That's it. This is often called the module pattern. It's often used to avoid polluting the global scope with variables, e.g. (function() { var x = 1; console.l

That's it. This is often called the module pattern. It's often used to avoid polluting the global scope with variables, e.g. (function() { var x = 1; console.log(x); })(); console.log(x); Would output: 1 undefined