How to add a character at a particular index in string in Swift

Question

I have a string like this in Swift:

var stringts:String = \"3022513240\"

If I want to change it to string to something like this: \"(

Answer 1

You can't use in below Swift 2.0 because String stopped being a collection in Swift 2.0. but in Swift 3 / 4 is no longer necessary now that String is a Collection again. Use native approach of String,Collection.

var stringts:String = "3022513240"
let indexItem = stringts.index(stringts.endIndex, offsetBy: 0)
stringts.insert("0", at: indexItem)
print(stringts) // 30225132400