From: Sebastian Hungerecker <sepp2k@...>
Date: 2007-11-23T01:03:32+09:00
Subject: Re: Ruby hashes

Alvaro Perez wrote:
> Example: An array of objects Teacher, each with his name and belonging
> school. After iterating though its elements, we want an output of the
> type, "school_name_A" => "teacher_name_A", "school_name_B" =>
> ["teacher_name_B", "teacher_name_C"].

hash = Hash.new {|h,k| h[k] = []}
teachers.each do |teacher|
  hash[teacher.school] << teacher.name
end


HTH,
Sebastian
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