JavaScript. The Core: 2nd Edition

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Read this article in: Russian, German.

This is the second edition of the JavaScript. The Core overview lecture, devoted to ECMAScript programming language and core components of its runtime system.

Note: see also Essentials of Interpretation course, where we build a programming language similar to JavaScript, from scratch.

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ECMA-262-5 in detail. Chapter 3.1. Lexical environments: Common Theory.


In this chapter we’ll talk in detail about lexical environments — a mechanism used in some languages to manage the static scoping. In order to understand this concept completely, we’ll also discuss briefly the alternative — dynamic scoping (which though isn’t used directly in ECMAScript). We’ll see how environments help to manage lexically nested structures of a code and to provide complete support of closures. Continue reading

ECMA-262-3 in detail. Chapter 6. Closures.

Read this article in: Russian, French.


In this article we will talk about one of the most discussed topics related to JavaScript — about closures. The topic in fact is not new, and was discussed many times. However we will try to discuss and understand it more from a theoretical perspective, and also will look at how closures are implemented in ECMAScript.
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Тонкости ECMA-262-3. Часть 6. Замыкания.

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В этой заметке мы поговорим об одной из наиболее обсуждаемых тем, связанных с JavaScript — о замыканиях. Тема, по сути, избита; существует немалое количество статей, посвящённых этой структуре (некоторые из них очень хорошие, например, статья R. Cornford-a, представленная в списке дополнительной литературы), однако мы постараемся разобрать её более с теоретической точки зрения, и посмотрим, как замыкания в ECMAScript устроены изнутри.
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