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Click on "Auto Step" to see the code execute step-by-step as the interpreter walks the AST :)

I hope metajs will be useful for building a mental model of how code really gets executed, especially with complicated control flow (like the Y-combinator example).

Source is on [GitHub][1]; it's written in node + IcedCoffeeScript, and uses browserify.

[1]: https://github.com/int3/metajs