mapTo
New to transformation operators? Check out the article Get started transforming streams with map, pluck, and mapTo!
Example 1: Map every emission to string
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// RxJS v6+import { interval } from 'rxjs';import { mapTo } from 'rxjs/operators';//emit value every two secondsconst source = interval(2000);//map all emissions to one valueconst example = source.pipe(mapTo('HELLO WORLD!'));//output: 'HELLO WORLD!'...'HELLO WORLD!'...'HELLO WORLD!'...const subscribe = example.subscribe(val => console.log(val));
Example 2: Mapping clicks to string
( StackBlitz | jsBin | jsFiddle )
// RxJS v6+import { fromEvent } from 'rxjs';import { mapTo } from 'rxjs/operators';//emit every click on documentconst source = fromEvent(document, 'click');//map all emissions to one valueconst example = source.pipe(mapTo('GOODBYE WORLD!'));//output: (click)'GOODBYE WORLD!'...const subscribe = example.subscribe(val => console.log(val));
mapTo 📰 - Official docs
Changing behavior with mapTo
🎥 💵 - John Linquist
Transformation operator: map and mapTo
🎥 💵 - André Staltz
📁 Source Code: https://github.com/ReactiveX/rxjs/blob/master/src/internal/operators/mapTo.ts
Last updated 2 years ago