From: "Jan E." <lists@...>
Date: 2012-04-13T19:13:17+09:00
Subject: Re: How to make the "rescue" expression in a method

Hi,

You can define the method to accept a block and rescue exceptions coming 
from the block:

def execute_and_rescue
  begin
    yield  # execute the block
  rescue StandardError => error
    puts error.message
  end
end

execute_and_rescue do
  1/0
end


Some things to note:

- You current method definition doesn't really make sense, because you 
neither do actual error handling nor do you suppress the error. What's 
the purpose of the method? If you only want to change how error messages 
are displayed, you should wrap the whole script in a begin-end block.

- It doesn't make sense to define the method as a singleton method of 
class. If you want to use it everywhere, define it in the Kernel module. 
Otherwise, define it in the specific class.

- Don't rescue instances of Exception, because this class also includes 
system errors that you shouldn't touch. Rescue StandardError instead (or 
even better: specific error classes).

- You can save the exact error object in the rescue block (see above). 
Then you don't have to rely on the $! global variable.

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