Convert Array<Any> to Array<Int> in Kotlin

This article explores different ways to convert Array<Any> to Array<Int> in Kotlin.

1. Using `map()` function

Here, the idea is to convert the array into a list and transform each element into a corresponding int value using the map() function. Finally, return the list as an array using toTypedArray() function.

fun main() {

val src: Array<Any> = arrayOf(4, 3, 5, 2, 8)

val dest: Array<Int> = src.toList()

.map { i -> i.toString().toInt() }

.toTypedArray()

println(dest.contentToString()) // [4, 3, 5, 2, 8]

}

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2. Using `System.arraycopy()` function

Another solution is to use the System.arraycopy() to copy an array to another array. This will work fine for arrays of different types when an element in the source array can be stored in the destination array.

fun main() {

val src: Array<Any> = arrayOf(4, 3, 5, 2, 8)

val dest: Array<Int?> = arrayOfNulls(src.size)

System.arraycopy(src, 0, dest, 0, src.size)

println(dest.contentToString()) // [4, 3, 5, 2, 8]

}

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3. Custom Routine

The idea is to iterate over the array using a for-loop and copy every element to an integer array after converting it into its corresponding integer value.

fun main() {

val src: Array<Any> = arrayOf(4, 3, 5, 2, 8)

val dest: Array<Int?> = arrayOfNulls(src.size)

for (i in src.indices) {

dest[i] = src[i] as Int

}

println(dest.contentToString()) // [4, 3, 5, 2, 8]

}

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That’s all about converting an Object array to an Integer array in Kotlin.

Convert Array<Any> to Array<Int> in Kotlin

1. Using map() function

2. Using System.arraycopy() function

3. Custom Routine

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1. Using `map()` function

2. Using `System.arraycopy()` function