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Sharon Rosner http://hiperu.blogspot.com

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foldr and foldl in Ruby

   1  
   2  module Enumerable
   3    def foldr(o, m = nil)
   4      reverse.inject(m) {|m, i| m ? i.send(o, m) : i}
   5    end
   6  
   7    def foldl(o, m = nil)
   8      inject(m) {|m, i| m ? m.send(o, i) : i}
   9    end
  10  end
  11  
  12  [1, 2, 3, 4, 5].foldl(:+) #=> 15
  13  [1, 2, 3, 4, 5].foldl(:*) #=> 120
  14  
  15  [1, 2, 3, 4, 5].foldr(:-, 0) #=> 3
  16  [1, 2, 3, 4, 5].foldl(:-, 0) #=> -15


to ruby array enumerable foldl foldr by ciconia on Jan 09, 2007
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