Implementing a Quick and Dirty Interpreter
So what is the quickest way to build a programming language interpreter? Embed another interpreter in your code!
As programmers we sometimes shy away from some great solutions to problems because we consider them inelegant. I think one of the reasons is because they don't demonstrate our prowess as a programmer. As I am finally starting to grow out of that phase of trying to prove my abilities in every program I write and realizing that working solutions are better than elegant ones, I find I am starting to consider solutions to problems I would never have previously.
A great example of this, is a recent programming language interpreter I had to build to demo for a potential customer. I had a very short amount of time, so what I did was embed a Lua interpreter in my own interpreter.
Perhaps you have some other neat hacks that worked surprisingly well, but are almost embarassed to share?