Kotlin - Data Type Arrays

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Introduction

Kotlin can create an array by using the library function arrayOf():

Demo

fun main(args: Array<String>) {

        val array = arrayOf(1, 2, 3) 
        //from w  ww. j  a v  a2s  .com
        println(array)
}

Or, we can create an Array from an initial size and a function, which is used to generate each element:

Demo

fun main(args: Array<String>) {

        val perfectSquares = Array(10, { k -> k * k }) 

        println(perfectSquares)/*from  w w w  .  j a va 2  s. c o  m*/
}

Kotlin arrays are regular collection classes.

Instances of arrays class have an iterator function and a size function, as well as a get and a set function.

The get and set functions are available through bracket syntax:

Demo

fun main(args: Array<String>) {
        val array = arrayOf(1, 2, 3) 
        val element1 = array[0] 
        val element2 = array[1] 
        array[2] = 5 /*from  www .j a  v a  2s  .co m*/
        println(array)
}

To avoid boxing types, Kotlin provides alternative array classes that are specialized for each of the primitive types.

The provided classes are ByteArray, CharArray, ShortArray, IntArray, LongArray, BooleanArray, FloatArray, and DoubleArray.