kotlin-stdlib/kotlin.collections/map

map

inline fun <T, R> Array<out T>.map(transform: (T) -> R): List<R>(source)
inline fun <R> ByteArray.map(transform: (Byte) -> R): List<R>(source)
inline fun <R> ShortArray.map(transform: (Short) -> R): List<R>(source)
inline fun <R> IntArray.map(transform: (Int) -> R): List<R>(source)
inline fun <R> LongArray.map(transform: (Long) -> R): List<R>(source)
inline fun <R> FloatArray.map(transform: (Float) -> R): List<R>(source)
inline fun <R> DoubleArray.map(transform: (Double) -> R): List<R>(source)
inline fun <R> BooleanArray.map(transform: (Boolean) -> R): List<R>(source)
inline fun <R> CharArray.map(transform: (Char) -> R): List<R>(source)

Returns a list containing the results of applying the given transform function to each element in the original array.

Since Kotlin

1.0

Samples

import kotlin.test.*

fun main() { 
   //sampleStart 
   val numbers = listOf(1, 2, 3)
println(numbers.map { it * it }) // [1, 4, 9] 
   //sampleEnd
}
inline fun <T, R> Iterable<T>.map(transform: (T) -> R): List<R>(source)

Returns a list containing the results of applying the given transform function to each element in the original collection.

Since Kotlin

1.0

Samples

import kotlin.test.*

fun main() { 
   //sampleStart 
   val numbers = listOf(1, 2, 3)
println(numbers.map { it * it }) // [1, 4, 9] 
   //sampleEnd
}
inline fun <K, V, R> Map<out K, V>.map(transform: (Map.Entry<K, V>) -> R): List<R>(source)

Returns a list containing the results of applying the given transform function to each entry in the original map.

Since Kotlin

1.0

Samples

import kotlin.test.*
import java.util.*

fun main() { 
   //sampleStart 
   val peopleToAge = mapOf("Alice" to 20, "Bob" to 21)
println(peopleToAge.map { (name, age) -> "$name is $age years old" }) // [Alice is 20 years old, Bob is 21 years old]
println(peopleToAge.map { it.value }) // [20, 21] 
   //sampleEnd
}