Design patterns and the principles behind clean code
The Gang-of-Four design patterns (factory, observer, strategy, decorator, adapter, proxy and more) by intent — and, crucially, how to tell the lookalikes apart (strategy vs state, decorator vs proxy, adapter vs facade, factory vs abstract factory). Plus SOLID, composition over inheritance, dependency injection, and the design judgment senior interviews and code reviews reward. Part of the Developer track.
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• Adapts every question to how you’re doing.
• Tracks your level over time. Skill practice, not a test.
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