Property observers in Swift — Swift by Sundell

www.swiftbysundell.com

Being able to observe changes in various values is essential for many different kinds of programming styles and techniques. While there are a number of abstractions that we can create to be able to observe and communicate such value changes in different ways — Swift comes built-in with a simple, yet powerful way to attach observations to any kind of non-lazy, stored property — appropriately named property observers.

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