Rx.Observable.prototype.throttleFirst(windowDuration, [scheduler])
Returns an Observable that emits only the first item emitted by the source Observable during sequential time windows of a specified duration.
windowDuration
(Number
): Time to wait before emitting another item after emitting the last item (specified as an integer denoting milliseconds).[scheduler=Rx.Scheduler.timeout]
(Scheduler
): The Scheduler to use internally to manage the timers that handle timeout for each item. If not provided, defaults to Scheduler.timeout.(Observable
): An Observable that performs the throttle operation.
var times = [
{ value: 0, time: 100 },
{ value: 1, time: 600 },
{ value: 2, time: 400 },
{ value: 3, time: 900 },
{ value: 4, time: 200 }
];
// Delay each item by time and project value;
var source = Rx.Observable.from(times)
.flatMap(function (item) {
return Rx.Observable
.of(item.value)
.delay(item.time);
})
.throttleFirst(300 /* ms */);
var subscription = source.subscribe(
function (x) {
console.log('Next: %s', x);
},
function (err) {
console.log('Error: %s', err);
},
function () {
console.log('Completed');
});
// => Next: 0
// => Next: 2
// => Next: 3
// => Completed