Prototype make parameter to False, js

Tell us what’s happening:

why in prototype(numLegs) isn’t in beagle? (console.log(beagle))

hasOwnProperty found only first object ? parameter numLegs=False, why?

Your code so far

function Dog(name) { = name;

Dog.prototype.numLegs = 4;

let beagle = new Dog("Snoopy");

let ownProps = [];
let prototypeProps = [];

// Only change code below this line

for( let property in beagle){
  else {


console.log(beagle);  //<---

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Challenge: Iterate Over All Properties

Link to the challenge:

I’m no expert, but …

Because this is the constructor:

function Dog(name) { = name;

That constructor is what is being called in this:

let beagle = new Dog("Snoopy");

This …

Dog.prototype.numLegs = 4;

… is changing the prototype but has not changed the constructor. If you check:

// {numLegs: 4, constructor: ƒ}

Notice that it is a sibling of the constructor, it didn’t change the constructor. If you want it to affect the instances, you’d have to change the constructor.

The hasOwnProperty() method returns a boolean indicating whether the object has the specified property as its own property (as opposed to inheriting it or having it delegated from prototype).

1 Like

so. it isnt’ added to function.
maybe other function check all(function and prototyp) and will return true

Thank You for answer.

Thank you for answer.