From the course: Learning Combine with Swift

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Publish and subscribe to data with subjects

Publish and subscribe to data with subjects - Swift Tutorial

From the course: Learning Combine with Swift

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Publish and subscribe to data with subjects

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- [Instructor] What is a publisher and the subscriber? Combine provides a special mechanism for publishing and subscribing using a single method called a subject, sounds intriguing. Let's explore further. A subject is considered a special type of publisher conforming to its own protocol, the subject protocol. Apple defines subjects as a publisher that exposes a method for outside callers to publish elements. And that's where the methods send comes in, enabling you to inject values into a stream. You would commonly use this approach to bridge existing imperative written code with the combined framework. Send is also invoked when one is broadcasting values to multiple subscribers connected to a subject. This is why subjects are often used to filter multiple publishers together or fan out as multiple publishers. A subject is an aggregator for subscribers to connect with publishers based on demand, so only subscribers that…

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