There is inestimable value in doing so. I find the approach especially valuable for learning new programming technologies — in practice, learning a new technol

There is inestimable value in doing so. I find the approach especially valuable for learning new programming technologies — in practice, learning a new technology comes down to the questions: what does the code look like, and why? By looking deeply at the hardest parts of the source code, I find out how much I don't know about the software and learn more about the system itself.