Code Smell 29 — Settings/Configs

Changing system behavior in a control board is the customer’s dream. And the software engineer’s nightmare.

Problems

  • Duplicated Code

Solutions

  1. Avoid Settings

Sample Code

Wrong

Right

Detection

This is an architectural pattern so it should be controlled/avoided by design policies.

Examples

Exceptions

  • Sometimes we use Feature togging as a safeguard mechanism. This is acceptable in a legacy system. These toggles should be very short-lived in a CI/CD system.

Tags

  • Globals

Conclusion

Setting runtime behavior is great for software systems.

We should configure our objects, so they can behave in different ways, and we should achieve it in an explicit way with explicit behavioral objects.

In this way, our code will be more declarative, clean and testable. It is not as easy as adding an IF Statement. This kind of lazy developers bring lots of coupling and unexpected issues on our systems.

A system with 300 Boolean configurations has more test combinations (2^300), than the number of atoms in the universe (10^80).

Also known as

  • Feature Toggles

More Info

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Dev Genius

Coding, Tutorials, News, UX, UI and much more related to development

Maximiliano Contieri

Written by

I’m senior software engineer specialized in declarative designs. S.O.L.I.D. and agile methodologies fan.

Dev Genius

Coding, Tutorials, News, UX, UI and much more related to development

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