From: William James <w_a_x_man@...>
Date: 2006-07-28T04:40:11+09:00
Subject: Re: Learn to Program - Solutions?

Nate Turnage wrote:
> On 7/27/06, James Edward Gray II <james@grayproductions.net> wrote:
> Refresh my memory on what that exercise is and I'm happy to give a
> > hint or two.
>
> "Rewrite your table of contents program on page 35. Start the
> program with an array holding all of the information for your table
> of contents (chapter names, page numbers, etc.). Then print out
> the information from the array in a beautifully formatted table of
> contents."
>
> The chapter is about array methods. For each chapter there is a
> chapter number, a chapter title, and a page number. I understand how
> the info for each chapter
> can live in an array, but I don't understand how all of the data for
> all of the chapters lives in a single array that holds all that data.
> Thanks in advance.
>
> pixelNate

toc = ['Table of Contents', 'Chapter 1', 'Getting Started',
        'page 1', 'Chapter 2', 'Numbers', 'page 9',
        'Chapter 3', 'Letter', 'page 13']

wd = 60

puts toc.shift.center(wd)

toc.inject([]){ |a,e|
  a << e
  if 3 == a.size
    a[0,2] = a[0,2].join( ": " ) + " "
    a.push  " " + a.pop[ /\d+/ ]
    print a.first, "." * (wd - a.first.size - a.last.size),
      a.last, "\n"
    a.clear
  end
  a
}