React Fundamentals for Frontend Interviews

Frontend screening rounds often probe React fundamentals to verify that candidates understand how the declarative paradigm functions under the hood. Understanding why React components must remain pure functions without side-effects during render is the first line of defense against subtle production bugs.

In these lessons, step through JSX compilation via the modern jsx-runtime, analyze the React element object structure, inspect list reconciliation key rules, and avoid common traps like the boolean zero pitfall in conditional rendering.