Swift. Replacing a variable's value using an extension function

Question

I want to make a function to change the original value of my variable. for example

class Something {
    var name:String = "   John Diggle   "
    name.trim()
    print(name)
    // prints out "   John Diggle   "

    // what I wanna do is to make it so that I don't do this
    name = name.trim()
    print(name)
    // prints out "John Diggle"
}




extension String {
   func trim() -> String{
       return self.stringByTrimmingCharactersInSet(NSCharacterSet.whitespaceAndNewlineCharacterSet())
   }
}

is there a way to change the value of a variable inside a function without doing name = name.trim() ?

Answer 1

Maybe something like this?

extension String {
    mutating func trim() {
        self = self.trimmingCharacters(in: CharacterSet.whitespacesAndNewlines)
    }
}

Then you can use it as name.trim()