doc/api/core/operators/expand.md
Rx.Observable.prototype.expand(selector, [scheduler])Expands an observable sequence by recursively invoking selector.
selector (Function): Selector function to invoke for each produced element, resulting in another sequence to which the selector will be invoked recursively again.scheduler=Rx.Scheduler.immediate] (Scheduler): Scheduler on which to perform the expansion. If not provided, this defaults to the immediate scheduler.(Observable): An observable sequence containing a single element determining whether all elements in the source sequence pass the test in the specified predicate.
var source = Rx.Observable.return(42)
.expand(function (x) { return Rx.Observable.return(42 + x); })
.take(5);
var subscription = source.subscribe(
function (x) {
console.log('Next: %s', x);
},
function (err) {
console.log('Error: %s', err);
},
function () {
console.log('Completed');
});
// => Next: 42
// => Next: 84
// => Next: 126
// => Next: 168
// => Next: 210
// => Completed
File:
Dist:
Prerequisites:
NPM Packages:
NuGet Packages:
Unit Tests: