From: Tj Holowaychuk <tj@...>
Date: 2009-01-17T03:01:31+09:00
Subject: Bloc param parens |memo, (a, b)|

In Ruby < 1.9 what does this really do? For example I wrote

class String
  def tokenize! hash
    hash.inject(self) { |s, (k, v)| s.gsub! /:#{k}/, v }
  end
end

Which has a usage of:
'Welcome :name, enjoy your :object'.tokenize!({ :name => 'TJ', :object
=> 'cookie' })

anyways, the inject did not work as desired until I put parens around
the last two parameters, yet I do not entirely understand whats going
here! does this just cause the distribution of the variables to change?
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