From: HarryO <harryo@...>
Date: 2001-12-22T15:55:12+09:00
Subject: [ruby-talk:29297] Re: upper case to lower

On Sat, 22 Dec 2001 11:09:08 +1100, Bashar A. Asad wrote:


>> Dir.entries(X).each do |f|
>>   (n = f.dup).downcase! and File.rename(File.join(X, f), File.join(X,
>>   n))
>> end
>>
> okey I don't understand the "!" part why do u have it

In Ruby, methods that modify an object, as opposed to returning
a new version of an object with the requested change, tend to
end with '!'.

So, if you do ...

   puts fred.downcase

you will see a lower case version of fred, but fred won't be
changed.  If yo do ...

   puts fred.downcase!

fred will be changed to lower case.