Frontend interview articles

Custom Hooks: Extracting Reusable Logic

How to build and name custom hooks, and what makes them testable and reusable.

React Context: When to Use It (and When Not To)

Context basics, performance implications, and alternatives like composition.

Controlled vs Uncontrolled Components (Forms)

How to think about form inputs, refs, and when each approach makes sense.

#Forms#Interview

State Updates and Batching in React

How React batches state updates and what it means for setState and derived state.

React5 min read

useMemo vs useCallback: Differences, Examples & Interview Q&A

Compare useMemo and useCallback with a working React example, dependency rules, common mistakes, and a render-tracing interview exercise.

#Performance#Interview

React~16 min

useEffect: Dependencies, Cleanup, and Common Traps

When effects run, how dependency arrays work, reference stability traps, and avoiding stale closures.

React3 min read

Keys in React Lists: Why They Matter

How keys help React preserve identity and avoid subtle UI bugs.

React3 min read

Components, Props, and State (Interview Essentials)

Core building blocks: props vs state, one-way data flow, and when to lift state up.

React3 min read

React Rendering: The Mental Model

How React thinks about rendering, reconciliation, and why state changes cause re-renders.