Swift operator `subscript` []

Question

I am beginner with the Swift having no advance knowledge with operators.

I have the following class

class Container {
   var list: [Any]         


        

Answer 1

It sounds like you are looking for subscripts. You can make subscripts for your own type like the following example:

class Container {
    var list = [["Hello", "World"], ["Foo", "Bar"]]

    subscript(index: Int) -> [String] {
        get {
            return list[index]
        }
        set {
            list.insert(newValue, atIndex: index)
        }
    }
}

The above example works with the double [ ] only because I know that we are going to return an Array. Here the Array contain Strings as an example, but you could of course swap in your own type

var container = Container()

container[0][0] = "Stack"
container[0][1] = "Overflow"

print(container[0][0]) // "Stack"
print(container[1][1]) // "Bar"