Teaching Ruby to Count
summary
Shows concrete code: build a Month domain object and implement <=> and succ so Date ranges iterate by month, wrap chapter files in a CompositeFile that defines each and include Enumerable to get map/select/find, and return an Enumerator when no block so callers can choose traversal. Demonstrates Enumerator#next and #each, generating infinite series (random or cycle) and using take on infinite series to consume just what’s needed.
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