---
title: "isSubset(of:)"
framework: swift
role: symbol
role_heading: Instance Method
path: "swift/set/issubset(of:)-1d7pp"
---

# isSubset(of:)

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

## Declaration

```swift
func isSubset(of other: Set<Element>) -> Bool
```

## Parameters

- `other`: Another set.

## Return Value

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

## Discussion

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

### Comparing Sets

- [==(_:_:)](swift/set/==(_:_:).md)
- [!=(_:_:)](swift/set/!=(_:_:).md)
- [isSubset(of:)](swift/set/issubset(of:)-6qyo5.md)
- [isStrictSubset(of:)](swift/set/isstrictsubset(of:)-96vc3.md)
- [isStrictSubset(of:)](swift/set/isstrictsubset(of:)-787sx.md)
- [isSuperset(of:)](swift/set/issuperset(of:)-9iz62.md)
- [isSuperset(of:)](swift/set/issuperset(of:)-90hri.md)
- [isStrictSuperset(of:)](swift/set/isstrictsuperset(of:)-4d27m.md)
- [isStrictSuperset(of:)](swift/set/isstrictsuperset(of:)-58ejg.md)
- [isDisjoint(with:)](swift/set/isdisjoint(with:)-8ngmk.md)
- [isDisjoint(with:)](swift/set/isdisjoint(with:)-2onid.md)