How to Convert an Array of Strings to an Array of Integers in Kotlin

How to Convert an Array of Strings to an Array of Integers in Kotlin ?

Answer

To convert an array of strings to an array of integers in Kotlin, you can use the map function combined with the toInt method.

✐ Examples

1 Convert Array of Strings to Array of Integers

In this example,

We create an array of strings named stringArray with numerical string values.
We use the map function on stringArray to transform each string element into an integer. The map function applies the toInt method to each element of the array.
The result of the map function is a list of integers, which we convert to an array using the toTypedArray method.
Finally, we print the converted array to standard output.

Kotlin Program

fun main(args: Array<String>) {
    val stringArray = arrayOf("1", "2", "3", "4", "5")
    val intArray = stringArray.map { it.toInt() }.toTypedArray()
    println("Converted array: ${intArray.joinToString()}")
}

Output

Converted array: 1, 2, 3, 4, 5

2 Handle Array of Strings with Non-Numeric Values

In this example,

We create an array of strings named stringArray with both numerical and non-numerical string values.
We use the mapNotNull function on stringArray to transform each string element into an integer, ignoring any non-numeric values. The mapNotNull function applies the toIntOrNull method to each element, which returns null for non-numeric values.
The result of the mapNotNull function is a list of integers, which we convert to an array using the toTypedArray method.
Finally, we print the converted array to standard output.

Kotlin Program

fun main(args: Array<String>) {
    val stringArray = arrayOf("1", "two", "3", "four", "5")
    val intArray = stringArray.mapNotNull { it.toIntOrNull() }.toTypedArray()
    println("Converted array: ${intArray.joinToString()}")
}

Output

Converted array: 1, 3, 5

Summary

In this tutorial, we learned How to Convert an Array of Strings to an Array of Integers in Kotlin language with well detailed examples.

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How to Convert an Array of Strings to an Array of Integers in Kotlin

How to Convert an Array of Strings to an Array of Integers in Kotlin ?

Answer

✐ Examples

1 Convert Array of Strings to Array of Integers

Kotlin Program

Output

2 Handle Array of Strings with Non-Numeric Values

Kotlin Program

Output

Summary

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