From: Brian Candler <b.candler@...>
Date: 2008-11-26T21:04:27+09:00
Subject: Re: Begin else pattern question

Here's another option for removing the duplication of b_action:

def initialize(value)
  begin
    if value == 'blah'
      a_action
      return
    end
  rescue
  end
  b_action
end

This is not identical to your original code, which would call b_action 
twice if an exception occurred during the first invocation of b_action.

If a_action is short you could fold the first four lines to

    return a_action if value == 'blah'

Note that a bare 'rescue' is the same as 'rescue StandardError'. Certain 
exceptions, typically due to lack of system resources, are not caught. 
Often that is what you want, but to catch absolutely everything do

    rescue Exception

Finally, there is the expression version of rescue, which I believe 
catches StandardError:

def initialize(value)
  (return a_action if value == 'blah') rescue nil
  b_action
end

Regards,

Brian.
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