System.Collections.Immutable by Microsoft

<PackageReference Include="System.Collections.Immutable" Version="8.0.0-preview.2.23128.3" />

.NET API 245,424 bytes

 IImmutableSet<T>

public interface IImmutableSet<T> : IReadOnlyCollection<T>, IEnumerable<T>, IEnumerable
A set of elements that can only be modified by creating a new instance of the set.
IImmutableSet<T> Add(T value)

Adds the specified value to this set.

IImmutableSet<T> Clear()

Gets an empty set that retains the same sort or unordered semantics that this instance has.

bool Contains(T value)

Determines whether this set contains the specified value.

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

Removes a given set of items from this set.

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

Produces a set that contains elements that exist in both this set and the specified set.

bool IsProperSubsetOf(IEnumerable<T> other)

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

bool IsProperSupersetOf(IEnumerable<T> other)

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

bool IsSubsetOf(IEnumerable<T> other)

Determines whether a set is a subset of a specified collection.

bool IsSupersetOf(IEnumerable<T> other)

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

bool Overlaps(IEnumerable<T> other)

Determines whether the current set overlaps with the specified collection.

IImmutableSet<T> Remove(T value)

Removes the specified value from this set.

bool SetEquals(IEnumerable<T> other)

Checks whether a given sequence of items entirely describe the contents of this set.

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

Produces a set that contains elements either in this set or a given sequence, but not both.

bool TryGetValue(T equalValue, out T actualValue)

Searches the set for a given value and returns the equal value it finds, if any.

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

Adds a given set of items to this set.