JavaScript global variables & self-invoking anonymous functions

Question

So I\'ve been reading through Javascript - The Good Parts and one thing that Crockford points out is the use weakness of global variables in Javascript, in such a way that if yo

Answer 1

Making it a global function is not the answer. Why wouldn't you do this? This keeps x out of the global namespace.

(function () {
    var x = 'meh';
    alert(typeof x);  //string
})();

Answer 2

To create applications with javascript, you must attempt to keep variables in a local scope, and anything inside a namespace. It's a good pratice and prevent a serie of harm codes and unespected behaviors.

read this

it's a article talking about the vantages of doing that.

Answer 3

That's a perfectly legal way of doing things -- the variables inside of your function (as long as they are prefaced by var) are local to the function. It's called the module pattern, and it's very well accepted.

Answer 4

(function (global) {
    global.x = 'meh';
})(window);
(function () {
    alert(typeof x); // string
})();