Welcome to the Treehouse Community

Want to collaborate on code errors? Have bugs you need feedback on? Looking for an extra set of eyes on your latest project? Get support with fellow developers, designers, and programmers of all backgrounds and skill levels here with the Treehouse Community! While you're at it, check out some resources Treehouse students have shared here.

Looking to learn something new?

Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and join thousands of Treehouse students and alumni in the community today.

Start your free trial

JavaScript Object-Oriented JavaScript (2015) Prototypal Inheritance Setting Up the Prototype Chain

Yonatan Medan
Yonatan Medan
3,943 Points
Posted by Yonatan Medan
Yonatan Medan
3,943 Points

why set the prototype chain like described in the video and not in this way?

this looks much simpler to me i saw it on codecademy 

// original classes
function Animal(name, numLegs) {
    this.name = name;
    this.numLegs = numLegs;
    this.isAlive = true;
}
function Penguin(name) {
    this.name = name;
    this.numLegs = 2;
}
function Emperor(name) {
    this.name = name;
    this.saying = "Waddle waddle";
}

// set up the prototype chain
Penguin.prototype = new Animal();
Emperor.prototype = new Penguin();

var myEmperor = new Emperor("Jules");

console.log(myEmperor.saying  ); // should print "Waddle waddle"
console.log(myEmperor.numLegs ); // should print 2
console.log(myEmperor.isAlive  ); // should print true