Public / private members on a "class" via the Pseudoclassical pattern using Prototypal Inheritance combined with the Revealing Module pattern - AKA a "revealing prototype pattern"

revealing-prototype-pattern.js

// constructor
function Person(name) {
	this.name = name;

	// etc... but no methods here
}


// prototype for all methods, using an IIFE with a returned object for 'public' methods
Person.prototype = (function() {

	// private properties and methods as needed
	// the "_" convention helps identify the members as "private"

	var _skillLevel = 0;

	var _privateMethod = function() {
		// do private stuff
		
	};

	// public methods
	var publicMethod = function() {
		// do public stuff
	};

	var increaseSkillLevel = function() {
		_skillLevel++;
	};

	var getSkillLevel = function() {
		return _skillLevel;
	};
	
        // expose public members via returned object, as in revealing module pattern
	return {
		publicMethod: publicMethod,
		increaseSkillLevel: increaseSkillLevel,
		getSkillLevel: getSkillLevel
	};
}());