Here is my humble contribution: 0:40 - Unidirectional Data Flow 3:05 - Props x State 4:53 - Lift State Up 7:05 - Controlled x Uncontrolled 9:46 - Refs 12:21 - Importance of Keys 17:58 - Context For whoever is reading it: You have gotten so far! You are gonna get the job just believe in yourself! 😊

This is a great video! No non-sense. I'm a pretty experienced React developer and I can confirm that these are actually things that you're going to need in your work.

I am so glad I discovered your channel - thanks for doing such an amazing job explaining everything with so much detail !

One of the best React tutorials out there, and I've struggled with 'em all.

Fantastic set of questions, one thing worth mentioning in relation to Q1 is that it is also referred to as "1 Way" and "2 Way" data bindings, as per the given example, React is 1 way data-binding and Vue is 2 way data-binding. Thanks for sharing

One of the best videos I've seen and I've been already a month preparing for interviews after 6 years of working with React already, but now I want to change to work another place

I agree with others, you've explained things very nicely. I've been using react for a few years and not using the index as a key is important but I've never really dug deeper into it. The way you've explained it, with an example, really clicked! Keep it up!

This was extremely helpful in reaffirming my React knowledge. I've been using it for a while in personal projects and I just found out my company is looking for a React developer. Brushing up in hopes of landing the promotion! Thanks for the video!

Excellent video!!! I am learning React JS and I have found the video very informative, especially when you go over the snippets and explain them thoroughly. Great job, thumbs up 👍

Fantastic video, I use React every day and your explanations were so good that even I learned something new! Keep up the good work!

Thanks Chaim! Looking forward to your future content

I really liked your explanation about using n.id instead of index in key attributes. Amazing stuff.

every answer with a code snippet... tats what makes this video amazing and a lot easier to understand... ThanQ.. Happy Coding..

Thank you so much. The info was clear and precise and it helped me clear some misconceptions too ! Great work!

I am sure every viewer will learn something valuable from this video. Looking forward to more content.

its kind of learning entire core react concept in minimum time possible. Great content.

Fantastic video with basics at one place

great video Chaim, learned so much!!!

This was great ive been learning a lot of react past 6 months and you cleared up a lot. Thanks!

You really give great explanations on crucial topics of react. Thank you!

Liked the detailed explanation. Really helpful. Specifically key and context. It gave me clear idea

I alway watch this kind of video by using 1.25x. but this time I need to a little bit slow it down. Anyway, thanks for sharing these knowledge.

Best video I have found so far, helped me getting prepared for my interview so well.

great explanation, never really had understood unidirectional data flow in react, you made it easy. Thanks

Excelent content and you know how to explain it clearly. Great video!

Love the part about keys. Now I understand why. I knew it was not good for performance but didn’t know why

Great content. Clear and concise explanation and examples. Well done.

Man you are special my brain had to be 💯 focused and not even for a single second I got bored.

I never fully grasped the difference between controlled vs uncontrolled component, but you explained in two minutes what seemed obvious and other documentation I couldn't.

I've learned more in 12 minutes than all the hours I've spent o tutorials. Thank you so much definitely got a new subscriber

This video is so detailed and very nicely explained. Thank you!

Great video, solid explanation on prop drilling and useContext.

This guy knows his stuff. I really enjoyed the video!

You helped me get my current job, every question you mentioned was brought up and I was able to elaborate, you made the concepts make sense to me. I cannot thank you enough. I’m now a lead dev for a new project, loving my job!

one of the best teachers I ever seen

Love this video. A lot of my React learning has come from Udemy there's so much of this that I've learned how to do, but never really understood the "why."

Thanks for the great examples, I learned a lot! Going to your next video :)

Very easy to understand with examples. Thank you

Wow , your the 1st one i didnt have to speed up to 1.5x . Good video!

Super insightful!

Awesome content and up to date. Love it!

Very insightful and full content 👌 👏

This is very helpful interview prep. Thank you!

This guys is awesome in his explanation

Great Content !!! Thank you ..Hope to see more videos like these

You're a great teacher. I'm learning react and couldn't grasp certain concepts until now. Do you have a react bootcamp?

Very useful content! thanks!

This is really video, the concepts are made clear. Thanks Chaim. Love from Oman.

fantastic video. Thorough explanation and a good choice of questions :) Thank you

Thank your for this amazing React tutorial!

thanks for the phenomenal video. cheers

You have a talent for explaining things! Keep doing this. I have a question: what level are these questions? Say I'm someone with almost 2 years of experience. Is this what I should expect or this is something that a more junior/entry level dev would be asked?

Thanks, good sir. I've learned a lot from this one video.

You're probably the smartest instructor I've ever seen. Everything you say is to the point. One suggestion thought, maybe consider making the pacing a bit slower :)

This was so helpful. Thanks. do you have a video explaining Hooks and why they are useful and why are they needed?

I have my first front end technical interview and the material from this video was exactly what I needed, thanks

This....is.....Amazing. SUBSCRIBED

Sweet, I finally get why keys are important, and I'll stop with the key={i} just to quiet warnings

Loved it!

It's crazy how many of these questions I was asked in a recent interview, and I couldn't give convincing answers. If only I had gone through these 14 questions before. Great vid nonetheless, and I found the JS playlist equally helpful. Thanks again!

Great questions and excellent explanation! Thanks for sharing

Sir, this should be my first ever comment on KZfaq and I just want to say that I totally loved this video. I wish I could leave 10 likes all at once. Thank youuuuuuu

Thanks for this wonderful video.

great. i have trouble articulating this stuff but know answers for most part. this really helped me with my soft skills!

this guy deserves a medal

Great video and explanation, thanks!

Great video, detailed explanation of everything, easy to understand. Just have to slow it down to 0.75x

wow you seem to be really an expert at React

you make me smarter thank you. My react iq increases with every video thank you.

Pure Gold 😍

It's an amazing interview tutorial.

Leaved a like to watch/understand later

Great Video

Great Explanation

Nice! Thanks

Do you necessarily have to use "refs" to get the underlying DOM element, can't you use document.querySelector() for that. I am new to react. Would love an explanation.

Did I miss something here? What actually happens when a user types something into the input field of the uncontrolled component and then hits the button, that this component has? Otherwhise..great content, really gives me some insight!

Wow sir tht was an amazing tutorial, U hve just rocked sir, Sir ihve one request plz keep making interview tutorial like this on react, Tqu sir lots of love and support from india 🇮🇳

this was helpful

'Lifting State Up' question : You didn't mention the main point that I think is the core to the answer to that question - When we lift the state up then we call a method in the child component that in turns calls the reference to a function that was passed as a prop to the child from the parent component. This is done in order to update the state in the parent component because updating the state of parent component cannot directly done in child component. In this way we kind of lift the state up from child component to parent component which ensures that parent is aware of the fact that child is requesting the state to be changed potentially because child relies on the updated value of that state. I am not able to understand your point for this particular question in the video. Could you please explain?

17:28 , if we use index as keys in the list( not recommended ) , and delete a certain element of the list , does react delete it from the actual DOM rather than the virtual DOM ?. Is that the reason why the whole list gets refreshed ? please elaborate

Very efficient

Would you make a learn react tutorial? I feel like you’re an amazing teacher and it’d help a lot

Amazing

Thanks a lot

A-w-e-s-o-m-e video

Hi Chaim, I have a question about context What if i have grandchild component in a separat file than how would i get the access to Context that you have declared globally at line no. 4?

omG I had to set the video to 0.75 haha. Very cool btw, thank you

8:15 Line 23, no wonder that the component is out of control. :)

is this a good idea to use index for key in list item?

Great

Plz, record tutorial "How to work with react-google-maps" with customization / markers / tooltip for markers, or just clone map from airbnb)

Thanks

I'm only half way through. Holy fucking shit, Amazing, thank you, sir.

very easy questions

A am glad i am actually expert... 😁

hi there chaim, which course do you recommend to learn react... i was planning to go with maximillian's course on udemy

I got big interview tomorrow haha 7 months after that one I bombed

Exceptional video, thank you.

In your "Controlled vs Uncontrolled" question : Would your input reflect the keypress changes in case of Uncontrolled component? This part is not shown in the video.