Learn useState In 15 Minutes - React Hooks Explained 

How is it going, man? Have you found a job?

@@dangeorge3826 not yet, currently finishing up my portfolio now. Hope to have it done this week. But, I was able to help my friend who I met in this class to land a job. He had no prior coding knowledge. It's very possible. Super excited for him.

@@Brian-og6kk and how old is him?

@@dangeorge3826 he is 37

@@Brian-og6kk lol, congrats to him and good luck to you, man. I am 26, i am coding frontend for about 6 months and I am afraid that I will not get a job this year 😂

Sure.

148k people needs a 15min video for a 5 min documentation read?

look at the documentation on www.Reactjs.org and make same things

@@george527 How edgy shaming beginners for understanding something better from this video. So cool and edgy wow.

:))) imagine being called "edgy" for telling them that they can do it faster by reading. Im 100% sure no beginner was thinking: "This anonymous guy from RU-vid with a stupid Icon made me feel ashamed that I watch videos"

Who say's it's just some es6 magic syntax? I've never hear it from anyone here on RU-vid

@@emgodas My description of it being described as "just some es6 magic syntax" stemmed from the frustration of countless other tutorials going "just write this, you don't need to understand what this syntax means, just write it like this and it'll work" and not explaining it.

I came here to say this. He kept his poker face. Good job, Kyle!

Hey, who does not want to decrement a c*nt ?

As soon as I saw that, I minimized the video to scroll down and read the comments.

I decremented the screen to look for this comment as soon as I saw the typo..

it happened to me once in a CCNA course when I typed no shit instead of no shut in front of my professor...

Thank you! I actually wrote an entire blog article for this video first before recording to help make sure I has covered everything I needed to.

@Jimmy Kristian where is your second account which will confirm it worked?

@@WebDevSimplified sir I like your good keep going but please make vedio on all 10 react hooks

@@sulochanakharat9033 u dont need to write in broken english if u are to become a developer. Be smart!

ru-vid.comluwxDqy6NC0

Haha i bet his heart dropped after typing that by accident XD

Timestamp?

@@farhanaditya2647 5:57

I wonder why though. Function in JS is higher-order function, can be used as variable. Why here is different?

the double console.log happens with class components as well the reason is when u use create-react-app it by default uses strictmode which runs your code twice to debug it to remove go to index.js file and remove react.stricmode enclosing the app component

@@kiyotaka721 some new I learned, thanks.

Thanks! That will be coming for sure.

Yes! I am wondering the same thing!

Ah! I thought about it some more. When he destructured the useState hook and passed it the value 4, it was assigned as the current state and also passed to the setter function. I think that’s how it works

I think the second function that useState returns, such as setCount, setState etc. can take in a function and apply that function to the current value of the "state" (eg count) that it is bound with. So when saying prevCount => prevCount + 1 , you're just creating an anonymous function inline that takes an argument (prevCount) and increments it. The argument prevCount (or whatever else you rename it) is always passed in the current value of the state it is bound to in the useState call.. try renaming prevCount to xyz and reexecute

I had a hard time to understand this too. Still don't get it fully but I found that setState() is asynchronous and React may batch multiple setState() calls into a single update for performance(src: Reactjs.org). So, prevCount is just a function parameter received and it is the initial state on the first call. setcount(function(prevCount) { return prevCount - 1; }); Without using a function call inside setCount, you actually update the state directly, but with the function call you use a variable(function parameter) which is the returned value minus one and this value(variable) is used inside setCount() to set the state. I was experimenting with the following code and it give the same result. const [count, setCount] = useState(4); const x = count; function decrementCount() { setCount(function(x) { return x - 1; }); setCount(function(x) { return x - 1; }); }

Can u explain or refer to the concept on how this work ? Dont we have to call the function to run it ?

@@exodion4173 yes you do not have to call it .. when we pass a function to useState like this => useState(() => {}) .. you can see we are only passing a function to useState not calling it

Great. Can you elaborate?

Could i Ask for help regarding something in react?

4 is our initial state that we added 3 rows above by saying useState(4)... so our counter starts with an initial value of 4. Every time you increment or decrement the counter, this component gets re-rendered and prevCount just takes the current count value and increments or decrements it... I don't know if this answer was very helpful... but I just posted a video about the same topic, check it out and maybe this will help you to understand it... 😉

freudian slip

Hi Arjun! Are you a student or working currently? Would you be interested to explore job opportunities in web development?

@@shivanigaddagimath6105 No, thank you.