kotlin.collections.Operations.kt Maven / Gradle / Ivy

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package kotlin

import java.util.ArrayList
import kotlin.platform.platformName

/**
 * Returns a single list of all elements from all collections in the given collection.
 */
public fun  Iterable>.flatten(): List {
    val result = ArrayList()
    for (element in this) {
        result.addAll(element)
    }
    return result
}

/**
 * Returns a sequence of all elements from all sequences in this sequence.
 */
public fun  Sequence>.flatten(): Sequence {
    return MultiSequence(this)
}

/**
 * Returns a single list of all elements from all arrays in the given array.
 */
public fun  Array>.flatten(): List {
    val result = ArrayList(sumBy { it.size() })
    for (element in this) {
        result.addAll(element)
    }
    return result
}

/**
 * Returns a pair of lists, where
 * *first* list is built from the first values of each pair from this collection,
 * *second* list is built from the second values of each pair from this collection.
 */
public fun  Iterable>.unzip(): Pair, List> {
    val expectedSize = collectionSizeOrDefault(10)
    val listT = ArrayList(expectedSize)
    val listR = ArrayList(expectedSize)
    for (pair in this) {
        listT.add(pair.first)
        listR.add(pair.second)
    }
    return listT to listR
}

/**
 * Returns a pair of lists, where
 * *first* list is built from the first values of each pair from this array,
 * *second* list is built from the second values of each pair from this array.
 */
public fun  Array>.unzip(): Pair, List> {
    val listT = ArrayList(size())
    val listR = ArrayList(size())
    for (pair in this) {
        listT.add(pair.first)
        listR.add(pair.second)
    }
    return listT to listR
}

/**
 * Returns a pair of lists, where
 * *first* list is built from the first values of each pair from this sequence,
 * *second* list is built from the second values of each pair from this sequence.
 */
public fun  Sequence>.unzip(): Pair, List> {
    val listT = ArrayList()
    val listR = ArrayList()
    for (pair in this) {
        listT.add(pair.first)
        listR.add(pair.second)
    }
    return listT to listR
}