arrayOfNulls

Returns an array of objects of the given type with the given size, initialized with null values.

expect fun <T> arrayOfNulls(size: Int): Array<T?>(source)

val numbers: Array<Int?> = arrayOfNulls(4)

numbers[0] = 10
numbers[2] = 30

println(numbers.contentToString()) // Output: [10, null, 30, null]

Source