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How to initialize List in Kotlin?
List<T> denotes a List collection of generic data type. By <T>, we understand that the List does not have any specific data type. Let's check how we can initialize such a collection in Kotlin.
List<T> can be of two types: immutable and mutable. We will see two different implementations of initializing List<T>.
Example – Initialize List<T> ~ Immutable List
Once a list is declared as Immutable, then it becomes read-only.
fun main(args: Array<String>) {
var myImmutableList = listOf(1, 2, 3)
// Convert array into mutableList
// Then, add elements into it.
myImmutableList.toMutableList().add(4)
// myImmutableList is not a mutable List
println("Example of Immutable list: " + myImmutableList)
}Output
In this example, we have declared an immutable list called "myImmutableList" and we have printed the same after adding a value in it.
Example of Immutable list: [1, 2, 3]
Example – Initialize List<T> ~ Mutable List
We can modify the values of a mutable list. The following example shows how to initialize a mutable list.
fun main(args: Array<String>) {
val myMutableList = mutableListOf(1, 2, 3)
myMutableList.add(4)
println("Example of mutable list: " + myMutableList)
}Output
It will produce the following output −
Example of mutable list: [1, 2, 3, 4]
Updated on: 16-Mar-2022
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