String extension using swift

StringExtension.swift

extension String
{
    var length: Int {
        get {
            return self.count
        }
    }
    var startToEndRange: Range<String.Index> {
        get {
            let start = self.index(self.startIndex, offsetBy: 0)
            let end = self.index(self.startIndex, offsetBy: self.length)
            return start..<end
        }
    }
    
    func contains(s: String, option: String.CompareOptions) -> Bool {
        return (self.range(of: s, options: option, range: self.startToEndRange, locale: nil) != nil)
    }
    
    func replace(target: String, withReplaceString: String) -> String {
        return self.replacingOccurrences(of: target, with: withReplaceString, options: .literal, range: nil)
    }
    
    func trimWhiteSpace() -> String {
        return self.trimmingCharacters(in: .whitespaces)
    }
    
    func toDictionary() -> [String: Any] {
        if let data = self.data(using: .utf8) {
            do {
                return (try JSONSerialization.jsonObject(with: data, options: []) as? [String: Any])!
            } catch {
                print(error.localizedDescription)
            }
        }
        return [:]
    }
    
    func hostWithScheme() -> String {
        let url = URL.init(string: self)
        return "\(url!.scheme ?? "")://\(url!.host ?? "")"
    }
    
    func textSize(textFont: UIFont) -> CGSize {
        
        let fontAttributes = [NSAttributedStringKey.font: textFont]
        return (self as NSString).size(withAttributes: fontAttributes as [NSAttributedStringKey : Any])
    }
}



/* Output

let original = "original"
let duplicate = "orig"

print("Contains \(original.contains(s: duplicate, option: .caseInsensitive))")    // true
print("Replace \(original.replace(target: "gin", withReplaceString: "duplicate"))") // ori[duplicate]al

let original = "      original  "
let duplicate = "orig"

print("|\(original)|")                               //  |      original  |
print("|\(original.trimWhiteSpace())|")             //    |original|

let str = "{\"name\":\"James\"}"
let dict = str.toDictionary()
print("Dict \(dict)")                              // Dict ["name": James]

let urlString = "https://example.com/json/getToken"
print("Url \(urlString.hostWithScheme())")        // https://example.com

// button is an instance of UIButton and 
// button font font-family: ".SFUIText"; font-weight: normal; font-style: normal; font-size: 18.00pt
let size = title.textSize(textFont: (button.titleLabel?.font)!)
print(size) // (42.609375, 21.48046875)

*/