gistfile1.rb

def to_h(w)
  r = {}
  w.each_char do |ch|
    r[ch] ||= 0
    r[ch] += 1
  end
  r
end

@dict_word_letters = {}

f = File.open('wl.txt')

f.each_line do |word|
  word = word.strip
  @dict_word_letters[word] = to_h(word)
end

def anagrams(w)
  res = []
  wh = to_h(w)
  @dict_word_letters.each do |w, h|
    res << w if wh == h
  end
  res
end

puts anagrams('horse')