From: "Brian Schröder" <ruby@...>
Date: 2004-10-06T04:48:00+09:00
Subject: Re: A ruby course

Leo wrote:
> Brian Schr�der wrote:
> 
> 
>>Hello Group,
>>
>>I need more help.
>>
>>Anybody has an idea for an exercise on extending existing classes.
> 
> 
> The code below introduce a new string concatenation operator '/' which 
> concatenates two strings placing '/' beween them. This is useful
> when forming path from directory and filename components.
> 
> class String
>   def /(rhs)
>     self.sub(%r{/+$}, '') + '/' + rhs.sub(%r{^/+}, '')
>   end 
> end if 
> 
> Now you can write the following code:
> 
> $dir='/usr/local/bin'
> $name='ruby'
> $full_path= $dir/$name
> 
> Also the '/' operator will make sure that the strings are joined by one and
> only one slash. Example:
> $dir='/badby/formed/dir///'
> 
> $name='///foo'
> 
> $dir/$name  => '/badby/formed/dir/foo'
> 
> Note, that poatterns like '///' were removed.
> 
> Hope it helps,
> Leo
> 

That is short and cool. I think this could be an example for me!

Thanks,

Brian

-- 
Brian Schr�der
http://ruby.brian-schroeder.de/