Arrays are much asic than the collection types. They don’t support resizing, are always mutable, and overwrite values in the array instead of making room for them.

fun displayAges(ages: IntArray){ ... }

val ages = intArrayOf(18,21,16,30)
displayAges(ages)

// Converting listOf

val ages = listOf(18,21,16,30)
displayAges(ages.toIntArray())

💡 Array compiles to a primitive array that holds any reference type.