flatten

Common
JVM
JS
Native
1.0
fun <T> Sequence<Sequence<T>>.flatten(): Sequence<T>

Returns a sequence of all elements from all sequences in this sequence.

The operation is intermediate and stateless.

import kotlin.test.*

fun main(args: Array<String>) {
//sampleStart
val sequence: Sequence<Int> = generateSequence(1) { it + 1 }
val sequenceOfSequences: Sequence<Sequence<Int>> = sequence.map { number ->
    generateSequence { number }.take(number)
}

println(sequenceOfSequences.flatten().take(10).toList()) // [1, 2, 2, 3, 3, 3, 4, 4, 4, 4]
//sampleEnd
}
Common
JVM
JS
Native
1.0
@JvmName("flattenSequenceOfIterable") fun <T> Sequence<Iterable<T>>.flatten(): Sequence<T>

Returns a sequence of all elements from all iterables in this sequence.

The operation is intermediate and stateless.

import kotlin.test.*

fun main(args: Array<String>) {
//sampleStart
val sequence: Sequence<String> = sequenceOf("123", "45")
val sequenceOfLists: Sequence<List<Char>> = sequence.map { it.toList() }

println(sequenceOfLists.flatten().toList()) // [1, 2, 3, 4, 5]
//sampleEnd
}