I wrote a recursive descent parser in Lisp for a YAML replacement language[1]. It wasn't difficult. Lisp makes it easy to write I/O, but also easy to separate l

I wrote a recursive descent parser in Lisp for a YAML replacement language[1]. It wasn't difficult. Lisp makes it easy to write I/O, but also easy to separate logic from I/O. This made it easy for me to write unit tests without mocking. I also wrote a toy resource scheduler at an HTTP endpoint in Haskell[2]. Writing I/O in Haskell was a learning curve but was ultimately fine. Keeping logic separate from I/O was the easy thing to do. 1: https://github.com/djha-skin/nrdl https://github.com/djha-skin/nrdl 2: https://github.com/djha-skin/lighthouse https://github.com/djha-skin/lighthouse