| Design patterns |
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| • | Idea: extract
these common patterns and |
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| create a
catalog of design patterns |
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| – | allows other
designers to reuse successful |
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| designs and
avoid unsuccessful ones |
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| – | creates a
common vocabulary for discussing |
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| designs |
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| – | 1995: Design
Patterns book by the Gang of |
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| Four (Gamma,
Helm, Johnson, Vlissides) |
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| » | describes 21
common patterns |
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