TARGET_PHRASE = "METHINKS IT IS LIKE A WEASEL"
TARGET = TARGET_PHRASE.chars
TARGET_LENGTH = TARGET.length
CHAR_SET = TARGET.uniq

def make_baby
  Array.new(TARGET_LENGTH).map {CHAR_SET.sample}
end

def mutate weasel, trait
  weasel[trait] = CHAR_SET.sample
end

baby_weasel = make_baby

mutations = 0
TARGET_LENGTH.times do |i|
  while baby_weasel[i] != TARGET[i]
    mutate(baby_weasel, i)
    mutations += 1
    puts baby_weasel.join
  end
end
puts "And it only required #{mutations} mutations!"