Get subarray of an array between given indexes in Kotlin

This article explores different ways to get a subarray of an array between given indexes in Kotlin.

1. Using `copyOfRange()` function

In Kotlin, you can use the copyOfRange() to copy the given range into a new array.

fun main() {

val arr = intArrayOf(0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10)

val start = 2

val end = 5

val subarray = arr.copyOfRange(start, end + 1)

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

}

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2. Using `map()` function

Here, the idea is to get the valid indices of the subarray in the array and transform the indices into the corresponding element in the original array and return the collection as an array.

fun main() {

val arr = intArrayOf(0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10)

val start = 2

val end = 5

val subarray = (start..end)

.map { i: Int -> arr[i] }

.toIntArray();

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

}

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3. Custom Routine

Finally, you can write your custom routine, which creates a new array and copy elements from the original array to the new array by iterating over between given indexes.

fun main() {

val arr = intArrayOf(0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10)

val start = 2

val end = 5

val subarray = IntArray(end - start + 1)

for (i in subarray.indices) {

subarray[i] = arr[start + i]

}

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

}

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That’s all about getting a subarray of an array between given indexes in Kotlin.

Get subarray of an array between given indexes in Kotlin

1. Using copyOfRange() function

2. Using map() function

3. Custom Routine

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1. Using `copyOfRange()` function

2. Using `map()` function