API / rxjs/operators

skipLast

Skip the last count values emitted by the source Observable.

skipLast<T>(count: number): MonoTypeOperatorFunction<T>

Parameters

count

Number of elements to skip from the end of the source Observable.

Returns

MonoTypeOperatorFunction<T>: An Observable that skips the last count values emitted by the source Observable.

Throws

ArgumentOutOfRangeError When using skipLast(i), it throws ArgumentOutOrRangeError if i < 0.

Description

skipLast returns an Observable that accumulates a queue with a length enough to store the first count values. As more values are received, values are taken from the front of the queue and produced on the result sequence. This causes values to be delayed.

Example

Skip the last 2 values of an Observable with many values

import { range } from 'rxjs'; import { skipLast } from 'rxjs/operators'; const many = range(1, 5); const skipLastTwo = many.pipe(skipLast(2)); skipLastTwo.subscribe(x => console.log(x)); // Results in: // 1 2 3

See Also