# Coroutines in Kotlin 1.3 explained: Suspending functions, contexts, builders and scopes

DevFeed: [Coroutines in Kotlin 1.3 explained: Suspending functions, contexts, builders and scopes](<https://devfeed.tech/articles/coroutines-in-kotlin-1-3-explained-suspending-functions-contexts-builders-and-scopes-27182.md>)

Original publisher: [Read original article](<https://antonioleiva.com/kotlin-coroutines>)

Published: 2019-01-31T00:00:00Z

Content type: tutorial

Language: en

Sources: [Antonio Leiva](<https://devfeed.tech/sources/antonio-leiva.md>)

Topics: [Coroutines](<https://devfeed.tech/topics/coroutines.md>), [Kotlin](<https://devfeed.tech/topics/kotlin.md>), [Android](<https://devfeed.tech/topics/android.md>)

Tags: [asynchronous](<https://devfeed.tech/tags/asynchronous.md>), [callback](<https://devfeed.tech/tags/callback.md>), [coroutines](<https://devfeed.tech/tags/coroutines.md>), [kotlin](<https://devfeed.tech/tags/kotlin.md>)

## AI overview

This tutorial explains Kotlin coroutines, including how they simplify asynchronous code by using a synchronous style instead of callbacks. It introduces their history from experimental support in Kotlin 1.1 to the final, production-ready API in Kotlin 1.3, then uses a login flow to illustrate sequential and concurrent server requests and callback complexity.

## Source excerpt

Everything Android, Kotlin and other random topics