React Interview Questions and Answers | React Interview Questions | ReactJS Tutorial | Simplilearn

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In this JavaScript Interview Questions video, you will learn some of the top beginner, intermediate and advanced level questions that are often asked in an interview. You will look at theoretical and practical based questions on several crucial topics of JavaScript.
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🔥Become A Full Stack Developer Today: www.simplilearn.com/pgp-full-stack-web-development-certification-training-course?PGP-FSD-Caltech--dS9pvGqlX8&Comments& Do you have any questions on this topic? Please share your feedback in the comment section below and we'll have our experts answer it for you. Thanks for watching the video. Cheers!

[@arunp.h1463]

8:32 e.preventDefault is not used to check browser errors. Instead preventDefault() method is used to prevent the browser from executing the default action of the selected element. It can prevent the user from processing the request by clicking the link

[@devgabriel6898]

It is quite good! But it missed the main 2018/19 attraction of react... Hooks! With that u can get rid of class components, and use functional components with state management and some life cycle hooks methods as UseEffect(). They re a lot more easier since u dont have to worry about "this." or "bind" anymore. const[example, setExample] = useState(" ") where example is the state, setExample is the "setState" and useState() is the default data that the state hook is biggning with (can be an array, an object, an array of object, string, number, boolean... Whatever.

[@VishalVerma-ye9so]

Correct Gabriel I was confused for bit like hooks are use to manage state in functional components.

[@MahmoudAhmed-mf6lb]

The video is great. Just a note for people who may watch it in the future, React has changed since that time as the video has some old information. Functional components can hold state now through hooks, some class component lifecycle methods are deprecated now, React context is added, redux has a toolkit now which is kinda different than redux without it. event.preventDefault() unlike what’s mentioned in the video, it’s used to prevent the default action of the browser for the event triggering.

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[@SimplilearnOfficial]

Do you have any questions on this topic? Please share your feedback in the comment section below and we'll have our experts answer it for you. Thanks for watching the video. Cheers!

[@manasdwivedi336]

Hello Simplilearn, thanks for the set of questions that are definitely gonna help any developer out there. One simple suggestion is to include hooks and a more deep dive into lifecycle methods. It would be very beneficial to us if you could provide a series with coverage of HTML,CSS,JS,React JS(with redux). Thank you. Keep coding ;)

[@joeldominiclobo587]

I guess you missed "npx" when creating a react app.

[@bohdan90]

Thank you, great vid - very well explained. I have an interview on React tomorrow and i hope this helps!

[@SimplilearnOfficial]

Hey Bohdan, thank you for appreciating our work. We are glad to have helped. Do check out our other tutorial videos and subscribe to us to stay connected. Cheers :)

[@keval_yt]

Thank you simplilearn for the video. The narrator is very nice, such clear speaking helps us to maintain interest throughout the video.👏🏻

[@SimplilearnOfficial]

Thank you for the appreciation. You can check our videos related to various technologies and subscribe to our channel to stay updated with all the trending technologies.

[@IndianChatGPT]

Hey Simplilearn, liked this one as it touches the basics of React. Requesting you for more in depth content on React like using axios to perform CRUD or implement get or post methods.

[@SimplilearnOfficial]

Hey, thank you for watching our video. We will definitely look into your suggestions. Do subscribe and stay tuned for updates on our channel. Cheers :)

[@kamilion100]

This is one of the best vids I've seen on React interviews. Thanks!

[@SimplilearnOfficial]

Glad you enjoyed it!

[@payalmakode3612]

Thanks for uploading this video. It gets really bored sometimes to read interview questions. I just recall all my experience once in a single video. Keep uploading latest one also. Thank you so much again 👍

[@SimplilearnOfficial]

Thanks for sharing that, and for watching!

[@Yan-rv8mi]

21:35 Functional Components are very powerful with React hooks nowadays. It's a trend to replace class components, since functional component can do everything that class components are able to, but also doing it faster than class component and the code are cleaner.

[@SimplilearnOfficial]

Thanks for sharing your input on this topic!

[@saajidhnawwar8505]

@Yan So what are differences between those now?

[@priyankashinde7557]

Very helpful thank you very much, I would like to suggest this vdo to other ppl also

[@igobortolon]

Great video! Clear, concise and objective explanation of React

[@SimplilearnOfficial]

We are glad you found our video helpful, Rodrigo. Like and share our video with your peers and also do not forget to subscribe to our channel for not missing video updates. We will be coming up with more such videos. Cheers!

[@_romeopeter]

Thank you so much for this encompassing ReactJS interview questions, although it should be updated to explain new concepts like hooks, the overall idea is still the same. This will be helpful as I set to take on some interviews coming up.

[@SimplilearnOfficial]

Thank you for the appreciation. You can check our videos related to various technologies and subscribe to our channel to stay updated with all the trending technologies.

[@manoking918]

It's really useful one for a beginner and who needs to place easily..😊😊✌🏻✌🏻✌🏻✌🏻👍🏻👍🏻👍🏻👍🏻👍🏻👍🏻Thanks a lot for this one💐💐

[@SimplilearnOfficial]

WooHoo! We are so happy you love our videos. Please do keep checking back in. We put up new videos every week on all your favorite topics. Whenever you have the time, you must also check out our blog page @simplilearn.com and tell us what you think. Have a good day!

[@manoking918]

@@SimplilearnOfficial Sure♥️

[@laharshmoturi981]

This is a very glance for react for interview TQ so much

[@SimplilearnOfficial]

Hello, thank you for watching our video. We are glad that you liked our video. Do subscribe and stay connected with us. Cheers :)

[@parthchandna7570]

Considering that it's a video for interview preparation, you have mentioned that state is mutable, my friend state is immutable, if it were mutable then setState would not have been required

[@Yan-rv8mi]

15:50 React can be either server-side rendering or client-side rendering depending on how you configure it to. Especially for components that requires API call to fetch data before displaying them on the page, we can do client-side rendering by showing a shimmer before the actual data is returned. This is way elegant than showing a blank page for seconds when waiting for server-side rendering (including the time the server calls the API).

[@SimplilearnOfficial]

Thanks for sharing your input on this topic!

[@firdosaman9290]

It's very helpful.. thank you

[@SimplilearnOfficial]

You are most welcome

[@mathearts9739]

thanks new subscriber here easy to learn

[@SimplilearnOfficial]

Thanks for the sub! We welcome you to our community!

[@Yan-rv8mi]

Life cycle methods in class components are very much being replaced by useEffect, useState and other hooks in functional components. This is trending up since the begining of 2019, so for a video that published in late 2019 I believe it'd be better that you could include React Hooks. Other than that, great videos!

[@SimplilearnOfficial]

Hey Yan, thank you for appreciating our work. We are glad to have helped. Do check out our other tutorial videos and subscribe to us to stay connected. Cheers :)

[@vengateshm2122]

Thank you!

[@SimplilearnOfficial]

You're welcome!

[@devanshishah9481]

Very detailed information

[@SimplilearnOfficial]

Glad it was helpful!

[@vishnyo]

Pretty basic questions. But thanks. Before anything should know these.

[@SimplilearnOfficial]

Keep learning with us .Stay connected with our channel and team :) . Do subscribe the channel for more updates : )

[@manasdwivedi336]

Hello Simplilearn, thanks for the set of questions that are definitely gonna help any developer out there. One simple suggestion is to include hooks and a more deep dive into lifecycle methods. It would be very beneficial to us if you could provide a series with coverage of HTML,CSS,JS,React JS(with redux). Thank you. Keep coding ;)

[@SimplilearnOfficial]

Hey Manas, thank you for watching our video. We will definitely look into your suggestions. Do subscribe and stay tuned for updates on our channel. Cheers :)

[@Mayankkumargeek]

thanks a lot :)

[@SimplilearnOfficial]

You are very welcome!

[@ashwinipote6277]

This is one of the best vedio

[@SimplilearnOfficial]

WooHoo! We are so happy you love our videos. Please do keep checking back in. We put up new videos every week on all your favorite topics. Whenever you have the time, you must also check out our blog page @simplilearn.com and tell us what you think. Have a good day!

[@rohitmeshram1412]

Sorry to say, but this just got me more confused. i have been working with react for some time now. however i did not know all the theory. I may rewatch this after few basics react videos. maybe it will make make more sense to me later. Also saw nothing much about hooks. and i think that is pretty important

[@SimplilearnOfficial]

Thank you for bringing this to our attention. We’re sorry you had a bad experience. We’ll strive to do better

[@Brenosalv]

tkx a lot

[@SimplilearnOfficial]

Thank you for the appreciation. You can check our videos related to various technologies and subscribe to our channel to stay updated with all the trending technologies.

[@gauravsharma4468]

19:38 you exported and imported App in same file . It was suppose to be imported inside app.js not in main.js

[@nikhilshinde5564]

everything is quite informative but one issue, if possible slow down your pace.

[@SimplilearnOfficial]

Thanks for watching our video and sharing your thoughts. Do subscribe to our channel and stay tuned for more. Cheers!

[@PriyanshuChauhan]

Outdated and wrong in 2020 !

[@SimplilearnOfficial]

Thanks for the feedback. We will look into that!

[@ViditKothari]

"require()" isn't a part of Javascript, thus it isn't technically ES5 or native-Javascript feature. Instead it is NodeJS function. same thing goes with "module.exports". Get an expert Javascript engineer before creating such videos and misleading masses. This hints at the kind & quality of education you provide to noobs when they subscribe to your classes.

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[@samggez]

is headache without subtitle, please fix it.

[@SimplilearnOfficial]

We are sorry about that Samco, we will share the feedback with the relevant department

[@devgabriel6898]

I can understand everything with no effort, and im not english speaker :p

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Thanks for the good feedback. Do subscribe to our channel and stay tuned.