Question

How to convert a 2D list to a 1D list in Kotlin

Answer 1

fun main() {
    val list2D = listOf(
        listOf(5, 6, 1, 8),
        listOf(3, 2, 0, 4),
        listOf(9, 8, 7, 6)
    )

    val list1D: IntArray = list2D.flatten().toIntArray()
    
    println(list1D.contentToString())
}
 

 
/*
run:

[5, 6, 1, 8, 3, 2, 0, 4, 9, 8, 7, 6]
 
*/

 

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