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Ruby redo statment

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An example of redo statement in Ruby, redo makes an iteration step repeat itself again (http://www.rubyrailways.com/rubys-most-underused-keyword/).

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  1. # no recursion (1.8 has no tail call optimization)
  2. def fib(i)
  3.   acc = lambda do |i, n, result|
  4.            if i == -1
  5.             result
  6.            else
  7.              i, n, result = i - 1, n + result, n
  8.              redo
  9.            end
  10.         end.call(i, 1, 0)
  11. end

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