What is __proto__ ? | Javascript Prototypes Tutorial

What is __proto__ ? This Javascript prototypes tutorial will help you understand Javascript prototype inheritance and the prototype chain. Javascript prototypes are a popular interview question topic and what is "under the hood" of the modern syntactic sugar behind ES6 Classes.

What is __proto__ ? | Javascript Prototypes Tutorial

(00:00) Intro
(0:16) Good Reasons to know about Javascript Prototypes
(1:03) Hello __proto__
(2:59) New Modern Methods vs __proto__
(4:34) More than one link in the prototype chain
(8:11) 3 Rules of Prototypal Inheritance
(9:05) Inheriting a Getter and a Setter
(11:50) Inheriting from the Javascript Object
(13:34) Looping through direct and inherited keys
(14:56) Object Constructor Functions and Prototypes
(19:05) Javascript ES6 Classes and Extending Classes

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[mrinalroy]

Every video of Dave is a ton of clarity even for the concepts which are esoteric. Thank you Dave !

[kuehling]

I watched 6 or 7 videos on this, and this one was BY FAR the clearest. Such an excellent use of simple, relevant examples... and clear precise explanations of a topic that can be confusing. Before watching, why syntax differences in syntax - this video clarified there was an dated/current way to doing the exact same thing! Thank you so much!

[hosamgnaba]

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[konstantinospascal]

This topic finally clicked for me when I realized that "__proto__" and "prototype" are literally the same thing. We have the actual object constructs and then references to them making up the chain. But it's so tricky at first with these terms. Great video as always!

[tieTYT]

I don't stick to one programming language so I plan to come back to this video every time I need a refresher. Really well done. The pacing was great and it was comprehensive.

[juliettetworsey]

I needed a refresher on JS prototypes and this was the perfect explanation. Thanks!

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"I bet this guy is going to explain it in a way that makes sense to me" and I was right.

From one player to another. Thanks man.

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Only tutorial that enabled me to understand this. Thank you very much!

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[kostiantynkarzhanov]

Awesome! Thank you so much for this very well explained and easy to understand tutorial! 💛