Repositorio del curso CCOM4030 el semestre B91 del proyecto Artesanías con el Instituto de Cultura

takeLast.d.ts 1.7KB

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  1. import { MonoTypeOperatorFunction } from '../types';
  2. /**
  3. * Emits only the last `count` values emitted by the source Observable.
  4. *
  5. * <span class="informal">Remembers the latest `count` values, then emits those
  6. * only when the source completes.</span>
  7. *
  8. * ![](takeLast.png)
  9. *
  10. * `takeLast` returns an Observable that emits at most the last `count` values
  11. * emitted by the source Observable. If the source emits fewer than `count`
  12. * values then all of its values are emitted. This operator must wait until the
  13. * `complete` notification emission from the source in order to emit the `next`
  14. * values on the output Observable, because otherwise it is impossible to know
  15. * whether or not more values will be emitted on the source. For this reason,
  16. * all values are emitted synchronously, followed by the complete notification.
  17. *
  18. * ## Example
  19. * Take the last 3 values of an Observable with many values
  20. * ```ts
  21. * import { range } from 'rxjs';
  22. * import { takeLast } from 'rxjs/operators';
  23. *
  24. * const many = range(1, 100);
  25. * const lastThree = many.pipe(takeLast(3));
  26. * lastThree.subscribe(x => console.log(x));
  27. * ```
  28. *
  29. * @see {@link take}
  30. * @see {@link takeUntil}
  31. * @see {@link takeWhile}
  32. * @see {@link skip}
  33. *
  34. * @throws {ArgumentOutOfRangeError} When using `takeLast(i)`, it delivers an
  35. * ArgumentOutOrRangeError to the Observer's `error` callback if `i < 0`.
  36. *
  37. * @param {number} count The maximum number of values to emit from the end of
  38. * the sequence of values emitted by the source Observable.
  39. * @return {Observable<T>} An Observable that emits at most the last count
  40. * values emitted by the source Observable.
  41. * @method takeLast
  42. * @owner Observable
  43. */
  44. export declare function takeLast<T>(count: number): MonoTypeOperatorFunction<T>;