Ruby: How to group a Ruby array?

Question

I have a Ruby array

> list = Request.find_all_by_artist(\"Metallica\").map(&:song)
=> [\"Nothing else Matters\", \"Enter sandman\", \"Enter Sandman         


        

Answer 1

list.inject(Hash.new(0)){|h,k| k.downcase!; h[k.capitalize] += 1;h}