Note 4. Two words about “hoisting”.

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My recent playground was the toy Scheme interpreter written in CoffeeScript. In the chapter of the metacircular evaluator of the SICP book, there is a section — 4.1.6 Internal Definitions suggesting to solve one interesting and subtle issue related to the (inner) definitions of functions. Continue reading →

Note 3. CoffeeScript. Scheme on Coffee.

After the recent ECMAScript article on lexical environments, I wanted to provide some practical implementation of the general scope theory and variables look-up in the environment.

A good candidate for that became a toy Scheme interpreter written in the new and excellent language CoffeeScript. Also, beside the environment features, this task is quite interesting to play with interpreters themselves and their theory. Continue reading →