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Documentation Index

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Overview

Returns an Observable that skips all items emitted by the source Observable as long as a specified condition holds true, but emits all further source items as soon as the condition becomes false.

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Type Signature

function skipWhile<T>(
  predicate: (value: T, index: number) => boolean
): MonoTypeOperatorFunction<T>

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Parameters

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predicate
(value: T, index: number) => boolean
required
A function to test each item emitted from the source Observable. Once returns false, all subsequent values pass through.

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Returns

MonoTypeOperatorFunction<T> - A function that returns an Observable that begins emitting items when the predicate becomes false.

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Usage Examples

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Basic Example

import { from, skipWhile } from 'rxjs';

const source = from(['Green Arrow', 'SuperMan', 'Flash', 'SuperGirl', 'Black Canary']);
const example = source.pipe(skipWhile(hero => hero !== 'SuperGirl'));

example.subscribe(console.log);
// Output: SuperGirl, Black Canary
  • skip - Skips first N values
  • skipUntil - Skips until another Observable emits
  • takeWhile - Takes values while condition is true
  • filter - Filters all values by condition