setOf

fun <T> setOf(vararg elements: T): Set<T>

Returns a new read-only set with the given elements. Elements of the set are iterated in the order they were specified. The returned set is serializable (JVM).

Samples

import samples.*
import kotlin.test.*
fun main() { 
   //sampleStart 
   val set1 = setOf(1, 2, 3)
val set2 = setOf(3, 2, 1)

// setOf preserves the iteration order of elements
assertPrints(set1, "[1, 2, 3]")
assertPrints(set2, "[3, 2, 1]")

// but the sets with the same elements are equal no matter of order
assertTrue(set1 == set2) 
   //sampleEnd
}

inline fun <T> setOf(): Set<T>

Returns an empty read-only set. The returned set is serializable (JVM).

Samples

import samples.*
import kotlin.test.*
fun main() { 
   //sampleStart 
   val set = setOf<String>()
assertTrue(set.isEmpty())

// another way to create an empty set,
// type parameter is inferred from the expected type
val other: Set<Int> = emptySet()

assertTrue(set == other, "Empty sets are equal")
assertPrints(set, "[]") 
   //sampleEnd
}