IIFE: Pros & Cons

In this article we spend some time to describe what is IIFE [ifi] and why each
Junior Developer should know this as quick as he can.

This is simple listing of JavaScript code:

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(function () {
    'use strict';

    function foo() {
        console.log('bar');
    }

    foo();
})();

You can see that the whole code is wrapped by a function in round brackets,
and immediately invoked with another pair of round brackets.

This syntax is called Immediately Invoke Function Expression - IIFE

Pros

• function wraps some code which could define variable, so it is defines in
  a local scope
• without any module definition variable define in global namespace,
  which is called anti-pattern

Cons

• each wrap generates indentation
• when project does not have any module

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