Homework

homework.rb

#!/usr/bin/ruby

# our dictionary file
WORDS = 'english.txt'

# build the letter-to-point map
letters = Hash.new
count = 0
('a'..'z').to_a.each do |x|
  count += 1
  letters[x] = count
end

# open the file, read each line
File.open(WORDS,'r').read.each_line do |line|

  # get rid of the newline
  line.chomp!

  # make everything lowercase
  line.downcase!

  # make sure the word is ASCII a-z (no words with graphemes, numbers, etc.)
  if /^[a-z]+$/.match(line).nil?
    next
  end

  # split the line into each letter, lookup the amount, add it to the total
  total = 0
  line.split('').each do |letter|
    total += letters[letter]
  end

  # if the total is a dollar word, print it out
  if total == 100
    puts "#{line}"
  end

end