Ilya Gorbunov
35 lines
808 B
Kotlin
35 lines
808 B
Kotlin
package kotlin
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import java.util.ArrayList
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import kotlin.platform.platformName
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/**
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* Returns a single list of all elements from all collections in the given collection.
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*/
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public fun <T> Iterable<Iterable<T>>.flatten(): List<T> {
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val result = ArrayList<T>()
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for (element in this) {
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result.addAll(element)
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}
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return result
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}
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/**
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* Returns a sequence of all elements from all sequences in this sequence.
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*/
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public fun <T> Sequence<Sequence<T>>.flatten(): Sequence<T> {
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return MultiSequence(this)
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}
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/**
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* Returns a single list of all elements from all arrays in the given array.
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*/
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public fun <T> Array<Array<out T>>.flatten(): List<T> {
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val result = ArrayList<T>(sumBy { it.size() })
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for (element in this) {
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result.addAll(element)
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}
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return result
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}
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