From: "trans.  (T. Onoma)" <transami@...>
Date: 2004-12-28T06:25:15+09:00
Subject: Re: split on '' (and another for split -1)

On Monday 27 December 2004 03:33 pm, Carlos wrote:
| ["trans.  (T. Onoma)" <transami@runbox.com>, 2004-12-27 20.31 CET]
|
| > Here's a generic routine I'm working on:
| >
| >   class String
| >     def last=(str, separator=$/)
| >       separator = '' unless separator
| >       raise "separator must be a String" unless String === separator
| >       s = self.split(separator, -1)
| >       s[-1] = str
| >       self.replace(s.join(separator))
| >     end
| >   end
| >
| >   $/ = "\n"
| >   s = "ab\nc"
| >   s.last = "123"
| >   p s
| >   # => "ab\n123"
| >
| > Now try:
| >
| >   $/ = ""
| >   s = "abc"
| >   s.last = "123"
| >   p s
| >
| > Unfortunately this does not give a congruent result.
|
| $/="" means paragraph mode, and it is acknowledged(?) by IO#gets,
| #readlines, String#each, #to_a, etc. Maybe you should do the same?
|
| And that solves your problems with split('') ;)))).

Boy, that's a real side-splitter! Watch me slap my knee! ;)))).

But seriously, you can call it anything you wish. It does not change the 
behavior.

"Moreover you have a peculiar definition of paragraph. ".split('')
=> ["M", "o", "r", "e", "o", "v", "e", "r", " ", "y", "o", "u", " ", "h", "a", 
"v", "e", " ", "a", " ", "p", "e", "c", "u", "l", "i", "a", "r", " ", "d", 
"e", "f", "i", "n", "i", "t", "i", "o", "n", " ", "o", "f", " ", "p", "a", 
"r", "a", "g", "r", "a", "p", "h", ".", " "]

A more informative explanation of this "paragraph mode" might actually be 
helpful.

T.