Hands-On Object-Oriented Programming with Kotlin

Arrays with lambda expressions

Kotlin allows us to declare and initialize an array with a lambda expression. The array constructor takes two parameters: the size of the array and a lambda expression. If the array is an IntArray, the expression takes an integer and returns an integer as well:

public inline constructor(size: Int, init: (Int) -> Int)

Take a look at the following example. Here, intArray has 5 elements, and each element is initialized with an incrementing value that starts from 1:

fun arrayWithLambda(){   val intArray = IntArray(5) { it }   for (element in intArray){       println(element)   }}

Kotlin not only declares an array of a size of 5, but it also initializes the array with a value passed to the lambda expression. The lambda ...