Thank you for your clear and thorough summary. It's very helpful.

One suggestion about the Prototype Chain example. It would be more clear if use a different object to assign the prototype to the empty constructor other than "Guy". For me I was confused at the first time that why we need to assign the "Guy.prototype" if we have "Guy.apply" since "Guy" already have the aboutMe(). I commented out the 3 lines for Guy.prototype assignment, and it is still working.

Here is the testing code I use to understand the concept (I am using NGuy for the prototype assignment and Guy for constructor):

function Guy(name, awesome) {

this.name = name;

this.awesome = awesome;

}

function NGuy(name, awesome) {

this.name = name;

this.awesome = awesome;

//this.aboutMe = function() {

//return this.awesome ? "I'm awesome!" : "I'm lame :(";

//};

}

NGuy.prototype.aboutMe = function() {

return this.awesome ? "I'm awesome!" : "I'm lame :(";

};

//var guy1= new NGuy("Max",true);

//console.log(guy1.aboutMe());

function NewGuy() {

Guy.apply(this, arguments);

}

var ctor = function() {}; // empty constructor

ctor.prototype = NGuy.prototype;

NewGuy.prototype = new ctor();

NewGuy.prototype.shout = function() {

return "Aaaaaaahhhh";

}

var john = new NewGuy("New John", true);

console.log(john.aboutMe());

console.log(john.shout());

thanks for that, very helpful

Hopefully this gets updated with ES6 class syntax.

Thank you for this amazing summary on how create objects in JavaScript!

One of the better articles I've read on this subject, JavaScript rocks!

Very helpful-thanks!

Great stuff! It really helped me clear some doubts about constructor functions