Mastering Kotlin

Coroutines

Coroutines allow us to write asynchronous code in a sequential fashion without the use of callbacks. They are a part of the Kotlin language, and are now the default, Kotlin-idomatic way to write non-blocking code.

The following snippet demonstrates a basic example of using coroutines:

fun main() {    GlobalScope.launch {        delay(500)        println("Coroutines")    }    println("Hello")    Thread.sleep(1000)}

In this example, a new coroutine is started by calling GlobalScope.launch { }. This code will be run in the background without blocking the starting thread. This code will produce the following output:

HelloCoroutines

Because the launched coroutine doesn't block, Hello will be printed before the Coroutines line is printed within the coroutine. ...