iterable

https://github.com/scooter-dangle/iterable

Provides the class IterableArray, which implements all of the methods of Array (as of Ruby 1.9.3) in an iterable-aware fashion. I.e., behavior is defined to the greatest extent possible for operations that modify an IterableArray from within an iteration block (e.g. each, map, delete_if, reverse_each). To use, call #to_iter on a pre-existing Array or use IterableArray.new; the IterableArray should act identically to a regular Array except that it responds logically to modifications during iteration.