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

def count_words(string)
  string.scan(/\w+/).reduce(Hash.new(0)){|res,w| res[w.downcase]+=1;res}
end

Second variant:

def count_words(string)
  string.scan(/\w+/).each_with_object(Hash.new(0)){|w,h| h[w.downcase]+=1}
end