Today I learnt that Scheme (1975) is actually older than Common Lisp (1984)! I'd assumed that Scheme designs were a response to CL.
Many of the CL features were created earlier, in fairness. CL was standardising the feature set.
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Today I learnt that you can mix HTML inline in markdown! For example, the following is valid.
Foo <hr/>
I'd assumed that you needed HTML separately, like ``` blocks, but no: https://spec.commonmark.org/0.31.2/#raw-html
Admittedly HTML is very restricted on most sites, but it's helpful for SSGs.
Today I learnt that Emacs 28 shipped a context-menu-mode! https://oylenshpeegul.gitlab.io/blog/posts/20230129/
This seems quintessentially Emacs: deeply hackable, but building UI features in an order very different to the mainstream.
Today I learnt that Racket *intentionally* doesn't have a traditional REPL workflow. The authors were concerned about students not understanding the state between the current session and the code on disk.
(Arguably Jupyter has some of these features now.)
https://blog.racket-lang.org/2009/03/the-drscheme-repl-isnt-the-one-in-emacs.html