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Introduction

In this article we will talk about one of the most discussed topics related to JavaScript — about closures. The topic, as a matter of fact, is not new and was discussed many times; there is a considerable quantity of articles devoted to this essence (some of them are very good, for example, article of Richard Cornford noted in the list of the additional literature), however we will try to discuss and understand it more from the theoretical point of view, and also will look on how closures are made in ECMAScript from within.

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Recently some JavaScript quizzes appear then and there with the competitive titles wondering whether “you know JavaScript”? The recent quizzes were by kangax, Dmitry Baranovskiy and by Nicholas C. Zakas. All that quizzes are interesting, many questions though are mostly theoretical rather than practical.

And again just for fun, I suggest another ECMAScript quiz. I won’t use some boring things such as “a+++b”; but I will more sophisticated Some interesting questions are collected from newsgroups, mailing lists, forums and from my own.

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