throttle
Emits a value from the source Observable, then ignores subsequent source values for a duration determined by another Observable, then repeats this process.
throttle<T>(durationSelector: (value: T) => SubscribableOrPromise<any>, config: ThrottleConfig = defaultThrottleConfig): MonoTypeOperatorFunction<T>Parameters
Returns
MonoTypeOperatorFunction<T>: An Observable that performs the throttle operation to
limit the rate of emissions from the source.
Description
It's like throttleTime, but the silencing
duration is determined by a second Observable.
throttle emits the source Observable values on the output Observable
when its internal timer is disabled, and ignores source values when the timer
is enabled. Initially, the timer is disabled. As soon as the first source
value arrives, it is forwarded to the output Observable, and then the timer
is enabled by calling the durationSelector function with the source value,
which returns the "duration" Observable. When the duration Observable emits a
value or completes, the timer is disabled, and this process repeats for the
next source value.
Example
Emit clicks at a rate of at most one click per second
import { fromEvent } from 'rxjs';
import { throttle } from 'rxjs/operators';
const clicks = fromEvent(document, 'click');
const result = clicks.pipe(throttle(ev => interval(1000)));
result.subscribe(x => console.log(x));