Welcome to the Treehouse Community

The Treehouse Community is a meeting place for developers, designers, and programmers of all backgrounds and skill levels to get support. Collaborate here on code errors or bugs that you need feedback on, or asking for an extra set of eyes on your latest project. Join thousands of Treehouse students and alumni in the community today. (Note: Only Treehouse students can comment or ask questions, but non-students are welcome to browse our conversations.)

Looking to learn something new?

Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and a supportive community. Start your free trial today.

JavaScript Object-Oriented JavaScript (2015) Constructor Functions and Prototypes Adding a Prototype

Anusha Singh
PLUS
Anusha Singh
Courses Plus Student 22,106 Points
Posted by Anusha Singh
Anusha Singh
Courses Plus Student 22,106 Points

Can you help me with this??

I typed this but it still isn't working function Monster(name) { this.name = name; this.health = 100;

} Monster.prototype.Damage= function() { this.health--; }

monster.js 
function Monster(name) {
  this.name = name;
  this.health = 100;

}
Monster.prototype.Damage= function() {
    this.health--;
  }

2 Answers

alastair cooper
alastair cooper
28,199 Points
alastair cooper
alastair cooper
28,199 Points

call the function 'takeDamage' instead of 'Damage'

Matthew Furness
Matthew Furness
7,657 Points
Matthew Furness
Matthew Furness
7,657 Points

How are you calling the Damage function?

You need to call it on an instance of the Monster object which you'd create like this

var fred = new Monster("fred");

you'd then call the function by doing

fred.Damage();

I've just run the code in the console and fred's health after the function call is 99 as you would expect so your code is right. You just need to make sure you're calling the function properly.