mapOf
Returns a new read-only map with the specified contents, given as a list of pairs where the first value is the key and the second is the value.
If multiple pairs have the same key, the resulting map will contain the value from the last of those pairs.
Entries of the map are iterated in the order they were specified.
The returned map is serializable (JVM).
Since Kotlin
1.0Samples
import kotlin.test.*
import java.util.*
fun main() {
//sampleStart
val map = mapOf(1 to "x", 2 to "y", -1 to "zz")
println(map) // {1=x, 2=y, -1=zz}
//sampleEnd
}
Returns an empty read-only map.
The returned map is serializable (JVM).
Since Kotlin
1.0Samples
import kotlin.test.*
import java.util.*
fun main() {
//sampleStart
val map = emptyMap<String, Int>()
println("map.isEmpty() is ${map.isEmpty()}") // true
val anotherMap = mapOf<String, Int>()
// "Empty maps are equal"
println("map == anotherMap is ${map == anotherMap}") // true
//sampleEnd
}
Returns a new read-only map, mapping only the specified key to the specified value.
The returned map is serializable (JVM).
Since Kotlin
1.9Samples
import kotlin.test.*
import java.util.*
fun main() {
//sampleStart
val map = mapOf(1 to "x", 2 to "y", -1 to "zz")
println(map) // {1=x, 2=y, -1=zz}
//sampleEnd
}
Returns a new read-only map, mapping only the specified key to the specified value.
Since Kotlin
1.1Samples
import kotlin.test.*
import java.util.*
fun main() {
//sampleStart
val map = mapOf(1 to "x", 2 to "y", -1 to "zz")
println(map) // {1=x, 2=y, -1=zz}
//sampleEnd
}
Returns a new read-only map, mapping only the specified key to the specified value.
The returned map is serializable.
Since Kotlin
1.0Samples
import kotlin.test.*
import java.util.*
fun main() {
//sampleStart
val map = mapOf(1 to "x", 2 to "y", -1 to "zz")
println(map) // {1=x, 2=y, -1=zz}
//sampleEnd
}
Returns a new read-only map, mapping only the specified key to the specified value.
Since Kotlin
1.9Samples
import kotlin.test.*
import java.util.*
fun main() {
//sampleStart
val map = mapOf(1 to "x", 2 to "y", -1 to "zz")
println(map) // {1=x, 2=y, -1=zz}
//sampleEnd
}
Returns a new read-only map, mapping only the specified key to the specified value.
Since Kotlin
1.9Samples
import kotlin.test.*
import java.util.*
fun main() {
//sampleStart
val map = mapOf(1 to "x", 2 to "y", -1 to "zz")
println(map) // {1=x, 2=y, -1=zz}
//sampleEnd
}
Returns a new read-only map, mapping only the specified key to the specified value.
Since Kotlin
1.9Samples
import kotlin.test.*
import java.util.*
fun main() {
//sampleStart
val map = mapOf(1 to "x", 2 to "y", -1 to "zz")
println(map) // {1=x, 2=y, -1=zz}
//sampleEnd
}