cycle(...) public

Calls block for each element of enum repeatedly n times or forever if none or nil is given. If a non-positive number is given or the collection is empty, does nothing. Returns nil if the loop has finished without getting interrupted.

Enumerable#cycle saves elements in an internal array so changes to enum after the first pass have no effect.

   a = ["a", "b", "c"]
   a.cycle {|x| puts x }  # print, a, b, c, a, b, c,.. forever.
   a.cycle(2) {|x| puts x }  # print, a, b, c, a, b, c.
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