Kotlin onEach() vs forEach() example

#kotlin #oneach #foreach

https://grokonez.com/kotlin/kotlin-oneach-vs-foreach-example

In the tutorial, JavaSampleApproach will show the difference between Kotlin onEach() vs forEach().

I. Kotlin onEach vs forEach

Kotlin provides 2 methods to perform the given [action] on each element: onEach and forEach. Method signature:

forEach


// for Collection
public inline fun  Map.forEach(action: (Map.Entry) -> Unit): Unit 

// for Map
public inline fun  Iterable.forEach(action: (T) -> Unit): Unit

onEach


// for Collection
public inline fun > C.onEach(action: (T) -> Unit): C

// for Map
public inline fun > M.onEach(action: (Map.Entry) -> Unit): M

What is the main difference between forEach() vs onEach()?
-> forEach() method just performs the given [action] on each element. While onEach() method performs the given [action] on each element and returns the collection itself afterwards.