---
title: "characterIsMember(_:)"
framework: foundation
role: symbol
role_heading: Instance Method
path: "foundation/nscharacterset/characterismember(_:)"
---

# characterIsMember(_:)

Returns a Boolean value that indicates whether a given character is in the receiver.

## Declaration

```swift
func characterIsMember(_ aCharacter: unichar) -> Bool
```

## Parameters

- `aCharacter`: The character to test for membership of the receiver.

## Return Value

Return Value true if aCharacter is in the receiving character set, otherwise false.

## See Also

### Testing Set Membership

- [hasMemberInPlane(_:)](foundation/nscharacterset/hasmemberinplane(_:).md)
- [isSuperset(of:)](foundation/nscharacterset/issuperset(of:).md)
- [longCharacterIsMember(_:)](foundation/nscharacterset/longcharacterismember(_:).md)