StringExtensions

StringExtensions.swift

extension String {
    func isContainedBy(set: CharacterSet) -> Bool {
        let letters = self.components(separatedBy: set)
        print(letters)
        return self.count == letters.count
    }
    
    func filtered(by set: CharacterSet) -> String {
        let chars = self.unicodeScalars.filter({ set.contains($0)})
        let unicode = UnicodeScalarView(chars)
        return String(unicode)
    }
    
        func trimEnd(while predicate: (Character) -> Bool) -> String {
        var newString = self
        while let lastChar = newString.last, predicate(lastChar) {
            newString = String(newString.dropLast())
        }

        return newString
    }

    func trimmingEndCharacters(in set: CharacterSet) -> String {
        let predicate: (Character) -> Bool = { char in !char.unicodeScalars.filter({ set.contains($0) }).isEmpty }
        return trimEnd(while: predicate)
    }
}