Kotlin - Create an ArrayList of random Integers of specified length?

Issue

I have an ArrayList like this :

var amplititudes : ArrayList<Int> = ArrayList()

I want to populate this with random Ints. How can I do this?

Solution

One option is to use the array constructor as following:

var amplititudes  = IntArray(10) { Random.nextInt() }.asList()

Another strategy is:

var amplititudes  = (1..10).map { Random.nextInt() }

EDIT

As suggested in the comment instead of creating an instance of Random each time it is better to initialize it once:

val ran = Random
var amplititudes  = (1..10).map { ran.nextInt() }

Answered By - Md Johirul Islam