How to Insert an Element at Specific Index in a List in Kotlin - Step by Step Examples

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How to Insert an Element at Specific Index in a List in Kotlin ?

Answer

To insert an element at a specific index in a list in Kotlin, you can use the add method or addAt function.

✐ Examples

1 Insert Element at Specific Index Using add

In this example,

We create a mutable list named numbers with initial integer values.
We use the add method to insert a new element at the desired index.
The add method shifts the existing elements to the right to make space for the new element.
Finally, we print the updated list to standard output.

Kotlin Program

fun main() {
    val numbers = mutableListOf(1, 2, 3, 4, 5)
    numbers.add(2, 10)
    println("Updated list: $numbers")
}

Output

Updated list: [1, 2, 10, 3, 4, 5]

2 Insert Element at Specific Index Using addAt Function

In this example,

We define an extension function named addAt on the MutableList class to insert an element at a specific index.
Within the addAt function, we use the add method to insert the element at the specified index.
Finally, we use the addAt function to insert an element at the desired index in the list.
We print the updated list to standard output.

Kotlin Program

fun main() {
    val numbers = mutableListOf(1, 2, 3, 4, 5)
    numbers.addAt(2, 10)
    println("Updated list: $numbers")
}

fun <T> MutableList<T>.addAt(index: Int, element: T) {
    add(index, element)
}

Output

Updated list: [1, 2, 10, 3, 4, 5]

Summary

In this tutorial, we learned How to Insert an Element at Specific Index in a List in Kotlin language with well detailed examples.

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How to Insert an Element at Specific Index in a List in Kotlin - Step by Step Examples

How to Insert an Element at Specific Index in a List in Kotlin ?

Answer

✐ Examples

1 Insert Element at Specific Index Using add

Kotlin Program

Output

2 Insert Element at Specific Index Using addAt Function

Kotlin Program

Output

Summary

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