What is the Open-Closed Principle OCP really?

It's about shielding clients from internal changes via stable interfaces, not banning all modifications.

How to implement OCP in Swift?

Use protocols for variation points. Inject dependencies. Let extensions handle growth.

Does OCP mean no code changes ever?

Nope. Just contain the blast radius.

OCP's Big Lie: Stop Guessing the Future

Open-Closed Principle? It's not about psychic coding. Jon Skeet calls BS on the hype—time to rethink how you build extensible Swift without the guilt.

DevTools Feed Apr 03, 2026 4 min read 12 views

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Diagram showing bad vs good OCP implementation in Swift code with protocols

⚡ Key Takeaways

OCP isn't "no modifications ever"—it's about stable boundaries for changes. 𝕏
Use protocols in Swift to isolate variations like payments or shapes. 𝕏
Protected Variations beats OCP wording; predict real, current flux. 𝕏

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