From: Brian Candler <lists@...>
Date: 2012-10-23T03:12:22+09:00
Subject: Re: Exception handelling in ruby

ajay paswan wrote in post #1080695:
> What is diffrence between:
>
> rescue => e
>
> and
>
> rescue Exception => e

The first is equivalent to

rescue StandardError => e

Exception is the top level class. You usually don't want to catch this; 
it includes things like Interrupt (ctrl-C), NoMemoryError, SyntaxError 
etc. which really ought to be fatal.

> For example: rescue ZeroDivisionError
> catches an error by division by zero, how to know -the type of error
> which is 'ZeroDivisionError' here.

>> 1/0
ZeroDivisionError: divided by 0
  from (irb):7:in `/'
  from (irb):7

>> ObjectSpace.each_object(Class).select { |e| e.ancestors.include? Exception }

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