Common Words Challenge

common_words.rb

def most_common(string)
  counts = {}
  words = string.downcase.tr(",.?!",'').split(' ')

  words.uniq.each do |word|
    counts[word] = 0
  end

  words.each do |word|
    counts[word] = string.scan(word).count
  end

  max_quantity = counts.values.max
  max_words = counts.select { |k, v| v == max_quantity }.keys
  max_words
end

#most_common('a short list of words with some words\n') #['words']
#most_common('Words in a short, short words, lists of words!\n') #['words']
#most_common('a short list of words with some short words in it\n') #['words', 'short']