What is the best way to test if a CharacterSet contains a Character in Swift 4?
Swift 4.2
CharacterSet
extension function to check whether it contains Character
:
extension CharacterSet {
func containsUnicodeScalars(of character: Character) -> Bool {
return character.unicodeScalars.allSatisfy(contains(_:))
}
}
Usage example:
CharacterSet.decimalDigits.containsUnicodeScalars(of: "3") // true
CharacterSet.decimalDigits.containsUnicodeScalars(of: "a") // false
Not sure if it's the most efficient way but you can create a new CharSet and check if they are sub/super-sets (Set comparison is rather quick)
let newSet = CharacterSet(charactersIn: "a")
// let newSet = CharacterSet(charactersIn: "\(character)")
print(newSet.isSubset(of: CharacterSet.decimalDigits)) // false
print(newSet.isSubset(of: CharacterSet.alphanumerics)) // true