expand.md

Rx.Observable.prototype.expand(selector, [scheduler])

Ⓢ

Expands an observable sequence by recursively invoking selector.

Arguments

1. selector (Function): Selector function to invoke for each produced element, resulting in another sequence to which the selector will be invoked recursively again.
2. [scheduler=Rx.Scheduler.immediate] (Scheduler): Scheduler on which to perform the expansion. If not provided, this defaults to the immediate scheduler.

Returns

(Observable): An observable sequence containing a single element determining whether all elements in the source sequence pass the test in the specified predicate.

Example

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: ' + x);
    },
    function (err) {
        console.log('Error: ' + err);
    },
    function () {
        console.log('Completed');
    });

// => Next: 42
// => Next: 84
// => Next: 126
// => Next: 168
// => Next: 210
// => Completed

Location

File:

• /src/core/linq/observable/expand.js

Dist:

• rx.all.js
• rx.all.compat.js
• rx.experimental.js

Prerequisites:

• rx.js | rx.compat.js | rx.lite.js | rx.lite.compat.js

NPM Packages:

• rx

NuGet Packages:

• RxJS-All
• RxJS-Experimental

Unit Tests:

• /tests/observable/expand.js