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You’ll start by analyzing the non-suspendable, regular, variant first. The system differentiates these two functions by the suspend modifier at compile time, but where and how do these functions work differently, and how do both functions work with respect to the suspension mechanism in Kotlin coroutines? The answer can be found by analyzing the bytecode each of the functions generate, and by explaining how the call-stack works in both of the cases. You’d have to wrap the suspendable function in a launch block, because the Kotlin coroutines API is built like that, but the actual function call doesn’t change. If you go a step further and duplicate a function you use, but add the suspend modifier keyword at the start, you could call both of the functions with the same parameters. But when you’re using two functions, a suspendable and a regular one, the calls seem pretty much the same. Suspended code is based on the same concepts as regular code, except the system has the ability to pause its execution and continue it later on. Up until now, you’ve learned that coroutines rely on the concept of suspending code and suspending functions. Throughout it all, you will learn what the most important piece of the coroutines puzzle is. You will see how you can convert existing code, which relies on callbacks, to suspendable functions, which are called in the same way as regular, blocking, functions.

In this chapter, you’ll learn more about how suspendable functions work from within. However, the base foundation of coroutines is the ability to suspend code, control its flow at will, and return values from synchronous and asynchronous operations with the same kind of syntax and sequential code structure. You’ve seen how to launch coroutines and deliver asynchronous work without any overhead from thread allocations or memory leaks.

So far, you’ve learned a lot about coroutines. 12.1 Getting started with broadcast channels.10.5 Yield and YieldAll at your service.Building Sequences & Iterators with Yield Section II: Channels & Flows Section 2: 6 chapters Show chapters Hide chapters 1.9 Explaining coroutines: The inner works.1.7 Diving deeper into the complexity of Rx.