From: Yossef Mendelssohn <ymendel@...>
Date: 2007-06-05T00:56:02+09:00
Subject: Range comparisons

Something came up as I was testing some ideas.  I know Range objects
can indicate whether a specific object is an included element, but
something I thought might work didn't:

irb(main):001:0> (1..10).include?(2..6)
=> false

I know a simple case like this can be covered with (1..10).include? 2
and (1..10).include? 6   (range1 includes both range2.first and
range2.last), but doing it that way seems not entirely right,
especially when it comes to other cases.  A big problem, as I see it,
would be trying to figure out what to do if the second range excludes
its end.


Maybe I'm just thinking about this completely wrong.  Maybe I should
be using Sets or something.  Knowing about intersects would be nice,
too.

Any thoughts?

--
-yossef