The first thing you often hear when talking about JavaScript is often “JavaScript doesn’t have visibility modifiers, hence it doesn’t support private variables”. This is only valid for 50%, because JavaScript indeed doesn’t have visibility modifiers (public, private, friend) but it has closures and function scopes. With these tools we can make variables private. Let’s take the following function:var names = ["Kenneth", "John", "Marc", "Robert"];var lookup = function (index) { return names[index];}alert(lookup(0));As you can see the variable “names&r...