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- import { Observable } from '../Observable';
- import { Falsy, OperatorFunction } from '../types';
- import { operate } from '../util/lift';
- import { createOperatorSubscriber } from './OperatorSubscriber';
- export function every<T>(predicate: BooleanConstructor): OperatorFunction<T, Exclude<T, Falsy> extends never ? false : boolean>;
- /** @deprecated Use a closure instead of a `thisArg`. Signatures accepting a `thisArg` will be removed in v8. */
- export function every<T>(
- predicate: BooleanConstructor,
- thisArg: any
- ): OperatorFunction<T, Exclude<T, Falsy> extends never ? false : boolean>;
- /** @deprecated Use a closure instead of a `thisArg`. Signatures accepting a `thisArg` will be removed in v8. */
- export function every<T, A>(
- predicate: (this: A, value: T, index: number, source: Observable<T>) => boolean,
- thisArg: A
- ): OperatorFunction<T, boolean>;
- export function every<T>(predicate: (value: T, index: number, source: Observable<T>) => boolean): OperatorFunction<T, boolean>;
- /**
- * Returns an Observable that emits whether or not every item of the source satisfies the condition specified.
- *
- * <span class="informal">If all values pass predicate before the source completes, emits true before completion,
- * otherwise emit false, then complete.</span>
- *
- * 
- *
- * ## Example
- *
- * A simple example emitting true if all elements are less than 5, false otherwise
- *
- * ```ts
- * import { of, every } from 'rxjs';
- *
- * of(1, 2, 3, 4, 5, 6)
- * .pipe(every(x => x < 5))
- * .subscribe(x => console.log(x)); // -> false
- * ```
- *
- * @param predicate A function for determining if an item meets a specified condition.
- * @param thisArg Optional object to use for `this` in the callback.
- * @return A function that returns an Observable of booleans that determines if
- * all items of the source Observable meet the condition specified.
- */
- export function every<T>(
- predicate: (value: T, index: number, source: Observable<T>) => boolean,
- thisArg?: any
- ): OperatorFunction<T, boolean> {
- return operate((source, subscriber) => {
- let index = 0;
- source.subscribe(
- createOperatorSubscriber(
- subscriber,
- (value) => {
- if (!predicate.call(thisArg, value, index++, source)) {
- subscriber.next(false);
- subscriber.complete();
- }
- },
- () => {
- subscriber.next(true);
- subscriber.complete();
- }
- )
- );
- });
- }
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