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Learn RxJS
bufferTime
signature: bufferTime(bufferTimeSpan: number, bufferCreationInterval: number, scheduler: Scheduler): Observable
bufferTime(bufferTimeSpan: number, bufferCreationInterval: number, scheduler: Scheduler): ObservableCollect emitted values until provided time has passed, emit as array.
Examples
Example 1: Buffer for 2 seconds
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// RxJS v6+
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import { interval } from 'rxjs';
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import { bufferTime } from 'rxjs/operators';
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//Create an observable that emits a value every 500ms
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const source = interval(500);
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//After 2 seconds have passed, emit buffered values as an array
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const example = source.pipe(bufferTime(2000));
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//Print values to console
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//ex. output [0,1,2]...[3,4,5,6]
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const subscribe = example.subscribe(val =>
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console.log('Buffered with Time:', val)
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);
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Example 2: Multiple active buffers
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// RxJS v6+
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import { interval } from 'rxjs';
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import { bufferTime } from 'rxjs/operators';
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//Create an observable that emits a value every 500ms
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const source = interval(500);
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/*
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bufferTime also takes second argument, when to start the next buffer (time in ms)
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for instance, if we have a bufferTime of 2 seconds but second argument (bufferCreationInterval) of 1 second:
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ex. output: [0,1,2]...[1,2,3,4,5]...[3,4,5,6,7]
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*/
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const example = source.pipe(bufferTime(2000, 1000));
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//Print values to console
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const subscribe = example.subscribe(val =>
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console.log('Start Buffer Every 1s:', val)
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);
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Additional Resources
- 📰 - Official docs
Last modified 9mo ago