Cover page by Russ Olsen

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Chapter 20. Use Hooks to Keep Your Program Informed

Metaprogramming is one of those words that seems to exist purely to scare people. Are we talking about programming beyond programming? Programming turned up to 11? Programming in the next dimension? In fact, metaprogramming—at least as it is practiced in the Ruby world—is a very workman set of coding techniques that allow you to get the results you need with less code. Ruby support for metaprogramming starts by allowing your code to stay amazingly well informed about what’s going on around it. With a tiny bit of effort, you can write Ruby programs that know when a new class is created, when a method gets called, and even when the application is about to exit. Of course, all this knowledge would ...

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