In Kotlin, how to check contains one or another value?

Issue

In Kotlin we can do:

val arr = intArrayOf(1,2,3)
if (2 in arr)
   println("in list")

But if I want to check if 2 or 3 are in arr, what is the most idiomatic way to do it other than:

if (2 in arr || 3 in arr)
   println("in list")

Solution

I'd use any() extension method:

arrayOf(1, 2, 3).any { it == 2 || it == 3 }

This way, you traverse the array only once and you don't create a set instance just to check whether it's empty or not (like in one of other answers to this question).

Answered By - aga