Learn RxJS
Search…
debounce
signature: debounce(durationSelector: function): Observable
debounce(durationSelector: function): ObservableDiscard emitted values that take less than the specified time, based on selector function, between output.
💡 Though not as widely used as debounceTime, debounce is important when the debounce rate is variable!
Examples
Example 1: Debounce on timer
1
// RxJS v6+
2
import { of, timer } from 'rxjs';
3
import { debounce } from 'rxjs/operators';
4
5
//emit four strings
6
const example = of('WAIT', 'ONE', 'SECOND', 'Last will display');
7
/*
8
Only emit values after a second has passed between the last emission,
9
throw away all other values
10
*/
11
const debouncedExample = example.pipe(debounce(() => timer(1000)));
12
/*
13
In this example, all values but the last will be omitted
14
output: 'Last will display'
15
*/
16
const subscribe = debouncedExample.subscribe(val => console.log(val));
Copied!
Example 2: Debounce at increasing interval
1
// RxJS v6+
2
import { interval, timer } from 'rxjs';
3
import { debounce } from 'rxjs/operators';
4
5
//emit value every 1 second, ex. 0...1...2
6
const interval$ = interval(1000);
7
//raise the debounce time by 200ms each second
8
const debouncedInterval = interval$.pipe(debounce(val => timer(val * 200)));
9
/*
10
After 5 seconds, debounce time will be greater than interval time,
11
all future values will be thrown away
12
output: 0...1...2...3...4......(debounce time over 1s, no values emitted)
13
*/
14
const subscribe = debouncedInterval.subscribe(val =>
15
console.log(`Example Two: ${val}`)
16
);
Copied!
Additional Resources
- 🎥 💵 - André Staltz
Last modified 1yr ago