From: Rob Biedenharn <Rob@...>
Date: 2007-02-03T09:49:47+09:00
Subject: Re: halving a string

On Feb 2, 2007, at 12:52 PM, Trans wrote:
> On Feb 2, 10:55 am, Rob Biedenharn <R...@AgileConsultingLLC.com>
> wrote:
>> On Feb 1, 2007, at 11:10 PM, Chris Shea wrote:
>
>> Good solutions already, but I had to chime in with one less clever
>> and without regexps.
>> I also didn't like "halve" as a name so I used "cleave".
>>
>> Enjoy!
>>
>> class String
>>    def cleave
>>      middle = self.length/2
>>      early = self.rindex(' ', middle)
>>      late = self.index(' ', middle)
>
> [snip]
>
> This is nice and versitle. One good augmentation might be...
>
>     def cleave(middle=nil)
>       middle ||= self.length/2
>
> T.

That sounded good to me and so I did that and added support for  
negative (from the end) offsets, too.  And like String#[], it returns  
nil if the desired cleavage position is outside the string.

   def cleave(middle=nil)
     middle ||= self.length/2
     return nil unless (-self.length ... self.length).include?(middle)

     middle += self.length if middle < 0

     #...
   end

-Rob

P.S. If anyone wants the full thing (with the new tests), email me  
directly.

Rob Biedenharn		http://agileconsultingllc.com
Rob@AgileConsultingLLC.com