this post was submitted on 02 Sep 2024
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S-expressions are basically directly writing the AST a compiler would normally generate. They can be extremely flexible. M-expressions were supposed to be programming part of Lisp, and S-expressions the data part. Lisp programmers noticed that code is just another kind of data to be manipulated and then only used S-expressions.
Logo is arguably a Lisp with M-expressions. But whatever niche Logo had is taken by Python now.