Learn useEffect In 13 Minutes
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- เผยแพร่เมื่อ 26 ก.ย. 2024
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In this video I cover everything you need to know about the useEffect hook. I compare this hook to the old way of doing things with lifecycle methods in class components so you can understand how to start using hooks effectively in your projects. This is part of a series of React videos where I cover all the important hooks in React.
📚 Materials/References:
useState Video: • Learn useState In 15 M...
useEffect Blog Article: blog.webdevsim...
React Hooks Playlist: • React Hooks
🧠 Concepts Covered:
- How to use hooks in React
- How to convert class lifecycle methods to function effects with useEffect
- How to use the useEffect hook
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#ReactJs #WDS #useEffect
You have the gift of breaking down any difficult topics in a way that everyone can understand.
I wish there was a super like button on TH-cam 👍
I thought so too, he can probably bundle this up and make it into an in-person bootcamp and charge 15k per head.
yes, he is that guy.
super like from here
I saw many videos on hooks before, but this one only makes me understand completely in detail and in first attempt only. Thank you so much.
The subscribe button.
I paid money for a full react course on udemy and after every hook I "learn" from there, I come to your channel to see it reexplained better. 😅
course by whom?
Me too! hahah!
Yes, me too..
Me too. lol
Lol me 2
One note at 5:00 for people newer to React. If you try to update state with setState (setResourceType in this case), but the value is the same as the current state, it won't trigger a rerender. This is because of the way the React team has chosen to implement useState (it helps to prevent unnecessary rerenders). This can become an issue when your state is an array (or an object), as you can mutate the array, try to update state, and it may not trigger a rerender because React thinks the array is the same (since the array reference is the same). You can solve this issue by using the spread operator (...) to create a truly new array or object: setState([...array]) or setState({...object}). More info on that at if you Google something like "usestate update not always triggering rerender component"
Thanks for this heads-up. It's something really useful to know
Correction: if you use _setState_ it will always re-render.
I found that out early on. There is this rule in React that "one simply doesn't mutate state" and it applies to hooks as well. React uses Object.is() to check for equality between the previous state and the new state, and if you mutate an array or object, it is still the same object and so it won't update.
@@prince5922 no
@@prince5922 No, it the value is same as before it won't re render. You need to spread
The fact that the clean-up code runs before the event listener is a key point that's rarely communicated in docs, tutorials, etc. Very well done!
Yes, I agree 100%! 😉
Can you explain Two things why App being rendered twice, when you click post twice, I mean when you clicked first time, I understand app being rendered, but when you clicked again on Post.
The app shouldn't get rendered as state is already same.
Second why useEffect ran twice, even though you are not using StrictMode
*Kindly help !!!!*
You are incredible! I'm self taught and employed as a full stack engineer, so I've been able to find some high quality tutorials on my journey. But you my friend, are truly an incredible teacher on intermediate/advanced language topics and I hope you continue to keep making these vids!
ditto man! hes a beast!!
I knew he was going to be good when he starred directly into my soul
This is the most understandable explanation I’ve ever found. Good job mate and thanks.
dude I wish I had met this channel sooner. You're amazing
I'm primarily a backend/infrastructure dev and have been struggling with some very basic React concepts. I watched your useState video first and you did a fantastic job breaking it down and simplifying it so that my smooth brain could understand it. You've done a fantastic job here too. Well done!
Man, I have the same issue, of course I'm just a student right not, but the useState was a killer video for me. With that video I understood a lot of react but this useEffect is mind blowing, really funny how a lot of people love React but it is kind of complex to get it when you advance to the second page which is like, man is this so freaking easy? hah
@@veoquenoesunproblema That is because people are learning ONLY React, which relays on JS, pretty much.
Good video, however this guy like almost ALL people try to assign the lifecycle to useEffect. But it is not pretty much the case because functional components behavior different from react classes, Dan explained in its blog ALL DETAILS.
Also this guy does not talk about Closures and why it is important to know them... (Course because people do not learn javascript but react)....
Kyle, every single time I feel that I don't understand something as good as I'd want, either it's html/css/js or react, I go and search a video on that subject from you. It's been a year and a half and it worked every single time. And I want to thank you for that! You're awesome.
Everything about you is cool , from hairstyle to voice to explanation
Learn from the enlightened
Wow, this is the best explanation I have ever seen so far. My respect.
This is the most understandable explanation I’ve ever seen
FINALLY!! After reviewing a ton of tutorials and explanations, I could finally understand what this hook was for! Thanks a lot!
was struggling all day with this thing, now its like crystal clear lol thank youuuu
wow. never seen state being used to fetch data dynamically like that with the press of one button! awesome!
I understand more in the last 30 minutes than I did 8 hours of lectures and workshops ago. Thank you so much!
Any time I watch your videos, you connect the dots for me. Thank you for everything.
You are a genius. The way you explain things and connect the dots is simply awesome. It is very easy to connect to what you explain and easily get accustomed to new technology . Great Going bro, keep it up :)
3 different YT videos taught me how to use the useEffect hook but I only learnt it when I saw your video.
every video of yours i search for because I am trying to understand a seemingly impossible concept, I leave 15 minutes later having a great understanding. 100% live up to your name, Web Dev Simplified
один из немногих на ютубе, кто реально понятно объясняет. god bless him
This guy is really awesome, talking too slowly but telling a lot of the topic for making it much easier, love u man 💚
I have to say this is the best explanation of react hook
One of the best tutorials ever
As usual, thank you so much for your explanations. By far the best resource for web development on TH-cam!
Thank you very much 🙏, It was a very clear explanation with sufficient but short examples.
you're a life saver and amazing teacher
Hey Kyle thank you for this new series.
I've been a rough time trying to study steadily while working from during this quarantine. This new series got me back on track. Waiting for the next episode!
What do you do now just curious 🧐
Finally I understood the concept...wow what a way of teaching man...! So simple and understandable. Thank you so much
I agree! 😉
@@lukas.webdevAt 10:00, how is useEffect called, even though the array is empty and having no change
This is the best explanation one can get on internet !!!! Simply wow . Thanks for the tutorial
Once again knocking it out of the ballpark
The name of the channel really speaks for itself. Thank you for this
You definitely have the teacher mindset. Really clear!
6 minutes of this video and i understand use Effect, something that i didnt understand in one hour lesson. Thank you very much 😊
that was really great. I feel like I understand ever slightly more
You are a Genius man! 💯👌and you really really know how to explain. Thank you man
I would like to know from those who disliked like exactly what did you not like. This is one of the best useffect exp out there.
He didn't explain the why it renders, bacause the state changed..and also print 2 renders so...one for the jsx other for the state change....and he should have also shown an example of setTimeOut in Useeffect
@@riyadzaigirdar5394 If you are trying to learn a hooks concept it's logical that you know basic react concepts like state change impact and setTimeout is a js concept, why learn react when one is not aware of js concepts.
Those are morons, dont think of them...they will have more "why's" in life then "yes"
You have a gift man, I really understand when I watch your videos!
close to nine months not understanding useEffect, thans for your help. It was the best one
Extremely Useful, I've just picked up react and these small doses of lectures are really making the difference.
Thanx, Kyle.
I always look forward to the intro tune, it's soothing.
So many times used useEffect but now i understand properly, respect for you sir.
I had better luck with you than my prof. Thanks a lot!
Wow thank you, bro, now I have a clear idea on useEffect
thanks for breaking this down so well, I finally understand what's going on!
The best REACT explanation on TH-cam. Thanks.
Hello, thank you for your precious efforts you put on every single video. I have a little question (it may sound silly since I'm a beginner): At the beginning of the video why "render" logs to console 2 times? Is it because state is updated twice (one by useState and another by useEffect? Thank you very much in advance for every replies.🎖🏆
I think it's because in development React uses strict mode and renders components twice. If you create a production build or remove the strict mode tags that wrap the main application things will render as expected.
@@eightyeightdays Correct. Great explanation! 😉
So clear... I was struggling with this concept, now it's ok, thank you very muck Kyle !
Thank you Kyle...... Your video is very helpful for the beginners like us!
I’ve now watched a couple of your videos for different react hooks and they’re great. Really clear and to the point. Thank you Kyle
Solved a massive pain in the ass 4 minutes, 6 seconds in. Best subscription I ever made here.
wow.. that clean up thing just blew my mind. I have been a react developer for a while now, still didn't know this. Well everyday we learn, we grow.
You are the reason I know React! Thank you!
i have no words which can appreciate your work.
honestly, along with this dope explanation, i recommend just reading the react docs, they are well explained and easy to digest.
Man you literally are a god to me! I learn more from you than at University!
This video makes useEffect so clear and I feel like I finally understand it now thanks to you!
Concise and Clear!!!
The best explanation, great job man
I agree! 😉
You're the best, I'm starting to learn React Native and I'm looking forward to have my questions answered by you!
one of the best explanations ever...loved it
I agree! 😉
man u are awesome the way u explain things in a simple manner really helps a lot for the people keep up doing the good stuff..
He isn't joking when he says his job is to simplified the web. Very easy to follow!
Best explnation I have come across for the react hooks !!
really good explanation man..u helped a lot thank u so much..
Hi Kyle I came here for a refresher ，since React 18, we unmount remount automacally，does it mean we no longer need this cleanup function mentioned in this video ？
Hello, My problem is that my View with Text renders before my random number generates in function. So nothing gets displayed in Text. What should I use to render random number first the Text?
Hi, I am a beginner of React and your videos are really helpful for me! Thank you a lot!
And I wonder if you would be willing to make the automatic captions on? That will be friendlier to the foreign audience like me🙇♂️ Thanks for your amazing videos again.
YOU ARE INCREDIBLY TALENTED ! MANY THANKS
Hey man, thanks for your amazing work. Have you ever considered streaming?
I've thought about it but really don't have the time to do so right now. I can barely squeeze in the videos I do make each week.
Thank you for this. Finally understood useEffect and useState
Very nice, brother... Thank you!
yo man hats off to you man you can break any complex topic into simple pieces love your vids man.
This is the best channel on youtube!
You are my go to channel when I need to learn
this helped me learn how i've been improperly using hooks. thanks!
amazing explanation in such a short video, thank you!
The best and clear explanation ever
You are awesome man! You explain things in a very simple and comprehensive manner, thank you :)
I just love the way you explain Very straight forward!
Fantastic tutorial as always!
I never comment but wow. You're like a gift to the internet, thank u, rlly
You are the best man. So quick and easy to understand when you teach it. Can't believe I've been putting off taking the time to learn hooks when all it would have taken was a 13 minutes with you👍🏼
Thanks dear.. it was nice learning from your tutorial
Really great explanation! Thank you!
Dude you explained is so easily, simply amazing man 🔥
Amazing video thanx Kyle actually going to start using hook now!
Hey bro great tutorial, really simple actually haha.
I felt a little awkward with you looing straight at the camera though LOL, but your hair is amazing, keep it going!
the dude stares straight into your soul lmaooo, great teacher thoo
Great explanation of something i always found very abstract, thanks!
DUDE The school I am with was trying to explain this and I was so LOST! I said screw this and came here and I understood everything by watching it ONCE!!! I spent hours on an assignment scratching my head like what the heck does any of this mean and why is the return the "clean up". NOW I KNOW.
I am promoting you from now on that $60 deal is seemingly the best deal I have seen in my mfing life. I'll be paying AS SOON AS I'm done with this course I'm in.
Simple clear explanation of the basic concepts. Very helpful. Thank you.
Great video man.
Much better explanation than my Udemy course... Thanks!
Great explanation. Thank you. I am your fan
Best explanation at the end of the video
This video is incredible, thank you for explain so easier topics that seem impossible to understand!!
This is most understandable I have ever seen.
best explanation on internet 👍👍
thnks Bro. u really simplifided coding...