48 lines
1.5 KiB
TypeScript
48 lines
1.5 KiB
TypeScript
import { MonoTypeOperatorFunction } from '../types';
|
|
/**
|
|
* 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>
|
|
*
|
|
* 
|
|
*
|
|
* `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
|
|
* Take the first 5 seconds of an infinite 1-second interval Observable
|
|
* ```ts
|
|
* import { interval } from 'rxjs';
|
|
* import { take } from 'rxjs/operators';
|
|
*
|
|
* const intervalCount = interval(1000);
|
|
* const takeFive = intervalCount.pipe(take(5));
|
|
* takeFive.subscribe(x => console.log(x));
|
|
*
|
|
* // Logs:
|
|
* // 0
|
|
* // 1
|
|
* // 2
|
|
* // 3
|
|
* // 4
|
|
* ```
|
|
*
|
|
* @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>;
|