Filter non-digits from string

Question

Using only swift code I cant figure out how to take \"(555) 555-5555\" and return only the numeric values and get \"5555555555\". I need to remove all the parentheses, whit

Answer 1

I found the best solution with filter function. Please have a look into it.

let string = "(555) 555-5555"

let onlyDigits = string.filter({ (char) -> Bool in

    if Int("\(char)") != nil {

        return true
    }
    else {

        return false
    }

})