Finally, we subscribe to the observable stream and use the data in the observer. We then create an observable stream using the just method and flatMap the user data stream into the observable stream. We use the subscribeOn method to specify that the operation should be performed on the IO scheduler. In this example, we use the fromCallable method to create a Single that performs an IO-bound operation and returns a List. To create a coroutine, we use the launch function from the routines library: import routines.* fun main()

Instead, coroutines use suspension, which means that they can pause and resume execution at specific points in the code without blocking the thread. They provide a way to perform asynchronous operations without blocking the main thread or creating additional threads explicitly. Kotlin Coroutines are a lightweight, efficient, and easy-to-use concurrency framework introduced in Kotlin 1.3. In this article, we will explore the basics of both frameworks, their similarities, and differences, and when to choose one over the other. Two popular frameworks for asynchronous programming in the Java ecosystem are Kotlin Coroutines and RxJava. Asynchronous programming is an essential part of modern software development, allowing us to create responsive and scalable applications.

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