kotlin-stdlib/kotlin.collections/[JS]Set

Set

A generic unordered collection of elements that does not support duplicate elements. Methods in this interface support only read-only access to the set; read/write access is supported through the MutableSet interface.

Parameters

the type of elements contained in the set. The set is covariant in its element type.

Functions

contains

abstract operator override fun contains(element: @UnsafeVariance E): Boolean

Checks if the specified element is contained in this collection.

containsAll

abstract override fun containsAll(elements: Collection<@UnsafeVariance E>): Boolean

Checks if all elements in the specified collection are contained in this collection.

isEmpty

abstract override fun isEmpty(): Boolean

Returns true if the collection is empty (contains no elements), false otherwise.

iterator

abstract operator override fun iterator(): Iterator<E>

Returns an iterator over the elements of this object.

Properties

size

abstract override val size: Int

Returns the size of the collection.

Inheritors

AbstractSet

MutableSet

Extensions

minus

operator fun <T> Set<T>.minus(element: T): Set<T>

Returns a set containing all elements of the original set except the given element.

operator fun <T> Set<T>.minus(elements: Array<out T>): Set<T>

Returns a set containing all elements of the original set except the elements contained in the given elements array.

operator fun <T> Set<T>.minus(elements: Iterable<T>): Set<T>

Returns a set containing all elements of the original set except the elements contained in the given elements collection.

operator fun <T> Set<T>.minus(elements: Sequence<T>): Set<T>

Returns a set containing all elements of the original set except the elements contained in the given elements sequence.

minusElement

inline fun <T> Set<T>.minusElement(element: T): Set<T>

Returns a set containing all elements of the original set except the given element.

orEmpty

inline fun <T> Set<T>?.orEmpty(): Set<T>

Returns this Set if it's not null and the empty set otherwise.

plus

operator fun <T> Set<T>.plus(element: T): Set<T>

Returns a set containing all elements of the original set and then the given element if it isn't already in this set.

operator fun <T> Set<T>.plus(elements: Array<out T>): Set<T>

Returns a set containing all elements of the original set and the given elements array, which aren't already in this set.

operator fun <T> Set<T>.plus(elements: Iterable<T>): Set<T>

Returns a set containing all elements of the original set and the given elements collection, which aren't already in this set. The returned set preserves the element iteration order of the original set.

operator fun <T> Set<T>.plus(elements: Sequence<T>): Set<T>

Returns a set containing all elements of the original set and the given elements sequence, which aren't already in this set.

plusElement

inline fun <T> Set<T>.plusElement(element: T): Set<T>

Returns a set containing all elements of the original set and then the given element if it isn't already in this set.