Duplicate code is one of the most pungent code smells. A rule that is often used is to re-structure code once it is duplicated in three or more places.
Common duplication problems, and corresponding solutions are:
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23 | View Code Duplication | class Division extends Operator { |
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25 | protected $precidence = 5; |
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27 | public function operate(\SimpleMath\Stack $stack, $variables=array()) { |
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33 | } |
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