React Coding Interview Prep – 30 Questions and Answers

Prepare for a React interview or improve your React skills by learning about 30 common React JS interview questions and concepts.

⭐️ Course Contents ⭐️
⌨️ (0:00:00) Introduction
⌨️ (0:00:43) Map and Filter
⌨️ (0:20:06) States in React
⌨️ (0:33:33) Props in React
⌨️ (0:40:34) Inline Conditional Expressions
⌨️ (0:52:04) Event Handling in React
⌨️ (0:57:41) Keys in React
⌨️ (1:03:25) Forms in React
⌨️ (1:18:04) Dynamic Inputs in React
⌨️ (1:26:02) CSS Styling in React
⌨️ (1:36:47) Uncontrolled v/s Controlled Components
⌨️ (1:44:10) Virtual DOM
⌨️ (1:46:05) InnerHTML in React
⌨️ (1:55:23) React Fragments
⌨️ (2:00:02) Stateless v/s Stateful Components
⌨️ (2:01:57) REST API Requests
⌨️ (2:27:05) Debouncing in React
⌨️ (2:38:43) Context API in React
⌨️ (2:49:33) Class v/s ClassNames in React
⌨️ (2:52:59) Higher Order Components
⌨️ (3:06:18) Lazy Loading in React
⌨️ (3:14:34) Helper Functions in React
⌨️ (3:24:21) Implementing Recursion in React
⌨️ (3:27:10) Running Arrays of Functions
⌨️ (3:33:08) Custom Hooks in React
⌨️ (3:37:22) Promises and Async/Await
⌨️ (3:51:52) Code Splitting in React(Dynamic Imports)
⌨️ (3:58:18) Creating a Search Filter in React
⌨️ (4:13:10) Adding TypeScript to React
⌨️ (4:16:36) React Testing Library
⌨️ (4:30:41) Caching an API Response

🎉 Thanks to our Champion and Sponsor supporters:
👾 Raymond Odero
👾 Agustín Kussrow
👾 aldo ferretti
👾 Otis Morgan
👾 DeezMaster

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[ermirakajtazi]

Thank you, this is a great video covering all the fundamentals that a developer should know. Keep up the good work!

[VikashKumar-tgot]

This is one of the best video i ever watched for react.js, Thanks to you.

[DevAditya]

This video is enough to Brush-up your knowledge 🔥🔥

[ajiteshmishra]

right on time, been searching for interview questions form weeks.

[demniker]

That debouncing part was such a cool technique. Can't believe I just learned it now.

[Diabeticode]

While I appreciate how these topics are fairly straight-forward in terms of covering the absolute fundamentals there isn't really an explanation or reason as to when or why you'd use these specific things...though I suppose individually you find use cases in which to use certain concepts, it's more difficult to solidify and commit these tutorials to memory if it's just a "follow along with my code" without the teaching behind it

[arularasiselvaraj]

Seriously a great video for preparation, Thanks a lot

[jasonnguyen]

I will have some coding interviews for junior reactjs next week, thank you so much for the video

[_vedantshinde]

Great job sir really appreciate ur content

[gabrielfono]

I have an mid-level ReactJs interview next week with deloitte and hopefully this will help me refresh for sure

[shi-nee]

WOWWW thanks you so muchh i always wanted to such a vid cuz im very afraid of interview ques n things

[ivannikolic]

Good explanation and it is a
very good video

[mudassirsayed]

Awesome content....
Missing Error Boundaries, Render Props, React.memo, Forward Refs and Pure Components

[avinashvagh]

Kudos to all ppl gonna watch this whole video, I started ⚡

[carlosorozco]

Thanks a lot, I really appreciate it, thanks thanks ...

[romanbrandt]

Using the callback syntax in the `useState` setter function ensures that the update is based on the previous state value and is the correct way to manage state updates that depend on the current state. It helps prevent issues related to stale state or race conditions, ensuring the correctness of the state update process.

[remixowlz]

4:06:00 useEffect with dependencies = componentDidUpdate

[dasdisdus]

I don't know but i can understand debouncing easily here than others. Thank you so much.

[AvinashKumar-vpqo]

FCC sure is on a roll these days.. damn I am almost salivating 🤣🤣

[tomasreynoso]

which vs code pluggins do you use that autocompletes?
Thanks