From: Robert Klemme <shortcutter@...>
Date: 2011-07-01T21:12:23+09:00
Subject: Re: How to order Structs based on two fields

On Fri, Jul 1, 2011 at 1:22 PM, Iņaki Baz Castillo <ibc@aliax.net> wrote:
> 2011/7/1 Robert Klemme <shortcutter@googlemail.com>:
>> array.sort_by {|e| [e.a, e.b]}
>
> Note that entries must be ordered by smaller :a and, in case of same
> :a, by higher :b. So the last "e.b" should be changed to something
> else. Trying it right now.

Oh, my mistake.  I am sorry.  So that would be (for numeric b):

array.sort_by {|e| [e.a, -e.b]}

And then

KK = Struct.new :a,:b do
 include Comparable

 def <=>(o)
   cmp = a <=> o.a
   cmp == 0 ? o.b <=> b : cmp
 end
end


Cheers

robert

-- 
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