How do I use the Enumerable mixin in my class?

Question

I have a class called Note, which includes an instance variable called time_spent. I want to be able to do something like this:

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Answer 1

The Enumerable documentations says the following:

The Enumerable mixin provides collection classes with several traversal and searching methods, and with the ability to sort. The class must provide a method each, which yields successive members of the collection. If Enumerable#max, #min, or #sort is used, the objects in the collection must also implement a meaningful <=> operator, as these methods rely on an ordering between members of the collection.

This means implementing each on the collection. If you're interested in using #max, #min or #sort you should implement <=> on its members.

See: Enumerable