8.4. Conclusion
We’ve taken a good look here at arrays, hashes, and enumerables in general. We’ve seen some similarities between arrays and hashes—most of which are due to the fact that both mix in Enumerable—as well as some differences. We’ve looked at converting between arrays and hashes, and we’ve seen some interesting ways of extending their standard behavior.
We’ve examined common methods of iteration such as each_slice and each_cons. We’ve also seen how enumerator and generator objects work.
In Chapter 9, we again look at high-level data structures. But these will be slightly higher level and may not necessarily be provided as part of the Ruby core or standard libraries. These include sets, stacks, queues, trees, and graphs.
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