My use case is as following: I get events, which sometimes happen in bursts. If a burst occurs, I only need to handle it once though. Debounce does this.
However, debounce only gives me the last element of a burst, but I need to know about all elements in a burst to aggregate on them (using flatmap).
This could be done by a timed window or buffer, however, these are fixed intervals, so a buffer/window timeout could occur in the middle of a burst, therefore splitting the burst in 2 parts to handle instead of 1.
So what I'd want is something like
.
.
event: a
.
. -> a
.
.
.
.
.
.event: b
.event: c
.event: d
.
.-> b,c,d
.
.
.
.
.event : e
.
. -> e
.
This can be achieved with buffer by passing a debounced stream in as a closing selector, e.g.:
var s = Rx.Observable.of('a')
.merge(Rx.Observable.of('b').delay(100))
.merge(Rx.Observable.of('c').delay(150))
.merge(Rx.Observable.of('d').delay(200))
.merge(Rx.Observable.of('e').delay(300))
.share()
;
s.buffer(s.debounce(75)).subscribe(x => console.log(x));
Here's a runnable version: https://jsbin.com/wusasi/edit?js,console,output