This is a little bit confusing

Hello this challenge is really hard to understand can someone help me explaining it step by step

remember to set the constructor property when changing the prototype

The prototype property of a constructor function has a property called constructor which tells by which constructor a object was created.

consider a Dog() constructor.

function Dog(name) { = name;

its prototype will look something like

 constructor : Dog

by default

But if you manipulate the prototype like

Dog.prototype = {

  numLegs: 4,
  eat: function() {
    console.log("nom nom nom");
  describe: function() {
    console.log("My name is " +;

The constructor property will also be overwritten. So its prototype will look something like

 constructor : Object

To avoid this you have to manually set the constructor property

Dog.prototype.constructor = Dog

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