JS : Difference between Object and Object.constructor

Question

I don't understand the difference between Object and Object.constructor.

Let's take an example :

function Person() {}
var p = new Person();

Person is the function to create objects. So :

p instanceof Person //true
p.constructor // Person

Person is the constructor and I can create persons with new Person()

But Object is also a constructor ( I can create object with new Object()). So why Object has a constructor property since it's already a constructor itself ?

Thanks

No the constructor has no constructor property, the instance constructed with the constructor has (inherits it from the prototype) — Jonas Wilms
– Jonas Wilms, Commented Jun 12, 2018 at 12:26
The Object() function does have a constructor property. But I don't know what it means — AntonBoarf
– AntonBoarf, Commented Jun 12, 2018 at 12:32
@JonasW. Person.constructor is inherited from Function.prototype as it is for all (constructor or not) functions — Bergi
– Bergi, Commented Jun 12, 2018 at 12:43

Bergi · Accepted Answer · 2018-06-12 12:45:50Z

2

So why does it have a constructor property since it's already a constructor itself?

Because every constructor is a function, and those inherit their properties (like the call, apply and bind methods) from Function.prototype. Including the Function.prototype.constructor property, which points to Function.

answered Jun 12, 2018 at 12:45

Bergi

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adz5A · Accepted Answer · 2018-06-12 12:28:32Z

-1

constructor is a pointer towards the constructor function used to create a given value, all objects have one. For primitives it points towards the primitive constructor: Object, Number, Function and so on.

Doc: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/constructor

answered Jun 12, 2018 at 12:28

adz5A

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