principles:don_t_repeat_yourself
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principles:don_t_repeat_yourself [2021-05-19 10:22] – old revision restored (2021-05-11 19:01) 2a04:ac00:4:d29:5054:ff:fe00:d387 | principles:don_t_repeat_yourself [2021-09-02 11:47] – old revision restored (2021-05-19 10:22) 65.21.179.175 | ||
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* [[contexts: | * [[contexts: | ||
- | ===== Principle Statement | + | ===== Definition |
> "Every piece of knowledge must have a single, unambiguous, | > "Every piece of knowledge must have a single, unambiguous, | ||
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If there are several representations of the same information (be it code or any other form of information), | If there are several representations of the same information (be it code or any other form of information), | ||
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- | ===== Strategies ===== | ||
- | |||
- | * Add a new invokable module (a function, a method, a class, etc.) instead of duplicating code | ||
- | * Use code generation when information has to be represented in multiple forms | ||
- | * Use polymorphism to avoid repeatedly enumerating a set of possible solutions in if or switch statements | ||
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- | ===== Caveats ===== | ||
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- | See section [[#contrary principles]]. | ||
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===== Evidence ===== | ===== Evidence ===== | ||
/* Comment out what is not applicable and explain the rest: */ | /* Comment out what is not applicable and explain the rest: */ | ||
- | /* | + | / |
- | + | /*[[wiki: | |
- | | + | [[wiki: |
- | | + | / |
- | + | ||
- | /* | + | |
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==== Generalizations ==== | ==== Generalizations ==== | ||
- | * [[Murphy' | ||
==== Specializations ==== | ==== Specializations ==== | ||
- | * [[Once And Only Once]] | + | * [[principles: |
- | * [[Single Choice Principle]] (SCP): Duplication can also be duplication of information about a set of possibilities. The SCP is about this aspect. | + | * [[principles: |
- | * [[Write Code That Writes Code]]: This is the code generation aspect of DRY. | + | |
==== Contrary Principles ==== | ==== Contrary Principles ==== | ||
- | * [[Keep It Simple Stupid]] | + | * [[principles:Keep It Simple Stupid]]: Especially code generators can be very complex. |
==== Complementary Principles ==== | ==== Complementary Principles ==== | ||
- | * [[Generalization Principle]] (GP): A generalized solution avoids duplication. | ||
==== Principle Collections ==== | ==== Principle Collections ==== | ||
- | {{page> | ||
- | {{page> | ||
- | ===== Examples | + | ===== Example |
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* [[wp> | * [[wp> | ||
* [[http:// | * [[http:// | ||
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principles/don_t_repeat_yourself.txt · Last modified: 2021-10-18 21:27 by christian