From: ts <decoux@...>
Date: 2002-12-03T23:10:29+09:00
Subject: Re: exception types

>>>>> "S" == Shannon Fang <xrfang@hotmail.com> writes:

S> Can anybody help me on the rescue clause? I tried to catch file not found 
S> error of file.open method, but I don't know what type of error to use in 
S> rescue clause. i tried to write nothing after rescue, it seems not catching 
S> the error. Further more:

 Well, what error ruby give you ?

pigeon% ls aa
ls: aa: No such file or directory
pigeon%
 
pigeon% ruby -e 'File.open("aa") rescue true'
pigeon% 

S> 1. where can I find a reference to different kind of runtime errors? It 
S> seems that there are no information on that (Exception Class?) in pickaxe...

 p. 303

S> 2. in "rescue SyntaxError, NameError => boom", is => used to denote a hash? 
S> if so, why NameError is a hash?

 well,

   begin
      # do something
   rescue SyntaxError, NameError => boom
      # do something
   end

 is the same than

   begin
      # do something
   rescue SyntaxError, NameError
      boom = $!
      # do something
   end



Guy Decoux






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