DebounceTime

Emits a value from the source Observable only after a particular time span has passed without another source emission.

It's like delay, but passes only the most recent value from each burst of emissions.

debounceTime delays values emitted by the source Observable, but drops previous pending delayed emissions if a new value arrives on the source Observable. This operator keeps track of the most recent value from the source Observable, and emits that only when dueTime enough time has passed without any other value appearing on the source Observable. If a new value appears before dueTime silence occurs, the previous value will be dropped and will not be emitted on the output Observable.Reference: https://rxjs.dev/api/operators/debounceTime

Examples:

// RxJS v6+
import { fromEvent } from 'rxjs';
import { debounceTime, map } from 'rxjs/operators';

// elem ref
const searchBox = document.getElementById('search');

// streams
const keyup$ = fromEvent(searchBox, 'keyup');

// wait .5s between keyups to emit current value
keyup$
  .pipe(
    map((i: any) => i.currentTarget.value),
    debounceTime(500)
  )
  .subscribe(console.log);