Core Data works well with concurrency as long as you keep a few simple rules in mind. This chapter will teach you how to make sure that your Core Data app is able to handle concurrency properly…

…possibly in a random order, yet still result in a correct implementation of your data flow. Moderns devices almost always have more than a single CPU, and Apple’s iPhones have been dual core since 2011. Having more than one core means they are capable of running more than…

…work that could be performed on another thread. Optimized resource consumption: Threads are highly optimized by the OS. Sounds great, right? More cores, more threads, faster app. I bet you’re ready to learn how to create one, right? Too bad! In reality, you should never find yourself needing…

…method or a closure — that can be run in parallel, depending on availability of resources; it then executes the tasks on an available processor core. Note: Apple’s documentation sometimes refers to a block in lieu of closure, since that was the name used in Objective-C. You can consider…