An alternative to the Constructor/Prototype pattern typically seen in web applications: a basic module pattern returning an API. JSBin here: http://jsbin.com/nuqizaziko/edit?js,console

module-api.js

/** ****************************************
 * Module for say hi feature
 * @module sayHiFactory
 * @returns {object}
 */
function sayHiFactory() {
	var greeting = "Basic module says, 'hallo'!"
  
	function prvtWriteToConsole() {
		console.log(greeting);
	}
	function pblcSayHi() {
		privateWriteToConsole();
	}
	
	return {
		sayHi: pblcSayHi
	};
}
// module.exports = sayHiFactory();

/** 
 * Pros: no implicit environment, easier mental model, more flexibility left to implementation, no `new` needed
 * Cons: it's different? It's not what everyone else does?
 * 
 * Is it programming to an interface? Yup!
 * Is it composable? Yup!
 */