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Home/ Questions/Q 6989
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Alek Richter
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Alek RichterEnlightened
Asked: December 23, 20212021-12-23T08:05:13+00:00 2021-12-23T08:05:13+00:00

__proto__ VS. prototype in JavaScript

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This figure again shows that every object has a prototype. Constructor function Foo also has its own __proto__ which is Function.prototype, and which in turn also references via its __proto__ property again to the Object.prototype. Thus, repeat, Foo.prototype is just an explicit property of Foo which refers to the prototype of b and c objects.

var b = new Foo(20);
var c = new Foo(30);

What are the differences between __proto__ and prototype?

enter image description here

The figure was taken from dmitrysoshnikov.com.

Note: there is now a 2nd edition (2017) to the above 2010 article.

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  1. Alek Richter Enlightened
    2021-12-23T08:05:49+00:00Added an answer on December 23, 2021 at 8:05 am

    __proto__ is the actual object that is used in the lookup chain to resolve methods, etc. prototype is the object that is used to build __proto__ when you create an object with new:

    ( new Foo ).__proto__ === Foo.prototype;
    ( new Foo ).prototype === undefined;
    
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