bufferWhen

signature: bufferWhen(closingSelector: function): Observable

Collect all values until closing selector emits, emit buffered values.

Examples

Example 1: Emit buffer based on interval

( jsBin | jsFiddle )

//emit value every 1 second
const oneSecondInterval = Rx.Observable.interval(1000);
//return an observable that emits value every 5 seconds
const fiveSecondInterval = () => Rx.Observable.interval(5000);
//every five seconds, emit buffered values
const bufferWhenExample = oneSecondInterval.bufferWhen(fiveSecondInterval);
//log values
//ex. output: [0,1,2,3]...[4,5,6,7,8]
const subscribe = bufferWhenExample.subscribe(val => console.log('Emitted Buffer: ', val));

Additional Resources


:file_folder: Source Code: https://github.com/ReactiveX/rxjs/blob/master/src/operator/bufferWhen.ts

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