I learned to code on an LP MUD back in the late 90s. It was a fun experience.

I did all my work in the MUD interface using ED. I didn't realize other people wrote their code offline and sh'd in to upload it. I got very good at writing and editing code on the command line.

i remember using ED in LPmuds. fun times. i had learned coding already so i can't claim that much, but when it came to web development i discovered the spinner webserver, written in uLPC, a GPL licensed rewrite of LPC (later renamed to roxen and pike). i could not believe my luck to discover a webserver written in a language that i was already familiar with from MUD coding.

nowadays i am using a web-platform for my websites that is not only written in pike but also implements a MUD like architecture.