Closure

//At the very beginning,
//I just wanna do something that I interested in.
(function(){
//do something
}());


//And Day by day,
//I wanna do something to change the world.
(function(global){
var newWorld={};
global=newWorld;

//change the world

global.hello_world='Hello New World!';

}(window));

//But no influences came.
console.log(window.hello_world);
//And I sank into depression.

//Someday,
//I found that I need not change the world or make something to replace it but to improve it.
//If it works,I reach my destination.
(function(global){

global.hello_world='Hello The Improved World!';

}(window));


//I hope it works someday.
console.log(window.hello_world);