kotlin-stdlib/kotlin.collections/flatten

flatten

fun <T> Array<out Array<out T>>.flatten(): List<T>

Returns a single list of all elements from all arrays in the given array.

Samples

import samples.*
import kotlin.test.*
fun main() { 
   //sampleStart 
   val deepArray = arrayOf(
    arrayOf(1),
    arrayOf(2, 3),
    arrayOf(4, 5, 6)
)

assertPrints(deepArray.flatten(), "[1, 2, 3, 4, 5, 6]") 
   //sampleEnd
}

fun <T> Iterable<Iterable<T>>.flatten(): List<T>

Returns a single list of all elements from all collections in the given collection.

Samples

import samples.*
fun main() { 
   //sampleStart 
   val deepList = listOf(listOf(1), listOf(2, 3), listOf(4, 5, 6))
assertPrints(deepList.flatten(), "[1, 2, 3, 4, 5, 6]") 
   //sampleEnd
}