work.suroh.tk/node_modules/rxjs/operators/take.d.ts

36 lines
1.4 KiB
TypeScript

import { MonoTypeOperatorFunction } from '../interfaces';
/**
* 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
*/
export declare function take<T>(count: number): MonoTypeOperatorFunction<T>;