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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21 | View Code Duplication | class CensusOfDeutschland1819 extends CensusOfDeutschland implements CensusInterface { |
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22 | /** |
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23 | * When did this census occur. |
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24 | * |
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25 | * @return string |
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26 | */ |
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27 | public function censusDate() { |
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30 | |||
31 | /** |
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32 | * Where did this census occur, in GEDCOM format. |
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33 | * |
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34 | * @return string |
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35 | */ |
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36 | public function censusPlace() { |
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39 | |||
40 | /** |
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41 | * The columns of the census. |
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42 | * |
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43 | * @return CensusColumnInterface[] |
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44 | */ |
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45 | public function columns() { |
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62 | } |
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Duplicated code is one of the most pungent code smells. If you need to duplicate the same code in three or more different places, we strongly encourage you to look into extracting the code into a single class or operation.
You can also find more detailed suggestions in the “Code” section of your repository.