Returns an Observable that emits whether or not every item of the source satisfies the condition specified.

every<T>(predicate: (value: T, index: number, source: Observable<T>) => boolean, thisArg?: any): OperatorFunction<T, boolean>

Parameters

predicate	(value: T, index: number, source: Observable<T>) => boolean	A function for determining if an item meets a specified condition.
thisArg	any	Optional. Default is undefined. Optional object to use for this in the callback.

Returns

OperatorFunction<T, boolean>: A function that returns an Observable of booleans that determines if all items of the source Observable meet the condition specified.

Description

If all values pass predicate before the source completes, emits true before completion, otherwise emit false, then complete.

Example

A simple example emitting true if all elements are less than 5, false otherwise

import { of, every } from 'rxjs';

of(1, 2, 3, 4, 5, 6)
  .pipe(every(x => x < 5))
  .subscribe(x => console.log(x)); // -> false

Overloads

every(predicate: BooleanConstructor): OperatorFunction<T, Exclude<T, Falsy> extends never ? false : boolean>

Parameters

predicate

BooleanConstructor

Returns

OperatorFunction<T, Exclude<T, Falsy> extends never ? false : boolean>

every(predicate: BooleanConstructor, thisArg: any): OperatorFunction<T, Exclude<T, Falsy> extends never ? false : boolean>

Parameters

predicate	BooleanConstructor
thisArg	any

Returns

OperatorFunction<T, Exclude<T, Falsy> extends never ? false : boolean>

every(predicate: (this: A, value: T, index: number, source: Observable<T>) => boolean, thisArg: A): OperatorFunction<T, boolean>

Parameters

predicate	(this: A, value: T, index: number, source: Observable<T>) => boolean
thisArg	A

Returns

OperatorFunction<T, boolean>

every(predicate: (value: T, index: number, source: Observable<T>) => boolean): OperatorFunction<T, boolean>

Parameters

predicate

(value: T, index: number, source: Observable<T>) => boolean

Returns

OperatorFunction<T, boolean>