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How to create a mutable list with repeating elements in Kotlin?
A Mutable List is an interface and generic collection of elements. Once a collection is declared as mutable, it becomes dynamic and we can modify its data as per requirement. A mutable list grows automatically in size as we insert new elements into it. The Mutable List inherits form the Generic<T> class.
Example – Creating a Mutable List in Kotlin
In order to create a mutable list of repeating elements, we will be using Kotlin List(). By definition, it looks like this−
inline fun <T> List( size: Int, init: (index: Int) -> T ): List<T>
As we pass an initial default value, it creates a read only list of specified number of elements. In this List(), each element is calculated by calling the specified init function.
In this example, we will be using a Mutable List to create a list of the squares of the first 5 numbers.
fun main(args: Array<String>) {
val squares = MutableList(5) { (it + 1) * (it + 1) }
// printing the squares of first 5 elements
println(squares)
}Output
It will produce the following output −
[1, 4, 9, 16, 25]
Example – Creating a Mutable List with Repeating Elements in Kotlin
In order to create a dummy mutable list, we can just modify the above piece of code with a dummy String. As a result, we will be getting a mutable list of repeating elements.
fun main(args: Array<String>) {
val squares = MutableList(5) {"Dummy"}
println(squares)
}Output
On execution, it will produce the following output −
[Dummy, Dummy, Dummy, Dummy, Dummy]
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