every.md

every

signature: every(predicate: function, thisArg: any): Observable

If all values pass predicate before completion emit true, else false.

Examples

Example 1: Some values false

( jsBin | jsFiddle )

//emit 5 values
const source = Rx.Observable.of(1,2,3,4,5);
const example = source
  //is every value even?
  .every(val => val % 2 === 0)
//output: false
const subscribe = example.subscribe(val => console.log(val));

Example 2: All values true

( jsBin | jsFiddle )

//emit 5 values
const allEvens = Rx.Observable.of(2,4,6,8,10);
const example = allEvens
  //is every value even?
  .every(val => val % 2 === 0);
//output: true
const subscribe = example.subscribe(val => console.log(val));

Additional Resources

• every 📰 - Official docs

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📁 Source Code: https://github.com/ReactiveX/rxjs/blob/master/src/operator/every.ts