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Discussion on: My 5 Favorite Software Design Principles 

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Scott Simontis

Context is crucial too...you can have the same code show up in different places with completely different contexts which looks repetitive, but it makes no sense to de-duplicate something that crosses system boundaries.

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Jeremy Morgan Author

Absolutely right. Sometimes you can have the exact code verbatim and working off two different input/outputs. One of those implementations may change without the other so by de-duping and putting into a method you can be creating a regression.

This is why software engineering is so fun! (not saying it sarcastically)

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Jesco Wuester

duplication is better than the wrong abstraction :D

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Jeremy Morgan Author

most of the time, yes