kotlin-stdlib / kotlin.collections / mutableSetOf

mutableSetOf

Common

JVM

Native

1.1

fun <T> mutableSetOf(): MutableSet<T>

Returns an empty new MutableSet.

The returned set preserves the element iteration order.

import kotlin.test.*

fun main(args: Array<String>) {
//sampleStart
val set = mutableSetOf<Int>()
println("set.isEmpty() is ${set.isEmpty()}") // true

set.add(1)
set.add(2)
set.add(1)

println(set) // [1, 2]
//sampleEnd
}

Common

JVM

Native

1.0

fun <T> mutableSetOf(vararg elements: T): MutableSet<T>

Returns a new MutableSet with the given elements. Elements of the set are iterated in the order they were specified.

import kotlin.test.*

fun main(args: Array<String>) {
//sampleStart
val set = mutableSetOf(1, 2, 3)
println(set) // [1, 2, 3]

set.remove(3)
set += listOf(4, 5)
println(set) // [1, 2, 4, 5]
//sampleEnd
}