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Inheritance and the prototype chain


Prototype based inheritance is not the weakness on it's own, it is the confusion in a world where most people learn programming with classical OO.

Introducing JavaScript objects


JavaScript/ECMAScript is prototype based and thus only object-based not object-oriented.

Indexed collections


Arrays index are numerical (non numerical are properties), while it is clarified later, it is important to give a good hint at the start as well.

Numbers and dates


Mention What Jan, 1, 1970, 00:00:00 is all about: Unix Timestamp.

Functions


Fix typo, avoid giving the impression of security in closure vars.