TryRuby Level 4

tryruby04-block

# Ruby style
books.values.each { |rate| ratings[rate] += 1 } 

# Java style
for (Object rate : books.getValues()) {
  Integer count = ratings.get (rate);
  if (count != null) ratings.put (rate, new Integer(count.intValue() + 1))
  else ratings.put (rate, new Integer(1));
}