Chapter 12. 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 like C and Java. This background made it very easy for me to create multithreaded applications using threads in Objective-C. Then Apple changed everything for me 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 GCD does handle the threading better then I can. Finally, I entered the WOW phase; this GCD thing is really easy to use and works amazingly well. After using Grand Central Dispatch and Operation Queues with...