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Sandi Metz

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20 January 2016

Sandi MetzKorrents 20 Jan 2016

From one piece The Wrong Abstraction 4 beliefs, in the piece's order there

korrents.com
Parameters and conditional branches accumulating inside shared code are the diagnostic that the abstraction is wrong.

Their words

If you find yourself passing parameters and adding conditional paths through shared code, the abstraction is incorrect.

The Wrong Abstractionsandimetz.com
korrents.com
When an abstraction turns out to be wrong, the fastest way forward is to inline it back into every caller and let the duplication show what the right one is.

Their words

Once an abstraction is proved wrong the best strategy is to re-introduce duplication and let it show you what's right.

The Wrong Abstractionsandimetz.com
korrents.com
Existing code exerts a powerful influence: its presence argues that it is correct and necessary, and sunk cost keeps teams inside an abstraction that has stopped fitting.

Their words

Existing code exerts a powerful influence. Its very presence argues that it is both correct and necessary.

The Wrong Abstractionsandimetz.com

+ 1 more

korrents.com
Duplication is cheaper than the wrong abstraction, so code should not be made reusable before there are real examples of what the reuse has to do.

Their words

duplication is far cheaper than the wrong abstraction

The Wrong Abstractionsandimetz.com

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