Reverse a hash in Ruby

Question

How would I reverse the elements in the hash, keeping the same values and keys, but reversing their order in the hash.

Like so:

{ \"4\" => \"happiness         


        

Answer 1

if need:

hash = {:a => :x, :b => :y, :c => :y, :d => :z}

to:

{:x => [:a], :y => [:b, c], :z => [:d] }

can:

h={};hash.to_a.each{|e|h[e[1]]||=[];h[e[1]]<