The Ruby Language
This chapter is a bottom-up look at the Ruby language. Unlike the
previous tutorial, here we're concentrating on presenting facts,
rather than motivating some of the language design features. We also
ignore the built-in classes and modules where possible. These are
covered in depth starting on page 275.
If the content of this chapter looks familiar, it's because it should;
we've covered just about all of this in the earlier tutorial chapters.
Consider this chapter to be a self-contained reference to the core Ruby