Wrap-Up

Here are a few spells and other interesting things that you learned today:

• What Scope Gates () are and how Ruby manages scope in general

• How to make bindings visible through scopes with Flat Scopes () and Shared Scopes ()

• How to execute code in an object’s scope (usually with instance_eval or instance_exec), or even in a Clean Room ()

• How to turn a block into an object (a Proc) and back

• How to turn a method into an object (a Method or an UnboundMethod) and back

• What the differences are between the different types of callable objects: blocks, Procs, lambdas, and plain old methods

• How to write your own little DSL

That was a lot of new stuff in a single day. As you sneak out of the office, however, you can’t shake the nagging feeling that you’ll learn some of Ruby’s best-kept secrets tomorrow.

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