JavaScript Module Pattern

gistfile1.js

// Setup a module and use immediate invocation to run it right away
var MyModule = function() {
	
	// Some private properties
	var foo = "1";
	var bar = 2;
	
	// A private function
	var updateFoo = function(value) {
		foo = value;
	};
	
	// Setup some public functions
	return {
		giveMeFoo : function() {
			return foo;
		},
		giveMeBar : function() {
			return bar;
		}
	};
}();

// Try to access the internal properties
console.log(MyModule.foo); // undefined
console.log(MyModule.bar); // undefined
MyModule.updateFoo(1); // Runtime error; MyModule.updateFoo is not a function

// Use the public accessors
console.log(MyModule.giveMeFoo()); // 1
console.log(MyModule.giveMeBar()); // 2