///
module Rx {
export interface Observable {
/**
* Returns a new observable that triggers on the second and subsequent triggerings of the input observable.
* The Nth triggering of the input observable passes the arguments from the N-1th and Nth triggering as a pair.
* The argument passed to the N-1th triggering is held in hidden internal state until the Nth triggering occurs.
* @returns {Observable} An observable that triggers on successive pairs of observations from the input observable as an array.
*/
pairwise(): Observable<[T, T]>;
}
}
(function () {
var o : Rx.Observable;
var r : Rx.Observable<[number, number]>;
r = o.pairwise();
});