`Rx.Observable.prototype.multicast(subject | subjectSelector, [selector])`

Ⓢ

Multicasts the source sequence notifications through an instantiated subject into all uses of the sequence within a selector function. Each subscription to the resulting sequence causes a separate multicast invocation, exposing the sequence resulting from the selector function's invocation. For specializations with fixed subject types, see publish, share, publishValue, shareValue, publishLast, replay, and shareReplay.

Arguments

subjectSelector (Function): Factory function to create an intermediate subject through which the source sequence's elements will be multicast to the selector function.
subject (Subject): Subject to push source elements into.
[selector] (Function): Optional selector function which can use the multicasted source sequence subject to the policies enforced by the created subject. Specified only if subjectSelector is provided.

Returns

(Observable): An observable sequence that contains the elements of a sequence produced by multicasting the source sequence within a selector function.

Example

var subject = new Rx.Subject();
var source = Rx.Observable.range(0, 3)
    .multicast(subject);

var observer = Rx.Observer.create(
    function (x) {
        console.log('Next: ' + x);
    },
    function (err) {
        console.log('Error: ' + err);
    },
    function () {
        console.log('Completed');
    }
);

var subscription = source.subscribe(observer);
subject.subscribe(observer);

var connected = source.connect();

subscription.dispose();

// => Next: 0
// => Next: 0
// => Next: 1
// => Next: 1
// => Next: 2
// => Next: 2
// => Completed