The template text. * @param {Object} data The data object used to populate the text. * @param {Object} [options] The options object. * @param {RegExp} [options.escape] The "escape" delimiter. * @param {RegExp} [options.evaluate] The "evaluate" delimiter. * @param {Object} [options.imports] An object to import into the template as local variables. * @param {RegExp} [options.interpolate] The "interpolate" delimiter. * @param {string} [sourceURL] The sourceURL of the template's compiled source. * @param {string} [variable] The data object variable name. * @returns {Function|string} Returns a compiled function when no `data` object * is given, else it returns the interpolated text. * @example * * // using the "interpolate" delimiter to create a compiled template * var compiled = _.template('hello <%= name %>'); * compiled({ 'name': 'fred' }); * // => 'hello fred' * * // using the "escape" delimiter to escape HTML in data property values * _.template('<b><%- value %></b>', { 'value': '<script>' }); * // => '<b><script></b>' * * // using the "evaluate" delimiter to generate HTML * var list = '<% _.forEach(people, function(name) { %><li><%- name %></li><% }); %>'; * _.template(list, { 'people': ['fred', 'barney'] }); * // => '<li>fred</li><li>barney</li>' * * // using the ES6 delimiter as an alternative to the default "interpolate" delimiter * _.template('hello ${ name }', { 'name': 'pebbles' }); * // => 'hello pebbles' * * // using the internal `print` function in "evaluate" delimiters * _.template('<% print("hello " + name); %>!', { 'name': 'barney' }); * // => 'hello barney!' * * // using a custom template delimiters * _.templateSettings = { * 'interpolate': /{{([\s\S]+?)}}/g * }; * * _.template('hello {{ name }}!', { 'name': 'mustache' }); * // => 'hello mustache!' * * // using the `imports` option to import jQuery * var list = '<% $.each(people, function(name) { %><li><%- name %></li><% }); %>'; * _.template(list, { 'people': ['fred', 'barney'] }, { 'imports': { '$': jQuery } }); * // => '<li>fred</li><li>barney</li>' * * // using the `sourceURL` option to specify a custom sourceURL for the template * var compiled = _.template('hello <%= name %>', null, { 'sourceURL': '/basic/greeting.jst' }); * compiled(data); * // => find the source of "greeting.jst" under the Sources tab or Resources panel of the web inspector * * // using the `variable` option to ensure a with-statement isn't used in the compiled template * var compiled = _.template('hi <%= data.name %>!', null, { 'variable': 'data' }); * compiled.source; * // => function(data) { * var __t, __p = '', __e = _.escape; * __p += 'hi ' + ((__t = ( data.name )) == null ? '' : __t) + '!'; * return __p; * } * * // using the `source` property to inline compiled templates for meaningful * // line numbers in error messages and a stack trace * fs.writeFileSync(path.join(cwd, 'jst.js'), '\ * var JST = {\ * "main": ' + _.template(mainText).source + '\ * };\ * '); */ function template(text, data, options) { // based on John Resig's `tmpl` implementation // http://ejohn.org/blog/javascript-micro-templating/ // and Laura Doktorova's doT.js // https://github.com/olado/doT var settings = lodash.templateSettings; text = String(text || ''); // avoid missing dependencies when `iteratorTemplate` is not defined options = defaults({}, options, settings); var imports = defaults({}, options.imports, settings.imports), importsKeys = keys(imports), importsValues = values(imports); var isEvaluating, index = 0, interpolate = options.interpolate || reNoMatch, source = "__p += '"; // compile the regexp to match each delimiter var reDelimiters = RegExp( (options.escape || reNoMatch).source + '|' + interpolate.source + '|' + (interpolate === reInterpolate ? reEsTemplate : reNoMatch).source + '|' + (options.evaluate || reNoMatch).source + '|$' , 'g'); text.replace(reDelimiters, function(match, escapeValue, interpolateValue, esTemplateValue, evaluateValue, offset) { interpolateValue || (interpolateValue = esTemplateValue); // escape characters that cannot be included in string literals source += text.slice(index, offset).replace(reUnescapedString, escapeStringChar); // replace delimiters with snippets if (escapeValue) { source += "' +\n__e(" + escapeValue + ") +\n'"; } if (evaluateValue) { isEvaluating = true; source += "';\n" + evaluateValue + ";\n__p += '"; } if (interpolateValue) { source += "' +\n((__t = (" + interpolateValue + ")) == null ? '' : __t) +\n'"; } index = offset + match.length; // the JS engine embedded in Adobe products requires returning the `match` // string in order to produce the correct `offset` value return match; }); source += "';\n"; // if `variable` is not specified, wrap a with-statement around the generated // code to add the data object to the top of the scope chain var variable = options.variable, hasVariable = variable; if (!hasVariable) { variable = 'obj'; source = 'with (' + variable + ') {\n' + source + '\n}\n'; } // cleanup code by stripping empty strings source = (isEvaluating ? source.replace(reEmptyStringLeading, '') : source) .replace(reEmptyStringMiddle, '$1') .replace(reEmptyStringTrailing, '$1;'); // frame code as the function body source = 'function(' + variable + ') {\n' + (hasVariable ? '' : variable + ' || (' + variable + ' = {});\n') + "var __t, __p = '', __e = _.escape" + (isEvaluating ? ', __j = Array.prototype.join;\n' + "function print() { __p += __j.call(arguments, '') }\n" : ';\n' ) + source + 'return __p\n}'; // Use a sourceURL for easier debugging. // http://www.html5rocks.com/en/tutorials/developertools/sourcemaps/#toc-sourceurl var sourceURL = '\n/*\n//# sourceURL=' + (options.sourceURL || '/lodash/template/source[' + (templateCounter++) + ']') + '\n*/'; try { var result = Function(importsKeys, 'return ' + source + sourceURL).apply(undefined, importsValues); } catch(e) { e.source = source; throw e; } if (data) { return result(data); } // provide the compiled function's source by its `toString` method, in // supported environments, or the `source` property as a convenience for // inlining compiled templates during the build process result.source = source; return result; } /** * Executes the callback `n` times, returning an array of the results * of each callback execution. The callback is bound to `thisArg` and invoked * with one argument; (index). * * @static * @memberOf _ * @category Utilities * @param {number} n The number of times to execute the callback. * @param {Function} callback The function called per iteration. * @param {*} [thisArg] The `this` binding of `callback`. * @returns {Array} Returns an array of the results of each `callback` execution. * @example * * var diceRolls = _.times(3, _.partial(_.random, 1, 6)); * // => [3, 6, 4] * * _.times(3, function(n) { mage.castSpell(n); }); * // => calls `mage.castSpell(n)` three times, passing `n` of `0`, `1`, and `2` respectively * * _.times(3, function(n) { this.cast(n); }, mage); * // => also calls `mage.castSpell(n)` three times */ function times(n, callback, thisArg) { n = (n = +n) > -1 ? n : 0; var index = -1, result = Array(n); callback = baseCreateCallback(callback, thisArg, 1); while (++index < n) { result[index] = callback(index); } return result; } /** * The inverse of `_.escape` this method converts the HTML entities * `&`, `<`, `>`, `"`, and `'` in `string` to their * corresponding characters. * * @static * @memberOf _ * @category Utilities * @param {string} string The string to unescape. * @returns {string} Returns the unescaped string. * @example * * _.unescape('Fred, Barney & Pebbles'); * // => 'Fred, Barney & Pebbles' */ function unescape(string) { return string == null ? '' : String(string).replace(reEscapedHtml, unescapeHtmlChar); } /** * Generates a unique ID. If `prefix` is provided the ID will be appended to it. * * @static * @memberOf _ * @category Utilities * @param {string} [prefix] The value to prefix the ID with. * @returns {string} Returns the unique ID. * @example * * _.uniqueId('contact_'); * // => 'contact_104' * * _.uniqueId(); * // => '105' */ function uniqueId(prefix) { var id = ++idCounter; return String(prefix == null ? '' : prefix) + id; } /*--------------------------------------------------------------------------*/ /** * Creates a `lodash` object that wraps the given value with explicit * method chaining enabled. * * @static * @memberOf _ * @category Chaining * @param {*} value The value to wrap. * @returns {Object} Returns the wrapper object. * @example * * var characters = [ * { 'name': 'barney', 'age': 36 }, * { 'name': 'fred', 'age': 40 }, * { 'name': 'pebbles', 'age': 1 } * ]; * * var youngest = _.chain(characters) * .sortBy('age') * .map(function(chr) { return chr.name + ' is ' + chr.age; }) * .first() * .value(); * // => 'pebbles is 1' */ function chain(value) { value = new lodashWrapper(value); value.__chain__ = true; return value; } /** * Invokes `interceptor` with the `value` as the first argument and then * returns `value`. The purpose of this method is to "tap into" a method * chain in order to perform operations on intermediate results within * the chain. * * @static * @memberOf _ * @category Chaining * @param {*} value The value to provide to `interceptor`. * @param {Function} interceptor The function to invoke. * @returns {*} Returns `value`. * @example * * _([1, 2, 3, 4]) * .tap(function(array) { array.pop(); }) * .reverse() * .value(); * // => [3, 2, 1] */ function tap(value, interceptor) { interceptor(value); return value; } /** * Enables explicit method chaining on the wrapper object. * * @name chain * @memberOf _ * @category Chaining * @returns {*} Returns the wrapper object. * @example * * var characters = [ * { 'name': 'barney', 'age': 36 }, * { 'name': 'fred', 'age': 40 } * ]; * * // without explicit chaining * _(characters).first(); * // => { 'name': 'barney', 'age': 36 } * * // with explicit chaining * _(characters).chain() * .first() * .pick('age') * .value() * // => { 'age': 36 } */ function wrapperChain() { this.__chain__ = true; return this; } /** * Produces the `toString` result of the wrapped value. * * @name toString * @memberOf _ * @category Chaining * @returns {string} Returns the string result. * @example * * _([1, 2, 3]).toString(); * // => '1,2,3' */ function wrapperToString() { return String(this.__wrapped__); } /** * Extracts the wrapped value. * * @name valueOf * @memberOf _ * @alias value * @category Chaining * @returns {*} Returns the wrapped value. * @example * * _([1, 2, 3]).valueOf(); * // => [1, 2, 3] */ function wrapperValueOf() { return this.__wrapped__; } /*--------------------------------------------------------------------------*/ // add functions that return wrapped values when chaining lodash.after = after; lodash.assign = assign; lodash.at = at; lodash.bind = bind; lodash.bindAll = bindAll; lodash.bindKey = bindKey; lodash.chain = chain; lodash.compact = compact; lodash.compose = compose; lodash.countBy = countBy; lodash.create = create; lodash.createCallback = createCallback; lodash.curry = curry; lodash.debounce = debounce; lodash.defaults = defaults; lodash.defer = defer; lodash.delay = delay; lodash.difference = difference; lodash.filter = filter; lodash.flatten = flatten; lodash.forEach = forEach; lodash.forEachRight = forEachRight; lodash.forIn = forIn; lodash.forInRight = forInRight; lodash.forOwn = forOwn; lodash.forOwnRight = forOwnRight; lodash.functions = functions; lodash.groupBy = groupBy; lodash.indexBy = indexBy; lodash.initial = initial; lodash.intersection = intersection; lodash.invert = invert; lodash.invoke = invoke; lodash.keys = keys; lodash.map = map; lodash.max = max; lodash.memoize = memoize; lodash.merge = merge; lodash.min = min; lodash.omit = omit; lodash.once = once; lodash.pairs = pairs; lodash.partial = partial; lodash.partialRight = partialRight; lodash.pick = pick; lodash.pluck = pluck; lodash.pull = pull; lodash.range = range; lodash.reject = reject; lodash.remove = remove; lodash.rest = rest; lodash.shuffle = shuffle; lodash.sortBy = sortBy; lodash.tap = tap; lodash.throttle = throttle; lodash.times = times; lodash.toArray = toArray; lodash.transform = transform; lodash.union = union; lodash.uniq = uniq; lodash.values = values; lodash.where = where; lodash.without = without; lodash.wrap = wrap; lodash.zip = zip; lodash.zipObject = zipObject; // add aliases lodash.collect = map; lodash.drop = rest; lodash.each = forEach; lodash.eachRight = forEachRight; lodash.extend = assign; lodash.methods = functions; lodash.object = zipObject; lodash.select = filter; lodash.tail = rest; lodash.unique = uniq; lodash.unzip = zip; // add functions to `lodash.prototype` mixin(lodash); /*--------------------------------------------------------------------------*/ // add functions that return unwrapped values when chaining lodash.clone = clone; lodash.cloneDeep = cloneDeep; lodash.contains = contains; lodash.escape = escape; lodash.every = every; lodash.find = find; lodash.findIndex = findIndex; lodash.findKey = findKey; lodash.findLast = findLast; lodash.findLastIndex = findLastIndex; lodash.findLastKey = findLastKey; lodash.has = has; lodash.identity = identity; lodash.indexOf = indexOf; lodash.isArguments = isArguments; lodash.isArray = isArray; lodash.isBoolean = isBoolean; lodash.isDate = isDate; lodash.isElement = isElement; lodash.isEmpty = isEmpty; lodash.isEqual = isEqual; lodash.isFinite = isFinite; lodash.isFunction = isFunction; lodash.isNaN = isNaN; lodash.isNull = isNull; lodash.isNumber = isNumber; lodash.isObject = isObject; lodash.isPlainObject = isPlainObject; lodash.isRegExp = isRegExp; lodash.isString = isString; lodash.isUndefined = isUndefined; lodash.lastIndexOf = lastIndexOf; lodash.mixin = mixin; lodash.noConflict = noConflict; lodash.noop = noop; lodash.parseInt = parseInt; lodash.random = random; lodash.reduce = reduce; lodash.reduceRight = reduceRight; lodash.result = result; lodash.runInContext = runInContext; lodash.size = size; lodash.some = some; lodash.sortedIndex = sortedIndex; lodash.template = template; lodash.unescape = unescape; lodash.uniqueId = uniqueId; // add aliases lodash.all = every; lodash.any = some; lodash.detect = find; lodash.findWhere = find; lodash.foldl = reduce; lodash.foldr = reduceRight; lodash.include = contains; lodash.inject = reduce; forOwn(lodash, function(func, methodName) { if (!lodash.prototype[methodName]) { lodash.prototype[methodName] = function() { var args = [this.__wrapped__], chainAll = this.__chain__; push.apply(args, arguments); var result = func.apply(lodash, args); return chainAll ? new lodashWrapper(result, chainAll) : result; }; } }); /*--------------------------------------------------------------------------*/ // add functions capable of returning wrapped and unwrapped values when chaining lodash.first = first; lodash.last = last; lodash.sample = sample; // add aliases lodash.take = first; lodash.head = first; forOwn(lodash, function(func, methodName) { var callbackable = methodName !== 'sample'; if (!lodash.prototype[methodName]) { lodash.prototype[methodName]= function(n, guard) { var chainAll = this.__chain__, result = func(this.__wrapped__, n, guard); return !chainAll && (n == null || (guard && !(callbackable && typeof n == 'function'))) ? result : new lodashWrapper(result, chainAll); }; } }); /*--------------------------------------------------------------------------*/ /** * The semantic version number. * * @static * @memberOf _ * @type string */ lodash.VERSION = '2.3.0'; // add "Chaining" functions to the wrapper lodash.prototype.chain = wrapperChain; lodash.prototype.toString = wrapperToString; lodash.prototype.value = wrapperValueOf; lodash.prototype.valueOf = wrapperValueOf; // add `Array` functions that return unwrapped values forEach(['join', 'pop', 'shift'], function(methodName) { var func = arrayRef[methodName]; lodash.prototype[methodName] = function() { var chainAll = this.__chain__, result = func.apply(this.__wrapped__, arguments); return chainAll ? new lodashWrapper(result, chainAll) : result; }; }); // add `Array` functions that return the wrapped value forEach(['push', 'reverse', 'sort', 'unshift'], function(methodName) { var func = arrayRef[methodName]; lodash.prototype[methodName] = function() { func.apply(this.__wrapped__, arguments); return this; }; }); // add `Array` functions that return new wrapped values forEach(['concat', 'slice', 'splice'], function(methodName) { var func = arrayRef[methodName]; lodash.prototype[methodName] = function() { return new lodashWrapper(func.apply(this.__wrapped__, arguments), this.__chain__); }; }); return lodash; } /*--------------------------------------------------------------------------*/ // expose Lo-Dash var _ = runInContext(); // some AMD build optimizers like r.js check for condition patterns like the following: if (typeof define == 'function' && typeof define.amd == 'object' && define.amd) { // Expose Lo-Dash to the global object even when an AMD loader is present in // case Lo-Dash was injected by a third-party script and not intended to be // loaded as a module. The global assignment can be reverted in the Lo-Dash // module by its `noConflict()` method. root._ = _; // define as an anonymous module so, through path mapping, it can be // referenced as the "underscore" module define(function() { return _; }); } // check for `exports` after `define` in case a build optimizer adds an `exports` object else if (freeExports && freeModule) { // in Node.js or RingoJS if (moduleExports) { (freeModule.exports = _)._ = _; } // in Narwhal or Rhino -require else { freeExports._ = _; } } else { // in a browser or Rhino root._ = _; } }.call(this));