throttleTime

signature: throttleTime(duration: number, scheduler: Scheduler): Observable

Emit latest value when specified duration has passed.

Examples

Example 1: Receieve latest value every 5 seconds

( jsBin | jsFiddle )

//emit value every 1 second
const source = Rx.Observable.interval(1000);
/*
  throttle for five seconds
  last value emitted before throttle ends will be emitted from source
*/
const example = source
  .throttleTime(5000);
//output: 0...6...12
const subscribe = example.subscribe(val => console.log(val));
Example 2: Throttle merged observable

( jsBin | jsFiddle )

const source = Rx.Observable
    .merge(
          //emit every .75 seconds
      Rx.Observable.interval(750),
          //emit every 1 second
          Rx.Observable.interval(1000)
        );
//throttle in middle of emitted values
const example = source.throttleTime(1200);
//output: 0...1...4...4...8...7
const subscribe = example.subscribe(val => console.log(val));

Additional Resources


:file_folder: Source Code: https://github.com/ReactiveX/rxjs/blob/master/src/operator/throttleTime.ts

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