swift - How to check is a string or number

Question

I have an array ["abc", "94761178","790"]

I want to iterate each and check is a String or an Integer?

How to check it ?

How to convert "123" to integer 123

Answer 1

Here is a small Swift version using String extension :

Swift 3/Swift 4 :

extension String  {
    var isNumber: Bool {
        return !isEmpty && rangeOfCharacter(from: CharacterSet.decimalDigits.inverted) == nil
    }
}

Swift 2 :

   extension String  {
        var isNumber : Bool {
            get{
                return !self.isEmpty && self.rangeOfCharacterFromSet(NSCharacterSet.decimalDigitCharacterSet().invertedSet) == nil
            }
        }
   }