System.Collections.Immutable by Microsoft

<PackageReference Include="System.Collections.Immutable" Version="5.0.0-preview.4.20251.6" />

.NET API 188,792 bytes

 IImmutableSet<T>

public interface IImmutableSet<T> : IReadOnlyCollection<T>, IEnumerable<T>, IEnumerable
Represents a set of elements that can only be modified by creating a new instance of the set. NuGet package: System.Collections.Immutable (about immutable collections and how to install)
IImmutableSet<T> Add(T value)

Adds the specified element to this immutable set.

IImmutableSet<T> Clear()

Retrieves an empty immutable set that has the same sorting and ordering semantics as this instance.

bool Contains(T value)

Determines whether this immutable set contains a specified element.

IImmutableSet<T> Except(IEnumerable<T> other)

Removes the elements in the specified collection from the current immutable set.

IImmutableSet<T> Intersect(IEnumerable<T> other)

Creates an immutable set that contains only elements that exist in this set and the specified set.

bool IsProperSubsetOf(IEnumerable<T> other)

Determines whether the current immutable set is a proper (strict) subset of the specified collection.

bool IsProperSupersetOf(IEnumerable<T> other)

Determines whether the current immutable set is a proper (strict) superset of the specified collection.

bool IsSubsetOf(IEnumerable<T> other)

Determines whether the current immutable set is a subset of a specified collection.

bool IsSupersetOf(IEnumerable<T> other)

Determines whether the current immutable set is a superset of a specified collection.

bool Overlaps(IEnumerable<T> other)

Determines whether the current immutable set overlaps with the specified collection.

IImmutableSet<T> Remove(T value)

Removes the specified element from this immutable set.

bool SetEquals(IEnumerable<T> other)

Determines whether the current immutable set and the specified collection contain the same elements.

IImmutableSet<T> SymmetricExcept(IEnumerable<T> other)

Creates an immutable set that contains only elements that are present either in the current set or in the specified collection, but not both.

bool TryGetValue(T equalValue, out T actualValue)

Determines whether the set contains a specified value.

IImmutableSet<T> Union(IEnumerable<T> other)

Creates a new immutable set that contains all elements that are present in either the current set or in the specified collection.