d2-ui
Version:
26 lines (22 loc) • 1.11 kB
text/typescript
/// <reference path="../../observable.ts" />
module Rx {
export interface Observable<T> {
/**
* Returns an observable sequence containing a value that represents how many elements in the specified observable sequence satisfy a condition if provided, else the count of items.
* @example
* res = source.count();
* res = source.count(function (x) { return x > 3; });
* @param {Function} [predicate]A function to test each element for a condition.
* @param {Any} [thisArg] Object to use as this when executing callback.
* @returns {Observable} An observable sequence containing a single element with a number that represents how many elements in the input sequence satisfy the condition in the predicate function if provided, else the count of items in the sequence.
*/
count(predicate?: _Predicate<T>, thisArg?: any): Observable<number>;
}
}
(function () {
var os : Rx.Observable<string>;
var on : Rx.Observable<number>;
on.count();
os.count((v, i, s) => false);
os.count((v, i, s) => true, {});
});