From: Joel Pearson <lists@...>
Date: 2013-03-29T19:12:22+09:00
Subject: Re: Hash with default

Well, if you really wanted to do it all in one go then this might work:

h = Hash.new {|x,y|
  if some_condition
    x[y] = 'moose'
  else
    x[y] = y
  end
}

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