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| func isValidNumeral(input4: String) -> Bool { | |
| let numbers = CharacterSet.decimalDigits | |
| let rangeOfInvalidCharacters = input4.rangeOfCharacter(from: numbers.inverted) | |
| return rangeOfInvalidCharacters == nil | |
| } | |
| let string1 = "qwerty12345" | |
| let string2 = "qwerty" | |
| let string3 = "12345" | |
| print("\"\(string1)\" only contains numbers: \(isValidNumeral(input4: string1))") | |
| /// "qwerty12345" only contains numbers: false | |
| print("\"\(string2)\" only contains numbers: \(isValidNumeral(input4: string2))") | |
| /// "qwerty" only contains numbers: false | |
| print("\"\(string3)\" only contains numbers: \(isValidNumeral(input4: string3))") | |
| /// "12345" only contains numbers: true |
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