Contents

isSubset(of:)

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

Declaration

func isSubset<S>(of possibleSuperset: S) -> Bool where Element == S.Element, S : Sequence

Parameters

  • possibleSuperset:

    A sequence of elements. possibleSuperset must be finite.

Return Value

true if the set is a subset of possibleSuperset; 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 = ["Alicia", "Bethany", "Chris", "Diana", "Eric"]
let attendees: Set = ["Alicia", "Bethany", "Diana"]
print(attendees.isSubset(of: employees))
// Prints "true"

See Also

Comparing Sets