Day159 — Kotlin tips

1. convert callback to coroutine to avoid callback hell using suspendCoroutine

Make Any Callback a Suspend Function in Kotlin 🤯 #Shorts

callback:

suspendCoroutine:

note that suspendCoroutine does not change the CoroutineContext. It simply converts callback to suspend function which is more manageable.

2. out

THIS Is What the Out Keyword Is All About In Kotlin

declaration-site variance: you can annotate the type parameter T of Source to make sure that it is only returned (produced) from members of Source<T>, and never consumed.

https://kotlinlang.org/docs/generics.html#declaration-site-variance

What is out keyword in kotlin

In and out type variant of Kotlin

3. inline function

THIS Keyword Boosts the Performance of Your Kotlin Code🤯

https://www.baeldung.com/kotlin/inline-functions#inline-functions

When using inline functions, there is no extra object allocation and no extra virtual method calls.