From: Brian Candler <b.candler@...>
Date: 2010-11-30T21:26:50+09:00
Subject: Re: Help sorting an array

Jim Burgess wrote in post #964771:
> Is there any way to reverse this so that the months precede the
> events?
> Like this:
> ["MARCH", #<Event:0x4d4cf78>, #<Event:0x4d4d470>,
> "FEBRUARY",#<Event:0x4d4dc08>, #<Event:0x4d4e100>, "JANUARY",
> #<Event:0x4d4e898>]
>
> I have been scouring the documentation for ages and have also googled
> everything I can think of (e.g. Array#split) to try and find a solution,
> but with no luck.

If your Event has an accessor which shows the month of that object as a 
String, then you could do something like this:

arr = arr.sort_by { |e| e.is_a?(Event) ? [1,e.month] : [0,e] }

However, a heterogenous (mixed) list is not a convenient data structure 
to work with, as you've probably found. There may be a better way to 
group this data, depending on what you plan to do with it. For example, 
you could build a hash of
  month => [array of events for that month].
or a nested array of
  [[month, [events]], [month, [events]], ... ]

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