Javascript: IIFE example...

1-iife.js

var GO = (function(go) {
	
	go = go || {};
	
	go.init = function(x) {
	   
	   console.log(x);
	   
	};
	
	go.hello = function(msg) {
	   
	   console.log('Hello: ' + msg);
	   
	};
	
	return go;
	
}(GO || {}));

GO.init('blah');

GO.hello('Billy');

2-iife-alt.js

var GO = (function(go) {
	
	// We've already determined if GO is defined, so no need to do the same thing here, right?
	
	go.init = function(x) {
	   
	   console.log(x);
	   
	};
	
	go.hello = function(msg) {
	   
	   console.log('Hello: ' + msg);
	   
	};
	
	return go;
	
}(GO || {})); // Pass GO if defined, otherwise pass empty object.

3-iife-new.js

var GO = (function(go) {
	
	go = go || {}; // Do our check here.
	
	go.init = function(x) {
	   
	   console.log(x);
	   
	};
	
	go.hello = function(msg) {
	   
	   console.log('Hello: ' + msg);
	   
	};
	
	return go;
	
}(GO)); // Cleaner! Thanks @preaction! :)

GO.init('blah');

GO.hello('Billy');

An awesome singleton example can be found here.