That's the case of for me as well. I always leave a comment trying to explain to my future self where I learned to do stuff that was not intuitive. Bash, Make

That's the case of for me as well. I always leave a comment trying to explain to my future self where I learned to do stuff that was not intuitive. Bash, Make, non-standard Python libraries, E-Lisp, and Fortran. Also, it's been quite a while since I've touched JavaScript, so the newer features have been harder to grok.