From: Jeff 'japhy' Pinyan <jeffp@...>
Date: 2002-02-04T12:17:22+09:00
Subject: Re: range and modification

On Feb 4, Sung Moon said:

>n[4..8].sort!  doesn't work(same for compact!, collect!)

That's because

  a = b[4..8]

doesn't make a[0] through a[5] "aliases" to b[4] through b[8].

  b = (0..19).to_a
  a = b[4 .. 8]
  a[0] = 99
  puts b.join(" ")

You'll see that b[4] is still 4, not 99.

>Is there any elegant way to do this job?

  n[4..8] = n[4..8].sort

is my best suggestion.

>2. It seems LAST line in text does not have \n or \r\n,
>    (I used Wordpad for creating this text)
>   so I can't use chop/chomp without losing last digit/character.

Uh, you can use chomp() safely.

  ["jeff\n", "japhy"].each{|str| puts "<#{ str.chomp }>"}
  # <jeff> and <japhy>

-- 
Jeff "japhy" Pinyan      japhy@pobox.com      http://www.pobox.com/~japhy/
RPI Acacia brother #734   http://www.perlmonks.org/   http://www.cpan.org/
** Look for "Regular Expressions in Perl" published by Manning, in 2002 **
<stu> what does y/// stand for?  <tenderpuss> why, yansliterate of course.