define(['../array/slice'], function(slice){ /** * Return a copy of the object, filtered to only have values for the whitelisted keys. */ function pick(obj, var_keys){ var keys = typeof arguments[1] !== 'string'? arguments[1] : slice(arguments, 1), out = {}, i = 0, key; while (key = keys[i++]) { out[key] = obj[key]; } return out; } return pick; });