Asking for Object oriented programming prototype

Dear all,
I am Trong Anh and I am learning javascript object-oriented prototype.I have read your articles but I’m not sure how I get it.
Here is my code:
Thank you.

Just a heads up - that link just shows us the challenge, not what you have tried.

Dear Bob Smith,
I’m gonna give you my code.
function Dog(name,numLegs) { = name;
this.numLegs = numLegs;

// Add your code above this line
let beagle = new Dog(“Snoopy”);
beagle.prototype.numLegs = 4;

have you seen this line?

plus, you need to this:

Add a numLegs property to the prototype of Dog