ただ単に逆順にしたいならArray#reverseを使えばいいが、それにwith_indexを使うと昇順になってしまう。なので、each_with_indexに、reverse_eachを使う。
%w(one two three).each_with_index.reverse_each do |v, i|
puts "#{v} : #{i}"
end
three : 2
two : 1
one : 0
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