Combine: switchToLatest

With this short reference code snippet, you will be able to use the convenient switchToLatest() operator when configuring subscribers in Combine.

Combine: switchToLatest

This brief overview will demonstrate some basic features that may come in handy when working with publishers in Combine, Apple's framework to handle asynchronous events by combining event-processing operators. The Publisher protocol declares a type that transmits a sequence of values over time that subscribers can receive as input by adopting the Subscriber protocol.

A common use case would be that multiple requests for asynchronous work may be issued, but only the latest request is really needed. For example, requests could be aimed at loading images from a remote source. A user might tap on a button to load the image but may decide to move on and tap on another button to load another image before the first request is even completed. In this case, subscriptions in Combine can be configured with a .switchToLatest() operator to receive a new publisher from the upstream publisher and cancel its previous subscription.

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