associateWithTo
inline fun <K, V, M : MutableMap<in K, in V>> Array<out K>.associateWithTo( destination: M, valueSelector: (K) -> V ): M
inline fun <V, M : MutableMap<in Byte, in V>> ByteArray.associateWithTo( destination: M, valueSelector: (Byte) -> V ): M
inline fun <V, M : MutableMap<in Short, in V>> ShortArray.associateWithTo( destination: M, valueSelector: (Short) -> V ): M
inline fun <V, M : MutableMap<in Int, in V>> IntArray.associateWithTo( destination: M, valueSelector: (Int) -> V ): M
inline fun <V, M : MutableMap<in Long, in V>> LongArray.associateWithTo( destination: M, valueSelector: (Long) -> V ): M
inline fun <V, M : MutableMap<in Float, in V>> FloatArray.associateWithTo( destination: M, valueSelector: (Float) -> V ): M
inline fun <V, M : MutableMap<in Double, in V>> DoubleArray.associateWithTo( destination: M, valueSelector: (Double) -> V ): M
inline fun <V, M : MutableMap<in Boolean, in V>> BooleanArray.associateWithTo( destination: M, valueSelector: (Boolean) -> V ): M
inline fun <V, M : MutableMap<in Char, in V>> CharArray.associateWithTo( destination: M, valueSelector: (Char) -> V ): M
@ExperimentalUnsignedTypes inline fun <V, M : MutableMap<in UInt, in V>> UIntArray.associateWithTo( destination: M, valueSelector: (UInt) -> V ): M
@ExperimentalUnsignedTypes inline fun <V, M : MutableMap<in ULong, in V>> ULongArray.associateWithTo( destination: M, valueSelector: (ULong) -> V ): M
@ExperimentalUnsignedTypes inline fun <V, M : MutableMap<in UByte, in V>> UByteArray.associateWithTo( destination: M, valueSelector: (UByte) -> V ): M
@ExperimentalUnsignedTypes inline fun <V, M : MutableMap<in UShort, in V>> UShortArray.associateWithTo( destination: M, valueSelector: (UShort) -> V ): M
Заполняет и возвращает изменяемую карту destination парами ключ-значение для каждого элемента заданного массива, где ключ — сам элемент, а значение предоставляется функцией valueSelector, применённой к этому ключу.
Если любые два элемента равны, последний из них перезаписывает предыдущее значение в карте.
import kotlin.test.*
fun main(args: Array<String>) {
//sampleStart
data class Person(val firstName: String, val lastName: String) {
override fun toString(): String = "$firstName $lastName"
}
val scientists = listOf(Person("Grace", "Hopper"), Person("Jacob", "Bernoulli"), Person("Jacob", "Bernoulli"))
val withLengthOfNames = mutableMapOf<Person, Int>()
println("withLengthOfNames.isEmpty() is ${withLengthOfNames.isEmpty()}") // true
scientists.associateWithTo(withLengthOfNames) { it.firstName.length + it.lastName.length }
println("withLengthOfNames.isNotEmpty() is ${withLengthOfNames.isNotEmpty()}") // true
// Jacob Bernoulli only occurs once in the map because only the last pair with the same key gets added
println(withLengthOfNames) // {Grace Hopper=11, Jacob Bernoulli=14}
//sampleEnd
}inline fun <K, V, M : MutableMap<in K, in V>> Iterable<K>.associateWithTo( destination: M, valueSelector: (K) -> V ): M
Заполняет и возвращает изменяемую карту destination парами ключ-значение для каждого элемента заданного набора, где ключ — сам элемент, а значение предоставляется функцией valueSelector, применённой к этому ключу.
Если любые два элемента равны, последний из них перезаписывает предыдущее значение в карте.
import kotlin.test.*
fun main(args: Array<String>) {
//sampleStart
data class Person(val firstName: String, val lastName: String) {
override fun toString(): String = "$firstName $lastName"
}
val scientists = listOf(Person("Grace", "Hopper"), Person("Jacob", "Bernoulli"), Person("Jacob", "Bernoulli"))
val withLengthOfNames = mutableMapOf<Person, Int>()
println("withLengthOfNames.isEmpty() is ${withLengthOfNames.isEmpty()}") // true
scientists.associateWithTo(withLengthOfNames) { it.firstName.length + it.lastName.length }
println("withLengthOfNames.isNotEmpty() is ${withLengthOfNames.isNotEmpty()}") // true
// Jacob Bernoulli only occurs once in the map because only the last pair with the same key gets added
println(withLengthOfNames) // {Grace Hopper=11, Jacob Bernoulli=14}
//sampleEnd
}
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Licensed under the Apache License, Version 2.0.
https://kotlinlang.org/api/latest/jvm/stdlib/kotlin.collections/associate-with-to.html