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Book club: Pattern Hatching

Our first Itenium Book Club pick: design patterns, misconceptions, and real-world trade-offs.

About this event

25/12/2025
18h - 23h30
Virtual

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About the book club

We kicked off the Itenium Book Club with our very first book: Pattern Hatching by John Vlissides (one of the GoF authors). The concept is simple: we read the same chapters, then get together to compare notes, challenge assumptions, and link the ideas back to real project work.

This wasn’t a passive “book summary” session. It was a practical discussion where we tested the ideas on actual code, questioned when patterns help (and when they don’t), and shared how these concepts show up in day-to-day engineering decisions.

Our key takeaway: patterns aren’t theory for interviews — they’re tools that help solve messy design problems more cleanly, when used with good judgment. Big thanks to everyone who joined: the questions and perspectives made the sessions much richer.

[Inhoud event]

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Session highlights

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Design patterns, demystified

We started with common misconceptions: what patterns are (and aren’t), and why they still matter when used intentionally.

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OO FileSystem deep-dive

We explored an object-oriented file system and discussed how patterns like Composite, Proxy and Visitor shape the design — with Visitor stealing the show as the most intriguing (and potentially dangerous) pattern of the night.

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Are patterns missing language features?

We compared a C# implementation with Julia’s multiple dispatch and debated a classic question: are design patterns simply workarounds for limitations in a language?

What we explored

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Template Method

To standardize access control logic and keep the flow consistent across scenarios.

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Singleton

A central security manager to coordinate rules and decisions.

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Mediator

To simplify user-permission interactions and avoid tangled dependencies.

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