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I recommend PLT Scheme too (especially for its IDE). After you've played with it for some time (and if you're versed in C, of course) I would recommend to grab

by cesare 17y ago

I recommend PLT Scheme too (especially for its IDE). After you've played with it for some time (and if you're versed in C, of course) I would recommend to grab a lightweight implementation (TinyScheme is my favorite) and study its source. Happy hacking!