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What programming languages have the most easily-implemented interpreters?

I need to implement an interpreter for a programming language as part of a project I'm working on. I don't think the details of this project are too relevant, except that it requires me to implement an interpreter from scratch, I can't use an existing programming language (the requirements include supporting portable delimited continuat...

How do I design and implement a programming language?

This question is related to This question on Aardvark This question on here The past couple of years I've been thinking about things I like and don't like about languages I use. I always wanted to write my own language, but never did so. I also own both the Lego RCX and NXT, but most of the time I never actually make my robots do an...