[RxJS] Filtering operators: throttle and throttleTime
Debounce is known to be a rate-limiting operator, but it's not the only one. This lessons introduces you to throttleTime and throttle, which only drop events (without delaying them) to accomplish rate limiting.
var foo = Rx.Observable.interval(500).take(5); /*
--0--1--2--3--4|
debounceTime(1000) // waits for silence, then emits
throttleTime(1000) // first emits, then causes silence
--0-----2-----4|
*/ var result = foo.throttleTime(1000); result.subscribe(
function (x) { console.log('next ' + x); },
function (err) { console.log('error ' + err); },
function () { console.log('done'); },
);
throttle( () => Observable):
var foo = Rx.Observable.interval(500).take(5); /*
--0--1--2--3--4|
throttle( () => Rx.Observalbe.interval(1000).take(1)) // first emits, then causes silence
--0-----2-----4|
*/ var result = foo.throttle( () => Rx.Observable.interval(1000).take(1)); result.subscribe(
function (x) { console.log('next ' + x); },
function (err) { console.log('error ' + err); },
function () { console.log('done'); },
);
Result for both:
/* "next 0"
"next 2"
"next 4"
"done" */
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