Monads in Joy, a concatenative language: https://web.archive.org/web/20100816085746/http://www.latrobe.edu.au/philosophy/phimvt/joy/j04alg.html
Related Posts
Blogging about my programming language project: choosing the basic syntax!
https://www.garden-lang.org/blog/syntax.html
The niche of short, environment-specific scripts, and the consequences for programming language design choices: https://brrt-to-the-future.blogspot.com/2021/03/why-bother-with-scripting.html
I've added syntax highlighting to the prompt of my programming language!
It's not strictly necessary, but it's nice to have. It caught a bug with lexing incomplete string literals too.