flatMap

Common
JVM
JS
Native
1.0
inline fun < T , R > Array < out T > . flatMap (
transform : ( T ) -> Iterable < R >
) : List < R >

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inline fun < R > ByteArray . flatMap (
transform : ( Byte ) -> Iterable < R >
) : List < R >

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inline fun < R > ShortArray . flatMap (
transform : ( Short ) -> Iterable < R >
) : List < R >

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inline fun < R > IntArray . flatMap (
transform : ( Int ) -> Iterable < R >
) : List < R >

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inline fun < R > LongArray . flatMap (
transform : ( Long ) -> Iterable < R >
) : List < R >

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inline fun < R > FloatArray . flatMap (
transform : ( Float ) -> Iterable < R >
) : List < R >

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inline fun < R > DoubleArray . flatMap (
transform : ( Double ) -> Iterable < R >
) : List < R >

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inline fun < R > BooleanArray . flatMap (
transform : ( Boolean ) -> Iterable < R >
) : List < R >

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inline fun < R > CharArray . flatMap (
transform : ( Char ) -> Iterable < R >
) : List < R >

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@JvmName ( "flatMapSequence" ) inline fun < T , R > Array < out T > . flatMap (
transform : ( T ) -> Sequence < R >
) : List < R >

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@ExperimentalUnsignedTypes inline fun < R > UIntArray . flatMap (
transform : ( UInt ) -> Iterable < R >
) : List < R >

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@ExperimentalUnsignedTypes inline fun < R > ULongArray . flatMap (
transform : ( ULong ) -> Iterable < R >
) : List < R >

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@ExperimentalUnsignedTypes inline fun < R > UByteArray . flatMap (
transform : ( UByte ) -> Iterable < R >
) : List < R >

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@ExperimentalUnsignedTypes inline fun < R > UShortArray . flatMap (
transform : ( UShort ) -> Iterable < R >
) : List < R >

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Returns a single list of all elements yielded from results of transform function being invoked on each element of original array.

import kotlin.test.*

fun main(args: Array<String>) {
//sampleStart
val list = listOf("123", "45")
println(list.flatMap { it.toList() }) // [1, 2, 3, 4, 5]
//sampleEnd
}
Common
JVM
JS
Native
1.0
inline fun < T , R > Iterable < T > . flatMap (
transform : ( T ) -> Iterable < R >
) : List < R >

(source)
@JvmName ( "flatMapSequence" ) inline fun < T , R > Iterable < T > . flatMap (
transform : ( T ) -> Sequence < R >
) : List < R >

(source)

Returns a single list of all elements yielded from results of transform function being invoked on each element of original collection.

import kotlin.test.*

fun main(args: Array<String>) {
//sampleStart
val list = listOf("123", "45")
println(list.flatMap { it.toList() }) // [1, 2, 3, 4, 5]
//sampleEnd
}
Common
JVM
JS
Native
1.0
inline fun < K , V , R > Map < out K , V > . flatMap (
transform : ( Entry < K , V > ) -> Iterable < R >
) : List < R >

(source)

Returns a single list of all elements yielded from results of transform function being invoked on each entry of original map.

import kotlin.test.*
import java.util.*

fun main(args: Array<String>) {
//sampleStart
val map = mapOf("122" to 2, "3455" to 3)
println(map.flatMap { (key, value) -> key.take(value).toList() }) // [1, 2, 3, 4, 5]
//sampleEnd
}
Common
JVM
JS
Native
1.4
@JvmName ( "flatMapSequence" ) inline fun < K , V , R > Map < out K , V > . flatMap (
transform : ( Entry < K , V > ) -> Sequence < R >
) : List < R >

(source)

Returns a single list of all elements yielded from results of transform function being invoked on each entry of original map.

import kotlin.test.*

fun main(args: Array<String>) {
//sampleStart
val list = listOf("123", "45")
println(list.flatMap { it.toList() }) // [1, 2, 3, 4, 5]
//sampleEnd
}