React Design Patterns

React design patterns are a staple SDE-2 topic — interviews expect you to explain when to use compound components vs prop drilling, controlled vs uncontrolled inputs, and why custom hooks replaced HOCs and render props.

This module covers all 10 core patterns plus advanced techniques: Suspense, memoization, portals, and state machines — with code examples and a when-to-use guide.

Patterns are tools, not rules — you will learn which pattern solves prop drilling, repeated logic, cross-cutting auth, modal rendering, and complex multi-step flows without over-engineering simple components.

All 10 core patterns plus Suspense, memoization, portals, and XState state machines — each with code examples, a when-to-use table, and 30 interview questions from compound components to error boundaries.