What is multicasting?

Multi-casting is the practice of broadcasting to a list of multiple subscribers in a single execution.

Let's demonstrate the multi-casting feature,

var source = Rx.Observable.from([1, 2, 3]);
var subject = new Rx.Subject();
var multicasted = source.multicast(subject);
// These are, under the hood, `subject.subscribe({...})`:
next: (v) => console.log('observerA: ' + v),
next: (v) => console.log('observerB: ' + v),
// This is, under the hood, `s

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