work.suroh.tk/node_modules/rxjs/operator/take.js

40 lines
1.4 KiB
JavaScript

"use strict";
var take_1 = require('../operators/take');
/**
* Emits only the first `count` values emitted by the source Observable.
*
* <span class="informal">Takes the first `count` values from the source, then
* completes.</span>
*
* <img src="./img/take.png" width="100%">
*
* `take` returns an Observable that emits only the first `count` values emitted
* by the source Observable. If the source emits fewer than `count` values then
* all of its values are emitted. After that, it completes, regardless if the
* source completes.
*
* @example <caption>Take the first 5 seconds of an infinite 1-second interval Observable</caption>
* var interval = Rx.Observable.interval(1000);
* var five = interval.take(5);
* five.subscribe(x => console.log(x));
*
* @see {@link takeLast}
* @see {@link takeUntil}
* @see {@link takeWhile}
* @see {@link skip}
*
* @throws {ArgumentOutOfRangeError} When using `take(i)`, it delivers an
* ArgumentOutOrRangeError to the Observer's `error` callback if `i < 0`.
*
* @param {number} count The maximum number of `next` values to emit.
* @return {Observable<T>} An Observable that emits only the first `count`
* values emitted by the source Observable, or all of the values from the source
* if the source emits fewer than `count` values.
* @method take
* @owner Observable
*/
function take(count) {
return take_1.take(count)(this);
}
exports.take = take;
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