Example 1: Throttle for 2 seconds, based on second observable
( StackBlitz | jsBin | jsFiddle )
// RxJS v6+import { interval } from 'rxjs';import { throttle } from 'rxjs/operators';//emit value every 1 secondconst source = interval(1000);//throttle for 2 seconds, emit latest valueconst example = source.pipe(throttle(val => interval(2000)));//output: 0...3...6...9const subscribe = example.subscribe(val => console.log(val));
Example 2: Throttle with promise
( StackBlitz | jsBin | jsFiddle )
// RxJS v6+import { interval } from 'rxjs';import { throttle, map } from 'rxjs/operators';//emit value every 1 secondconst source = interval(1000);//incrementally increase the time to resolve based on sourceconst promise = val =>new Promise(resolve =>setTimeout(() => resolve(`Resolved: ${val}`), val * 100));//when promise resolves emit item from sourceconst example = source.pipe(throttle(promise),map(val => `Throttled off Promise: ${val}`));const subscribe = example.subscribe(val => console.log(val));
throttle 📰 - Official docs
Filtering operator: throttle and throttleTime
🎥 💵 - André Staltz
📁 Source Code: https://github.com/ReactiveX/rxjs/blob/master/src/internal/operators/throttle.ts