## Chapter 8 ##

### Building and sorting an array
    words_array = []
    puts 'Write one word per line, enter an empty line to finish'
    while true
      word = gets.chomp
      if word == ""
        break
      end
      if word.include? ' '
        puts "Just one word per line please."
        next
      end
      words_array.push(word)
    end
    puts 'Sorted words: '
    puts words_array.sort()

### Table of contents, revisited
    LINE_WIDTH = 55
    HALF_LINE_WIDTH = LINE_WIDTH/2

    table_elements = [["Getting Started"," 1"],["Numbers"," 9"],["Letters","13"]]

    puts 'Table of Contents'.center(LINE_WIDTH)
    puts ''

    i = 0
    table_elements.each do |element|
      chapter = "Chapter " + i.to_s + ":  " + element[0]
      page = "page " + element[1]
      puts chapter.ljust(HALF_LINE_WIDTH) + page.rjust(HALF_LINE_WIDTH)
      i += 1
    end