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You might not be excited about “implementing a slow version of Java in Java”, but that doesn’t make it a bad approach. (Also, second part is about implementing same interpreter in C)

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Well implementing all the OOP semantics and such could complicate and dilute the essentials. A simpler language would also make it easier to cover more ground, such as type checking. So I don't think it sounds ideal from a pedagogical perspective either, but again, I haven't read the book.

Note that Lisp in Lisp (SICP) works well because Lisp itself is very simple and just the essentials. It's just one chapter in SICP.

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