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magic comment map method, 2nd, 3rd  block evaluation with  building on top of each  in-place mapping with map!  return values of mapping, in place with map! match method, 2nd  common uses  difference between match and match?  substring captures  with lookaheads  with MatchData, 2nd  with modifiers match? method, 2nd MatchData class, 2nd matches  conditional  constraining with quantifiers  success and failure matching, with regular expressions Math module max methods merge method, 2nd message method message receivers  classes as    class methods vs. instance methods    class objects calling methods    creating class objects    singleton method    writing class methods  self as default ...
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