React Interview Questions | ReactJS Interview Questions and Answers | Intellipaat

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In this React Interview Questions and Answers you will learn the latest and top questions asked by companies for React interview. This ReactJS Interview Questions & Answers video covers all kinds of questions starting from basic to advanced questions so that you can get benefited. We can assure you that if you watch this React interview preparation video completely you can crack any React job interview easily.
#ReactInterviewQuestions #ReactInterviewQuestionsandAnswers #ReactJSInterviewQuestions #ReactTraining #ReactCourse #Intellipaat
👉Following questions are covered in this video:
00:00 - React Interview Questions
01:12 - Differentiate Between Virtual DOM and Real DOM
03:10 - What is React?
04:32 - What is the meaning of Virtual DOM?
05:51 - What are some of the important features of React?
07:24 - What is the meaning of JSX?
08:41 - Can browser read a JSX File?
09:53 - Why is React widely used today?
11:48 - Are there any Disadvantages to using react?
13:32 - Differentiate between Angular and React
14:44 - What is the meaning of the component based architecture of react?
15:56 - How does rendering work in React?
16:55 - What are states in React?
18:37 - What is the use of an arrow function in React?
19:47 - What is a higher-order component in React?
20:56 - What us the meaning of create-react-app in React?
21:52 - What are some of the advantages of using create-react-app n React?
23:00 - What is the meaning of Redux?
24:19 - What is the difference between props and states?
25:21 - What are the three phases of a component life cycle in React?
26:48 - What are events in React?
27:47 - How are events created in React?
28:45 - How is routing in React different from conventional routing?
30:25 - Differentiate between Flux and Redux in React
32:00 - Can AJAX be used with React?
33:06 - What is the meaning of synthetic events in React?
34:05 - What are stateful components in React?
34:57 - What are refs in React?
36:04 - What are Controlled Components in React?
37:02 - Why is a router required in React?
38:11 - What are the components of Redux in React?
39:12 - What are the advantages of using Redux?
40:37 - What are the disadvantages of using MVC in React?
41:58 - What are pure components in React?
43:04 - What are higher-order components (HOCs) used for?
44:02 - What are keys in React?
45:06 - Differentiate between a controlled components and an uncontrolled components in React
46:05 - How can you tell React to build in the production mode?
47:40 - What is the use of the second argument that is passed to set state? is it optional?
49:33 - What is the Strict Mode component used in React?
50:25 - What would you do if your React application is rendering slowly?
51:50 - What would you do if react application is rendering slowly?
54:26 - What are the predefined prop types presentin React?
55:13 - What is React Fiber?
56:02 - What are Hooks in React?
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Why should you learn React.JS?
React is a JavaScript library that specializes in helping developers build user interfaces, or UIs. React on its own is a very functional, modular way to create expressive UI, and with its single responsibility mentality, it can be integrated with other systems as well as utilize its own ecosystem to develop full single page and multi page apps.
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[@Intellipaat]

Guys, what else do you want to learn from Intellipaat? Comment down below and let us know so we can create more such tutorials for you.

[@rajav4861]

Please make tutorials on C++ STL 🙏

[@danielumukoro2854]

can you pls make a video on top coding questions companies ask for interview

[@Intellipaat]

@@rajav4861 Alright noted. Will upload soon.

[@Intellipaat]

@@danielumukoro2854 Yes of course. Give us some time.

[@ElevateTheFacts]

can you provide the ppt of this as soon as possible want to study from this for my next interview.

[@chandramouli39]

Angular is bi directional whereas react is uni directional, Flux has multiple stores whereas redux has a single store. Not sure why these basic concepts are wrongly presented.

[@NidheeshAloorDharmarajan]

Thats what I also thinking

[@arjunnayak9088]

This guy reading out the slides is Chatur Ramalingam

[@hahashir]

i stopped watching at this point. i wonder what else is wrong in this video

[@krishnendusekhardas]

Also angular has support of server side rendering

[@computeraidedyami]

@@SwapnilWaghme Chatur Ramalingam is the best

[@sirajahmed8034]

14:15 this is actually the reverse, it's angular that supports two way data binding, React only supports uni directional data binding.

[@capitaltrading8809]

Absolutely

[@user-gs1yh9ft5u]

Yes I also noticed that he is wrong

[@giselcalvo8693]

Slide 24, Flux has multiple stores and redux has a single store

[@Intellipaat]

HI Gisel, Kindly be informed that Flux architecture has multiple stores that are coordinated together by the dispatcher, and when there is a change all the stores need to update themselves. But in Redux we have a single store. A single store that handles the entire application. Any changes to the store are done through actions.

[@taykoko1]

@@Intellipaat that's not what you said in the video

[@jsbundle9422]

Slide #9 it's the wrong thing. React supports one-way data binding and Angular supports Two-way data binding.

[@MrProbin]

13:09 react unidirectional angular two way data binding......and thanks for best interview video

[@Intellipaat]

Welcome🙂

[@georgejames5488]

Angular can do 2 way data binding. Angular can do server side rendering as well now.

[@zathkal4004]

Thousand thanks sir... this video deserves way more view !!!

[@AnonYmous-yu6hv]

No don't put arrow functions in render, it will create a new function on every render and it will slow down the app.

[@kunalpatil1250]

we can directly manipulate real dom in react using useref hook.

[@DrunkenEngineer]

Thank you very much for this video. Really helps in cracking Interviews. Even we share real time Interview Experiences.

[@paulfleischer-djoleto4429]

I think you have to take a second look at the video. Question 24: "difference between flux and redux." You said flux has a single store and redux has multiple stores. The answer is wrong and misleading for a person preparing for an interview. Please, kindly withdraw this video and correct the mistakes. Thanks.

[@Sanketda]

ReactJs is a UI library where Angular is Complete framework.

[@adityamittal4357]

At 14:45 you say Angular is unidirectional only for data binding and react supports two-way data binding. That's wrong. Angular supports both two-way and one-way data-binding.

[@mayukhchakraborty5364]

Thanks for the good work😀😀👍👍. This video as well as all other courses really helped me out.. and hats off to intellipath to really dedicate themselves into this soo much🥰🥰

[@Intellipaat]

Glad it was helpful. :)

[@pankaj2129]

#13. Props can pass data from child component to the parent component by call back functions written in the parent component. Pls rectify this one

[@mdridoy-ef2pw]

at 13:42 data binding factor is wrong. Angular uses two-way data binding and react uses one-way data binding.

[@gustavo9758]

Hi there man, this is good stuff but in contains some mistakes already mentioned in the comments, you may want to re-upload the video with some edition to clarify those.

[@dimabreezy2000]

I'm not agree with the statement that React is just view. With current context + hooks it can be used as a controller, and you can write models with typescript. React + Typesript = MVC

[@AMANKUMAR-tm8fx]

so helpful for me because I go for the interview of React js today ❤❤

[@Intellipaat]

@AMAN KUMAR Glad you liked it, Do like, share & subscribe to our channel to get updates on upcoming videos.

[@asim-gandu-phenchod]

14:41 react is for client side too

[@kumar-jatin-2000]

Have an interview tomorrow wish me luck 🤞.

[@Intellipaat]

All the best😊. Do like, share & subscribe to our channel to get updates on upcoming videos.

[@kishorgwala]

Guys now days lot of question's are covered on React Hooks.

[@vlogsdiaries4250]

Such a useful Content. It cleared all of my doubts 🔥

[@Intellipaat]

Glad you liked it 😊 Do like, share & subscribe to our channel to get updates on upcoming videos.

[@acecrickettv]

Superb 🤝. Small clarification. React is one way data binding. 13:47

[@Intellipaat]

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[@rajbannasa7662]

Thank you so much sir for the lovely efforts ❤️

[@Intellipaat]

It's my pleasure @Raj Banna Sa Do like, share & subscribe to our channel to get updates on upcoming videos

[@DeeBhu]

slide no.9 data binding info is wrong, please correct it.

[@Sivabv]

Angular has two data binding vs react in unidirectional….. please check and update..

[@patcoston]

37:20 As of react-router-dom v6, we now use Routes instead of Switch and element instead of component.

[@Intellipaat]

@Patrick Coston If you wish to get Personal support Kindly call our advisors on IND : [phone] US : 1-800-216-8930 (Toll Free).

[@piyush93688]

thanks.

[@hamzayousaf6103]

very informative video, my question is which country and plateform is better for applying for a react dev remote job.

[@Intellipaat]

@Hamza Yousaf Glad you liked it 😊 Do like, share & subscribe to our channel to get updates on upcoming videos.

[@richujain]

Hey thanks for sharing all these. Great video. I only have a single doubt. When you were talking about the differences between flux and redux, you mentioned flux has only one store and redux have multiple stores. Isn’t it the other way? As in flux have multiple stores and redux has only one store. I’m new to react, correct me if I’m wrong.

[@Intellipaat]

@Richu Jain If you wish to get Personal support Kindly call our course advisors on IND: [phone] US: 1-800-216-8930 (Toll-Free).

[@siddhantsingh1784]

yes Flux has multiple stores where as Redux has only one they hv made mistakes in certain parts of their presentation

[@anilrawat0303]

React support client side supporting using next js we can acheive the server side rendering.

[@Intellipaat]

Thank you all for your active participation. SUBSCRIBE to Intellipaat to find out the right answer.

[@danielmaina4942]

Just what I needed. You covered almost everything I could think of concerning a react interview ! Thanks Intellipaat!

[@Intellipaat]

@Daniel Maina Glad it was helpful! Do like, share & subscribe to our channel to get updates on upcoming videos.

[@rahulmule955]

It is really important for point of interview

[@ankitgiri6874]

your video is kind of quick crash course Thanks.

[@Intellipaat]

@Ankit Giri Do like, share & subscribe to our channel to get updates on upcoming videos.😊

[@shankarpehalvansiva1671]

Good work

[@Sandeepyadav-sp4sm]

Thankyou so much for this wonderful session.

[@Intellipaat]

Most welcome 😊 Do like, share & subscribe to our channel to get updates on upcoming videos.

[@somu21083]

at 14:27 , its mentioned that react is two way data binding , however react is one-way data binding , isnt it ?

[@Intellipaat]

Do like, share & subscribe to our channel to get updates on upcoming videos.

[@mdramish1259]

God would bless your channel if you attach a document to read the slides

[@Intellipaat]

Thank you so much for appreciating the content. Your feedback motivates us to make more such content. Unfortunately, we don't share the source code or presentation deck with anyone. Although, if you wish to learn from Industry Experts and IIT Faculty, do fill out this form and we will reach out to you. Have a great day! . Google Form: forms.gle/XWy7MtQPrHkgq7Pt7

[@vibelover5444]

These are almost based on Class based components, please upload functional component interview questions!

[@Intellipaat]

Alright. Next time.

[@peacehuman3963]

Thank you

[@Intellipaat]

Welcome.

[@mannahailemariam9197]

Hi Intellipaat, thanks for your dedicated work in helping anyone ace the react interview questions! Being said that, please correct the stated difference between Flux & Redux for that redux used a single store where as Flux do multiple. Thanks

[@Intellipaat]

@Manna Hailemariam Glad it was helpful! Do like, share & subscribe to our channel to get updates on upcoming videos.

[@raxitlakhatariya5915]

thank you so much for such awesome content.

[@Intellipaat]

Glad you liked it 😊 Do like, share & subscribe to our channel to get updates on upcoming videos.

[@codewithteni]

wow, i didnt notice i spent hours listening to this..... this is beautiful

[@Intellipaat]

@Ganiyat Yakub Thanks for watching😊 Do like, share & subscribe to our channel to get updates on upcoming videos.

[@rahulshaligram9998]

You have covered a lot in this video sir

[@Intellipaat]

This is just an overview of the subject. If you wish to learn from top experts and get a certification, then kindly call our course advisors on IND: +91-7z022374614 US: 1-800-216-8930 (Toll-Free).

[@deepakchalla9245]

I think react is one way binding and angular is two way!

[@Intellipaat]

@Deepak challa For personal support you can reach out to our course advisors on IND : [phone] US : 1-800-216-8930 (Toll Free).

[@shubhambhardwaj2054]

some 'vs' answers have wrong data

[@shainoissac9451]

How to delete a row in reactt?

[@CodeSuraZz]

31:10 Redux have one global store where as Flux can have multiple stores.

[@Intellipaat]

@Suraj Poddar We appreciate your active participation😊. Do like, share & subscribe to our channel to get updates on upcoming videos.

[@Sivabv]

Please update this video with recommendations…

[@Intellipaat]

@Siva Kumar For personal support you can reach out to our course advisors on IND : [phone] US : 1-800-216-8930 (Toll Free).

[@martinjoshevski3754]

Nice Q & A! Thanks

[@Intellipaat]

@Martin Joshevski Glad you liked it! Do like, share & subscribe to our channel to get updates on upcoming videos.

[@SupunPraneeth]

why still uses classes? fucntions are way better and faster, and it not messy as classes

[@paulfleischer-djoleto4429]

You are right. Classes are outmoded. But they are required in interviews. A react developer must be able to maintain legacy react systems. So, classes, though outmoded are still relevant in interviews.

[@yugandharsurya]

31:45 flux has multiple stores.

[@Intellipaat]

@yugandhar's world Do like, share & subscribe to our channel to get updates on upcoming videos.

[@AmitSingh-xc9qe]

Very valuable talk

[@Intellipaat]

Glad you liked it 😊 Do like, share & subscribe to our channel to get updates on upcoming videos.

[@me_079_aashishkumarnayak6]

Useful content❣❣

[@Intellipaat]

Glad it was helpful! Do like, share & subscribe to our channel to get updates on upcoming videos.

[@abhilashs3419]

25:04 props are immutable

[@rishavharsh6520]

Question 9 answer has error, react does not support 2 way data binding, Angular supports 2 way data binding. but here it was wriiten wrong

[@Intellipaat]

Thanks for pointing it out, I'll correct the error in Question 9 regarding React's data binding.

[@aneesahmad1258]

Please correct. React is unidirectional while Angular is biDirectional

[@Intellipaat]

@Anees Ahmad Thank you for active participation. SUBSCRIBE to Intellipaat to find out the right answer.

[@manumohan6008]

React Does not support two way binding right

[@Intellipaat]

@ManuMohan Do like, share & subscribe to our channel to get updates on upcoming videos.😊

[@milindbadekar3503]

You have to work on explanation part

[@Intellipaat]

Sure! Meanwhile, Do like, share & subscribe to our channel to get updates on upcoming videos.

[@ZahidKhan-th8pz]

Angular is 2WayDataBinding and react is 1WayDataBinding 😞😞😞

[@spideymemes7284]

How can we create a game

[@Intellipaat]

What kind of game?

[@Pavankumarsinglavqrdoor1242]

@@Intellipaat spideman

[@vandanasingandipe2203]

how can we get this slides

[@Intellipaat]

Please share your e-mail ID so that we can share the required files.

[@anupamsharma7031]

The video is superb but @31:55 how can redux has multiple stores ?

[@Intellipaat]

@Anupam Sharma Do like, share & subscribe to our channel to get updates on upcoming videos.

[@SumitKumar-rr5jt]

Can u share pdf

[@Intellipaat]

Thank you so much for appreciating the content. Your feedback motivates us to make more such content. Unfortunately, we don't share the source code or presentation deck with anyone. Although, if you wish to learn (course name) from Industry Experts and IIT Faculty, do fill out this form and we will reach out to you. Have a great day! . Google Form: forms.gle/XWy7MtQPrHkgq7Pt7

[@astronaut22]

react js is unidirectional

[@panjikarmohit]

37ques

[@Intellipaat]

Do like, share & subscribe to our channel to get updates on upcoming videos.

[@vipinagarwal18]

Roooters 😂

[@ricardorien]

Your accet makes everything hard to understand, sorry

[@Intellipaat]

@Ricardo Sure! We'll work on it. Meanwhile do like, share & subscribe to our channel to get updates on upcoming videos.