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)
  Hash[
    string.scan(/[a-zA-Z]+/)
      .group_by{|word| word.downcase}
      .map{|word, words|[word, words.size]}
  ]
 end

puts count_words 'I was 09809 home -- Yes! yes!  You was'