Multicasting vs. Unicasting
Explore the concepts of multicasting and unicasting in RxJS to understand how data streams are shared or isolated among subscribers. Learn the distinction between hot and cold observables, how producers affect data emission, and when to use multicasting with subjects for efficient event handling.
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Multicasting essentials
Multicasting is one of the concepts that often confuse people when first learning RxJS. But this concept is really useful and solves many problems in web applications. In this chapter, we’ll demystify this concept for you and make it simple. We’ll start by explaining the difference between multicasting and unicasting, and then we’ll explore RxJS subjects.
Before hitting the concept of multicasting, let's understand what producer means. A producer is the source of values of the observable. For example, DOM events, WebSockets, and HTTP requests are regarded as producers. Basically, it’s any data source used to get values.
Observables basically fall into two types—hot and cold. Let’s examine the difference between them.