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Concurrency is hard. Really hard. But it's also integral to building a responsive, high-performance app. Apple provides a couple of different technologies that allow you to make your apps concurrent and in this talk we'll investigate how and when to best use each of them. We'll cover Grand Central Dispatch, including queues, groups and barriers before taking a look at the higher-level abstraction NSOperation. We'll also cover some 3rd-party approaches to concurrency such as promises.
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