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

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/*
 * Copyright 2010-2016 JetBrains s.r.o.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

@file:kotlin.jvm.JvmMultifileClass
@file:kotlin.jvm.JvmName("ArraysKt")


package kotlin.collections

import java.util.*


/** Returns the array if it's not `null`, or an empty array otherwise. */
public inline fun  Array?.orEmpty(): Array = this ?: arrayOf()


/**
 * 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 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
}