top_words_addiction.rb

dictionary = Hash.new { |hash, key| hash[key] = 0 }
Dir["*.md"].each do |filename|
  File.readlines(filename).each do |line|
    line.split(" ").each do |word|
      dictionary[word] += 1 if word.length > 3
    end
  end
end
dictionary.reject! { |_,counter| counter < 10 }
p dictionary.sort_by{|k,v|v}