Jsx Interview Questions

Render elements conditionally in React using if/else, ternary operators, logical AND, and null returns. Know the gotchas for each approach.

Conditional rendering in React is JavaScript control flow applied to JSX. Learn the four patterns, when to use each, and the gotchas that catch candidates off guard.

Use map() to transform arrays into JSX elements. Know when to use filter() and flatMap(), and how to handle nested arrays and empty states.

Understand the anatomy of a React function component, how JSX compiles, and the rules that make a valid component.

Understand what JSX compiles to, why it exists, and the rules that govern how you write it correctly.