Flowdock
each_with_index() public

Calls block with two arguments, the item and its index, for each item in enum.

   hash = Hash.new
   %w(cat dog wombat).each_with_index {|item, index|
     hash[item] = index
   }
   hash   #=> {"cat"=>0, "wombat"=>2, "dog"=>1}
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