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Mastering Swift 4 - Fourth Edition by Jon Hoffman

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Concurrency and Parallelism in Swift

When I first started learning Objective-C, I already had a good understanding of concurrency and multitasking with my background in other languages, such as C and Java. This background made it very easy for me to create multithreaded applications using threads. Then, Apple changed everything when they released Grand Central Dispatch (GCD) with OS X 10.6 and iOS 4. At first, I went into denial; there was no way GCD could manage my application's threads better than I could. Then I entered the anger phase; GCD was hard to use and understand. Next was the bargaining phase; maybe I can use GCD with my threading code, so I could still control how the threading worked. Then there was the depression phase; maybe ...

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