Every React Concept Explained in 12 Minutes

[@wass3411]

Software Engineer using React daily for 6 years now and this is hands down the cleanest explanations of those concepts I ever saw. Sharing this everywhere.

[@whatever-s3e]

it is clear for you because you were already working for six years on React

[@ironialol]

@@whatever-s3e It was also very clear for me and I'm just learning React buddy :)

[@laptoprelaks]

should've have tis video long time ago... when im learning at such micro level i just dont understand why its like this or that

[@iMVX]

@@whatever-s3esounds like a skill issue here a lil bit

[@jay_wright_thats_right]

Umm, no. This is just a refresher for you. Put yourself in the shoes of a newbie. Y'all forget the beginning so easily.

[@AmineChM21]

"class" to "className" isn't to make it camelCase as "class" is already camelCase. It's to avoid conflict with the JS keyword "class" for creating classes.

[@dota2-plays-shorts]

That's actually right

[@seannewell397]

_solidjs enters the chat_

[@szyszak]

You can't decalre a class inside JSX though. You can also use this seemingly reserved keyword between JSX tags, like class. React team can update their JSX parser to allow using the "class" and "for" attributes, but I guess it isn't really a pressing matter.

[@nivethan_me]

@@szyszak when you write class you're telling put the string "class" inside a tag. when you want to escape into javascript world you need to use the brackets { } so try writing { class } now you'll get an error since class is a reserved keyword in javascript and React is just Javascript end of the day.

[@bobwilkinsonguitar6142]

​@@nivethan_me when you write className in JSX, you're doing it inside , which also should tell the parser you're not using the class keyword. It's an arbitrary change

[@anil4real_]

This is the most cleanest and concise explanation of react concepts ever

[@RafaelBarbosa-yp9ii]

Man, this was the best class I've ever had on everything I learned in programming. I already knew most of the concepts but the simple way you exemplified was excellent. I will watch your other videos.

[@gustavo-santos-dev]

Awesome content, as a backend engineer that is starting dealing with React, this is pretty straightforward and saved me a lot of time.

[@Omar-sr1ln]

Never heard such a great round up of react , awesome vid man 👍🏻

[@TheCodeBootcamp]

My pleasure. Any more topics you'd like me to cover?

[@knecks7374]

@@TheCodeBootcamp Can you do react advanced topics only. Like , proper advanced stuff that is often used too. Or maybe , as a second idea , a list of commonly used libraries and the like.

[@TheDjTotzy]

Using index as a key is ok for rendering UI derived from an array that doesn't have to change the order of it's elements. But when you have an array that does change the order of it's elements you gotta use a unique key (usually the id of that data item coming from the DB)

[@jay_wright_thats_right]

Don't be that guy. LOL. It's a 12 minute video, not a comprehensive video.

[@mrhino]

@@jay_wright_thats_right good information to know though, he's just adding on to the info from the video

[@Chillycloth]

Molim se da vaša velikodušnost prema nama bude nagrađena. Ovaj video je odličan poklon

[@moviespalace17]

On 5:42 the function handle click should have the setLikes method instead of setClicks

[@1mlister]

Thank you. I thought it should be. I was just staring at the freeze frame trying to figure it out..

[@EnigmaWebcraft]

exactly am also thinking that and find someone also notice this....

[@HamzaAli-i5i3q]

Just came to comments to confirm this, thanks buddy ☺️

[@aviver26]

@@1mlister Same... I was confused for a bit there

[@AntonyJoseph-im9xq]

This has to be the best react speed run ever means a lot bro thank you.

[@hijazi479]

00:01 Understanding React Components and JSX 01:36 Passing Data in React Components 02:58 Key prop in React for component identification. 04:28 React uses reconciliation to update the DOM and manage events using event handling and state. 05:58 Controlled components provide predictable behavior 07:31 React components purity and usage of strict mode 09:00 Using Context and Portals in React 10:32 Tools like Create Portal and Suspense enhance React components.

[@TheCodeBootcamp]

Thanks for this. Just added chapters.

[@eliteiel9747]

Ive been coding React for 4 years now and this is an amazing explanation of the entire thing, also love the humour from time to time, very well placed.

[@pixel8eddie]

This is a great resource for anyone learning React: accessible, concise, and fun. I just shared it with some devs on my team who have been learning React, and they found it the most helpful of everything else they've studied.

[@visajpanchal6789]

Damn, its my 3rd day of learning React and you already taught me a lot.!! What a great way to explain, so much easy explanation and best visuals

[@moustafamohsen]

I'm a senior Angular developer, but wanted a quick way to pickup React, and I have to say this video is amazing, it doesn't get hanged up on the details and explains the concepts with text and examples, along with the reasoning as to why it's implemented this way, in addition you referenced the most used common patterns which is a great touch Just a great video!

[@dikshantluthra5077]

great work man,I just revised react in 11 mins,Keep growing!!

[@bichaudjean-marc4948]

Learning React for 2 weeks. Your video really helped me to make sense of a lot of code in my project 🎉

[@JuuzouRCS]

This is the best experience of learning React I've ever had! Months of practical knowledge easily digested in minutes!

[@suyogmahangade8434]

Best video ever to brush up most of the react concepts 😊

[@srsh12345]

Great video. As somebody learning React and already familiar with some of these concepts, this really helped me grasp the bigger picture much faster. Thank You.

[@elsaman]

I love it. you have exceptional content creational skills

[@Jai-xq5hi]

Very smoothly explained and so clear and concise.

[@afrosoul4eva]

Damn this is the most clear explanation of React. Everything is on point.

[@VoiceHole]

lol i been teaching my self react for 2 years and this just put all the pieces together for me so well haha.

[@bhargavkumar]

Amazing video. Got me hooked. I think you should do this for other technologies as well, like Node & Express and Databases

[@digitalClay]

Been studying React for 6 months now and I could have just watched this video. Essential and to the point thanks!

[@karolbielen2090]

You really must understand a topic deeply to be able to explain it so succinctly.

[@elisabete_costa]

I’m impressed. You were able to explain a lot of concepts in under 12 minutes. I would definitely recommend this video to someone just getting started with React. 👏

[@princereyes5400]

hope you could do something like this in data structures and algorithms.

[@Shashank-my1fv]

One of the finest React JS video explanation . Deserves a million views!!

[@maxkalashnyk3378]

I very rarely leave comments on KZbin but it’s the best video about basics of React. Thank you!

[@AustinTFordham]

You deserve a hug and some sort of reward like a medal or a cake. Thank you so much for posting this, I made the mistake of starting with ReactNative, so circling back to React is now easier thanks to you! Cheers!

[@MiaTheDreamer]

You are right..

[@chiragthakur430]

This was a great explaination. Working with React for the past 3 years and this was a wonderful refresher for me and a great recap for new developers.

[@wlockuz4467]

Never use indexes as keys, it can lead to behaviours that are very hard to debug, especially if the underlying list is modified.

[@omagadavid9923]

What can we use instead

[@wlockuz4467]

@@omagadavid9923 for all practical cases, for example users, products, posts etc. there should be some unique identifier already present, so you should always use that.

[@tigabumunaye9778]

I use crypto.randomuuid

[@samibhadgaokar2326]

Then what is alternative for index as key

[@KarthicRaghupathi]

You should never iterate over an iterable that will be modified. You must create a copy of the iterable for the loop and modify the original iterable separately.

[@himanshusehlangia]

Please make more videos like this. These are very helpful for a quick revision during interviews.

[@user-th2cp8uh8r]

Im in love of these kind of presentations of concept. I watched a lot of videos like these(every religion explained, every ideology) and its actually a good way.

[@CodeNessa]

Wow, thanks for the information! I really learned a lot from you. I am a React beginner, and this will help me complete my project. 🤓

[@meghabathla7167]

He explained every concept precisely ❤

[@weiweicoding]

3:19 If possible, it is not recommended to use index as key, good video!!

[@heyyounotyouyou3761]

Why?

[@eee012]

@@heyyounotyouyou3761the key is meant to tell react reconciliation when an item in a list changes so it doesn’t need to do rerenders on items which haven’t changed. If your list changes order then the index is not reliable as a key.

[@afonsopimenta]

@@heyyounotyouyou3761 React uses the "key" prop under the hood to know which elements were kept the same and which ones were added/removed in the next render when a mutation of the list happens. The problem with using index as the "key" is as follows: imagine we have a list containing the strings ["a", "b", "c," "d"], iterating over the list and giving them the index as the "key" prop would generate the following - lets say we remove the string "b" from the list, the map function would generate , as you can see, the elements with the text "c" and "d" now have different keys, so, instead of react knowing the element with the string "b" was deleted, it thinks the element with the string "b" was changed to have "c", the element with string "c" was changed to have "d" and that the "d" element was deleted. This makes react re-render 3 components unecessarily instead of just 1. This might not be a big deal for short lists, but for big ones, it's a huge performance loss. Hope this helps. And if you still don't understand, feel free to ask questions 😄

[@al3xg.0]

@@heyyounotyouyou3761 when you render a list of items that can be modified (for example by removing elements) the index will shift and you may see some inconsistencies on the page. If the key is based on a property of the item, then the behaviour is always consistent

[@GreatTaiwan]

Why???

[@wajdwael8775]

You have a unique way of explaining things. Keep up the good work!

[@dvrk6140]

I am happy about the memes used throughout the whole video more than the fact that this video helped me learn concepts i didn't get previously

[@gunasekharkoppanati]

Great video! Super concise and a quick way to level up React knowledge. Appreciate the clear explanations.

[@nuru484]

Complete React Tutorial in less than 15 minutes. That's incredible.

[@Learning-w4c]

Such a Great video! I spent a worth watching 12 mins Good stuff man!! Kudos

[@ignrey]

I love this explanation so much, I'm literally taking notes out of this video.

[@uscjake868]

100% the best introductory video on youtube. Great job.

[@zNeoDev]

This is the best React video I have seen on the internet since I've first learned React.

[@MuhammadBasurah]

watched this 1 time.. will comeback for sure

[@Mdrn1986pl]

Awesome video. Especially for someone who worked with React before and needed some kind of refresh.

[@ibrahimdarvishi1929]

This is the greatest explanation of react that i have ever found. Thanks for your awsome video

[@ThomasPGeorgeCSB-]

The best video on React! Extremely clear and concise

[@Q-Productions23]

Your videos are awesome ❤❤. Can you make more of these types of videos for other programming languages? I’m sure nobody has done what you’re doing. It’s remarkable 🎉🎉

[@anthony143]

Wow! , As a Vue developer, I did not expect that React's concept is almost the same as in Vue but just a different syntax. I'm really excited to switch to React now since it has more job openings 😊.

[@prajwalk6685]

wow awesome explantion of all react concepts in a simpler way . Please also make a video on next JS also

[@jelanah_]

might be the best video ive ever watched

[@tapestryofgrace5]

Clear explanation! Excellent work here. Thank you 👏👏

[@alii2284]

This guy is underrated. Thank you man

[@siam1991]

Thanks for clearing this... i really loved how you explained it

[@Sahil.1]

As a dev who's getting his hand into react this video is piece of art

[@lukewood2662]

I didn't get to React yet, but I perfectly understood almost everything here. I guess focusing in getring a decent base in JS does works pretty well, huh... Anyway, awesome vid.

[@MrxyzOfcl]

Need: "Every Svelte Concept Explained in 12 Minutes" Thanks❤

[@lammmpo]

"It's much easier to reference the actual Dom element istead of attempting to do it the fuckn React way" I really apreciate this suggestion

[@brittoarockiasamy8321]

00:01 React components are the building blocks of every React app 01:36 Understanding how to pass data and components in React using props and children prop 02:58 Key prop in React 04:28 React uses reconciliation for updating the DOM and handling events. 05:58 Controlled components ensure predictable behavior 07:31 React components need to return the same output for the same input to maintain purity. 09:00 Using ref for direct DOM manipulation and context for prop data passing 10:32 Create portal and suspense can improve user experience.

[@VaibhavShewale]

well that was interesting a nice way to brush up some concept faster

[@razaceme31]

Very simple and neat explanation.

[@akshaypatelindia]

Thanks for really wonderful representation in simple terms would defiantly recommend your channel :)

[@khaouitiabdelhakim]

Thank you so much for such a great video, you have explained almost every needed concept; keep it up bro

[@phpsoftwareengineering]

Great video! I love how you added a bit of Foley as well. 💯

[@Absoon5]

Thanks man a very clean and straightforward explaintions.

[@thislife1980]

The more I watch this, the more I appreciate vuejs.

[@LucasIlliano]

So clear! Thank you for this video!

[@milkdrom3da]

As a MERN stack dev of 1 year...... I learned a lot today

[@almatnarmatov]

bro this is the best tutorial on react

[@tylermorales9043]

34 second in and I can already tell this is gold

[@1337bitcoin]

Using react again after 4 years and this was an awesome refresher!

[@tochimclaren]

I like how every react dev talk down on HTML whilst in fact they are writing HTML with extra steps.

[@lilyshevchenko7048]

I nominate you for Javascript Peace Prize! That is hands down the most effective and succinct overview, plus the ironic use of comic sans and papyrus font made me fall in love! lol 😆

[@stephenokpalaononuju6975]

This is the most interesting comment section that I have come across on KZbin!!!

[@NeHaSingh-dw4pn]

Best explanation just looking for something like that to clear concept🎉

[@dumolwenkosigwetu6943]

Your tutorial is so insightful Sir. Thank you so much.

[@rcherrycoke7322]

Great video - very concise and clearly explained

[@frankie_goestohollywood]

Love your video! @5:41 - Should the update function inside of the handleClick function be setLikes, instead of setClicks? Thank you 🤓

[@TheCodeBootcamp]

Yes, typo

[@andredelacerdasantos4439]

Notes - React is a JS LIBRARY, not a framework. - COMPONENTS are the building blocks of React. They allow us to make all the visible parts of the app (bottons, inputs, entire pages etc). Every compontent is a JS function that returns JSX markup. JSX attributes come in camel case. - {curlyBraces} are used to pass JS PROPERTIES. - Only one PARENT ELEMENT can be passed to a component. Either pass everything inside a (or another HTML) tag or an EMPTY COMPONENT, a react fragment - PROPS are a way to pass data from one component to another. Props are passed in the component and are then used in the component you passed it to. Anything can be passed as props, including other components. export default function Component(props) { return ( { props.text } ); }; - The KEY PROP is used so react can tell one component apart from another (usually when creating a list with .map). - RENDERING is the process of displaying and updating the UI. Rendering is done using the virtual DOM or VDOM. Document | HTML / \ Head Body / \ / \ Meta Title h1 h2 1) If the state of the app changes, react updates the VDOM. 2) Then, it uses diffing to compare the updated VDOM to a previous version of the VDOM. 3) Once it sees what's different, it uses "reconcilication" to update the real DOM. - EVENTS are actions that occur in the browser, such as click, input, submit and focus. - EVENT HANDLING is how we take those events and do something with them. EVENT PROPS are passed to the HTML element. . /> . /> . /> function Alert() { const handleClick = () => { alert('Clicked') } return ( Click me! ); }; - We manage data in React using STATES, which are like snapshots of the app at any giving time. To manage states, we can't use JS variables since they don't cause the app rerender. Instead we use special functions like useState() and useReducer(). useState takes an argument that serves as the starting value of the state variable and returns an array containing the STATE VARIABLE and the function to update that state. const [ stateVariable, setStateVariable ] = useState(0); - CONTROLLED COMPONENTS are form elements (such as ) whose value is controlled by the component's state. They use state values to have more predictable behaviour. Ex: function ControlledInput() { const [value, setValue] = useState('') return ( setValue(e.target.value)} /> ); }; 1) The user types on the input, setValue is called and sets what the user typed into state. 2) The state value is updated. 3) The input uses the updatded state as its value. Controlled components are a great pattern to use because if we want to change the component's behavior, we just need to change the state that controlls it. - HOOKS are functions that allow you to use state and other React features in function components. useState is an example of a React hook. There are 5 main types of hooks: 1) STATE HOOKS (useState() and useReducer()) - help managing state within components. 2) CONTEXT HOOKS (useContext()) - lets you use data passed through context. 3) REF HOOKS (useRef()) - lets you refernce things like HTML elements. 4) EFFECT HOOKS (useEffect()) - lets you connect to external systems like APIs. 5) PERFORMANCE HOOKS (useMemo() and useCallback()) - improves performance by preventing unnecessary work. useState(), useEffect() and useRef() are the 3 main hooks. - PURITY is a term used to describe how components should work. In a pure component, the same input always returns the same output. To keep a component pure, it should only return JSX and not change any objects or variables that existed before rendering. Example of an impure component: let count = 0 function Cup() { count = count + 1 (*changed variable outside component*) return ( Cup {count} ); }; - STRIC MODE is used to prevent errors. It's a special component that tells us about mistakes as we develop a React app. It's usually wraped around the component: import('./Component') ); - ERROR BOUNDARIES are components that let you catch app breaking errors and show a fallback component to tell the user what happened. This is useful because React apps are all Javascript and errors that happen during rendering can break the app. Ex: function App({ user }) { if (!user) { throw new Error("No user data") }; return {user.name}; }; This code will break the app when ran because it throws an error when there's no user. import { ErrorBoundary } from 'react-error-boundary' function Fallback({ error }) { return ( No user provided: {error.message} ); }; To prevent the app from crashing, we add an ErrorBoundary to display a Fallback component in App.jsx with a more helpful message to be displayed to the user.

[@theplotplayback]

We need more videos like this one

[@Applecitylightkiwi]

Very clean i use react for almost a year, if only you did this with nextjs aswell

[@B.C.Tech-003]

I love this video, It's straight forward

[@kforcate5654]

your explanation is already the cleanest i've ever read but i still lost focus at like 3mins😵

[@lorenzopollocaffe6277]

did an interview where they asked for an angular developer, repeated angular concepts, they instead asked me react and next js, i will not let them find me unprepared the next time

[@jay_wright_thats_right]

Who the hell thought about Arthur's fist when discussing 'strict mode.' Hilarious stuff! 🤣🤣

[@adalba.mp4]

Nice video, great work. Just my two cents: I think that a more accurate definition of useEffect is that it actually controls the collateral effects of the component through the dependency array. Connect to external systems like an API call for example isn’t a good practice, being a better option to put it on another layer using custom hooks to manage this kind of data

[@swifty8bit]

that is the best explanation of react's stuffs

[@jeffgathumbi3559]

glad to see y back.

[@cryptocurrencydailybugal]

@code.bootcamp make Vue concepts Plz ser thenks

[@bharatlondhe9995]

Concise and worth every second❤❤❤❤

[@PradeepMahato007]

Nicely explained, thank you for the cheatsheet !! 🙂

[@nthiwafelix7967]

Love the animation. Great work👍👍

[@donaldpetervicente8351]

this content explains well .. more vid to watch.. its refresh my knowledge on react and js again. 😁

[@reninmohan2303]

Now I can write react as skill in my resume

[@iancarr3923]

Excellent - especially for the older geezer!

[@tamis5908]

Absolutely FABULOUSLY clean and understandable explanation - KUDOS! Please provide a link to your Bootcamp site in your vid description details above!!🙌🙏🙏🙏

[@prasad_vlog]

hey buddy, thanks for such valuable video... 🙃