kotlin-stdlib/kotlin.collections/flatten

flatten

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

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

Since Kotlin

1.0

Samples

import kotlin.test.*

fun main() { 
   //sampleStart 
   val deepArray = arrayOf(
    arrayOf(1),
    arrayOf(2, 3),
    arrayOf(4, 5, 6)
)

println(deepArray.flatten()) // [1, 2, 3, 4, 5, 6] 
   //sampleEnd
}
fun <T> Iterable<Iterable<T>>.flatten(): List<T>(source)

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

Since Kotlin

1.0

Samples


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