From: Renaud HEBERT <renaud.hebert@...>
Date: 2001-09-06T16:04:09+09:00
Subject: [ruby-talk:20952] Re: calling original method in overrided method?

Yukihiro Matsumoto wrote:
> In message "[ruby-talk:20940] calling original method in overrided method?"
>     on 01/09/06, Henry House <hajhouse@houseag.com> writes:
> 
> |I don't like the default behavior of String#to_i and String#to_f to return
> |zero for any string that contains no recognizable numbers. I had thought to
> |write overriding methods like so:
> |
> |Class String
> |       def to_i
> |               fail "#{self} is not a valid integer" unless self =~ /^\d*$/
> |               # call original to_i
> |       end
> |end
> |
> |...but I don't how (if it is possible?) to call the original to_i. Am I stuck
> |with using a new method name or a custom string class?
> 
> use alias.
> 
>   class String
>     alias original_to_i
>     def to_i
>     end
>   end
> 
> You can use Integer() for strict checked conversion.
> 
>   Integer("abc")
>   # => `Integer': invalid value for Integer: "abc" (ArgumentError)
> 
>                                                         matz.


I'm curious: why is the default conversion act like that ?

I agree with Henry House that a "silent failure" like this is not a good
thing..

-- 
Renaud Hebert
phone: (33) 01 30 77 59 92
mailto:renaud.hebert@alcatel.fr