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Roger Braun wrote:
> How about this:

You should really know about Enumerable#group_by.

irb(main):001:0> [0,15,35,100,205,300].group_by {|i| i/100 }
=3D> {0=3D>[0, 15, 35], 1=3D>[100], 2=3D>[205], 3=3D>[300]}



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