Instance Method

isSubset(of:)

Returns a Boolean value that indicates whether the set is a subset of another set.

Declaration

func isSubset(of other: IndexSet) -> Bool

Parameters

other

A set of the same type as the current set.

Return Value

true if the set is a subset of other; otherwise, false.

Discussion

Set A is a subset of another set B if every member of A is also a member of B.

let employees: Set = ["Alicia", "Bethany", "Chris", "Diana", "Eric"]
let attendees: Set = ["Alicia", "Bethany", "Diana"]
print(attendees.isSubset(of: employees))
// Prints "true"

See Also

Testing Set Membership

func contains(IndexSet.Element) -> Bool

Returns true if self contains integer.

func contains(integersIn: IndexSet) -> Bool

Returns true if self contains all of the integers in indexSet.

func contains(integersIn: Range<IndexSet.Element>) -> Bool

Returns true if self contains all of the integers in range.

func contains(where: (Int) -> Bool) -> Bool

Returns a Boolean value indicating whether the sequence contains an element that satisfies the given predicate.

func intersects(integersIn: Range<IndexSet.Element>) -> Bool

Returns true if self intersects any of the integers in range.

func starts<PossiblePrefix>(with: PossiblePrefix) -> Bool

Returns a Boolean value indicating whether the initial elements of the sequence are the same as the elements in another sequence.

func isDisjoint(with: IndexSet) -> Bool

Returns a Boolean value that indicates whether the set has no members in common with the given set.

func isStrictSubset(of: IndexSet) -> Bool

Returns a Boolean value that indicates whether this set is a strict subset of the given set.

func isStrictSuperset(of: IndexSet) -> Bool

Returns a Boolean value that indicates whether this set is a strict superset of the given set.

func isSuperset(of: IndexSet) -> Bool

Returns a Boolean value that indicates whether the set is a superset of the given set.