From: dblack@...
Date: 2006-08-25T09:54:06+09:00
Subject: Re: Alternative to String#to_i ?

Hi --

On Fri, 25 Aug 2006, Gennady Bystritsky wrote:

>
>
>> -----Original Message-----
>> From: dblack@rubypal.com [mailto:dblack@rubypal.com] On
>> Behalf Of dblack@wobblini.net
>> Sent: Thursday, August 24, 2006 4:52 PM
>> To: ruby-talk ML
>> Subject: Re: Alternative to String#to_i ?
>>
>> Hi --
>>
>> On Fri, 25 Aug 2006, Jeremy Lizt wrote:
>>
>>> Thanks to everyone for the quick response. The Integer
>> suggestion works
>>> great, but I'll point out one wrinkle that I encountered:
>>>
>>> Integer nil # => 0
>>>
>>> That was a small surprise. (These zeros keep popping up when you may
>>> not expect them!) My little conversion method now works
>> fine and looks
>>> like this:
>>>
>>>  def string_to_i(str)
>>>    if str.nil? then return nil else Integer str end
>>>  rescue nil
>>>  end
>>
>> I can't resist:
>>
>>    def string_to_i(str)
>>      Integer(str) rescue nil unless str.nil?
>>    end
>>
>> :-)
>
> Likewise ;-)
>
> def string_to_i(str)
>  str and Integer(str) rescue nil
> end

The only reason I like mine better than yours is that mine gives nil
for false, whereas yours gives false.  (Possibly not a big problem in
practice, though :-)


David

-- 
http://www.rubypowerandlight.com => Ruby/Rails training & consultancy
   ----> SEE SPECIAL DEAL FOR RUBY/RAILS USERS GROUPS! <-----
http://dablog.rubypal.com        => D[avid ]A[. ]B[lack's][ Web]log
http://www.manning.com/black     => book, Ruby for Rails
http://www.rubycentral.org       => Ruby Central, Inc.