Coroutines are components of a computer program that can be considered lightweight threads. Coroutines allow us to suspend the invocation of a function without blocking a thread. Let's imagine a case in which you need to perform a request on the server and display a progress bar until your app receives the response. A request is a long-term operation that should be performed asynchronously because a user interface should stay responsive. This is a common approach to running a new thread that uses a callback so that you're notified when the app receives a response. However, using code with callbacks looks unnatural, complex, and can lead to bugs.
Coroutines can be considered as a library that wraps a particular part of code with the creation of new threads and callbacks. This approach allows you to write asynchronous code in a way that looks as if...
