flatMapIndexed

Common
JVM
JS
Native
1.4
@JvmName ( "flatMapIndexedIterable" ) inline fun < T , R > Array < out T > . flatMapIndexed (
transform : ( index : Int , T ) -> Iterable < R >
) : List < R >

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@JvmName ( "flatMapIndexedIterable" ) inline fun < R > ByteArray . flatMapIndexed (
transform : ( index : Int , Byte ) -> Iterable < R >
) : List < R >

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@JvmName ( "flatMapIndexedIterable" ) inline fun < R > ShortArray . flatMapIndexed (
transform : ( index : Int , Short ) -> Iterable < R >
) : List < R >

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@JvmName ( "flatMapIndexedIterable" ) inline fun < R > IntArray . flatMapIndexed (
transform : ( index : Int , Int ) -> Iterable < R >
) : List < R >

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@JvmName ( "flatMapIndexedIterable" ) inline fun < R > LongArray . flatMapIndexed (
transform : ( index : Int , Long ) -> Iterable < R >
) : List < R >

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@JvmName ( "flatMapIndexedIterable" ) inline fun < R > FloatArray . flatMapIndexed (
transform : ( index : Int , Float ) -> Iterable < R >
) : List < R >

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@JvmName ( "flatMapIndexedIterable" ) inline fun < R > DoubleArray . flatMapIndexed (
transform : ( index : Int , Double ) -> Iterable < R >
) : List < R >

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@JvmName ( "flatMapIndexedIterable" ) inline fun < R > BooleanArray . flatMapIndexed (
transform : ( index : Int , Boolean ) -> Iterable < R >
) : List < R >

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@JvmName ( "flatMapIndexedIterable" ) inline fun < R > CharArray . flatMapIndexed (
transform : ( index : Int , Char ) -> Iterable < R >
) : List < R >

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@JvmName ( "flatMapIndexedSequence" ) inline fun < T , R > Array < out T > . flatMapIndexed (
transform : ( index : Int , T ) -> Sequence < R >
) : List < R >

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@ExperimentalUnsignedTypes inline fun < R > UIntArray . flatMapIndexed (
transform : ( index : Int , UInt ) -> Iterable < R >
) : List < R >

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@ExperimentalUnsignedTypes inline fun < R > ULongArray . flatMapIndexed (
transform : ( index : Int , ULong ) -> Iterable < R >
) : List < R >

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@ExperimentalUnsignedTypes inline fun < R > UByteArray . flatMapIndexed (
transform : ( index : Int , UByte ) -> Iterable < R >
) : List < R >

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@ExperimentalUnsignedTypes inline fun < R > UShortArray . flatMapIndexed (
transform : ( index : Int , 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 and its index in the original array.

import kotlin.test.*

fun main(args: Array<String>) {
//sampleStart
val data: List<String> = listOf("Abcd", "efgh", "Klmn")
val selected: List<Boolean> = data.map { it.any { c -> c.isUpperCase() } }
val result = data.flatMapIndexed { index, s -> if (selected[index]) s.toList() else emptyList() }
println(result) // [A, b, c, d, K, l, m, n]
//sampleEnd
}
Common
JVM
JS
Native
1.4
@JvmName ( "flatMapIndexedIterable" ) inline fun < T , R > Iterable < T > . flatMapIndexed (
transform : ( index : Int , T ) -> Iterable < R >
) : List < R >

(source)
@JvmName ( "flatMapIndexedSequence" ) inline fun < T , R > Iterable < T > . flatMapIndexed (
transform : ( index : Int , T ) -> Sequence < R >
) : List < R >

(source)

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

import kotlin.test.*

fun main(args: Array<String>) {
//sampleStart
val data: List<String> = listOf("Abcd", "efgh", "Klmn")
val selected: List<Boolean> = data.map { it.any { c -> c.isUpperCase() } }
val result = data.flatMapIndexed { index, s -> if (selected[index]) s.toList() else emptyList() }
println(result) // [A, b, c, d, K, l, m, n]
//sampleEnd
}