Question

What is multicasting in Angular?

Answer 1

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

Let's take a simple example to demonstrate the multi-casting feature:

1. var source = Rx.Observable.from([1, 2, 3]);  
2. var subject = new Rx.Subject();  
3. var multicasted = source.multicast(subject);  
4. // These are, under the hood, `subject.subscribe({...})`:  
5. multicasted.subscribe({  
6.   next: (v) => console.log('observerA: ' + v)  
7. });  
8. multicasted.subscribe({  
9.   next: (v) => console.log('observerB: ' + v)  
10. });