[zaphar]

I work in industry and I recently had to implement a special purpose templating language for our product. For various reasons none of the off the shelf ones quite did what we needed.

As a result I had to write a parser and interpreter. The thing about a lot of these computer science things is that you don't need them until you do. And then when you do it's nice to know about how they work.

[MarkL4]

Can anyone recommend an article for interpreters that is exactly at the level of the original link?

[minikomi]

Perhaps https://www.hashcollision.org/brainfudge/

[abecedarius]

I guess http://norvig.com/lispy.html would be about right.