How to get words frequency in efficient way with ruby?

Question

Sample input:

\"I was 09809 home -- Yes! yes!  You was\"

and output:

{ \'yes\' => 2, \'was\' => 2, \'i\' => 1, \'home\         


        

Answer 1

class String
  def frequency
    self.scan(/[a-zA-Z]+/).each.with_object(Hash.new(0)) do |word, hash|
      hash[word.downcase] += 1
    end
  end
end

puts "I was 09809 home -- Yes! yes! You was".frequency