I work professionally with React for more than 5 years and still regularly fall into these traps. Understanding these concepts is essential, and this video explains them perfectly. If UA-cam would allow, I would like this video 10 times!
I've realy never seen any one who explains React hooks so well and all it's possible uses as well as what mistakes to avoid, This kind of knowledge is really what we are missing as junior developers, And i realy appreciate the effort man Thanks !
All the juniors in my team know by heart the count and setTimeout example because it's a common interview question. But when you ask them to demo global state they gg. One guy just left the interview...
@@vapeurdepisse What? At the tech interview, 2 of the codepens we give candidates for junior positions are: 1. The useState and setTimeout question. Most people get it right. 2. A quick demo on how to share state acros a component tree. Most people give up or just give bad solutions to this. You don't have to get all code pens right to get hired...
Great explainable video, thank you! Only a sneak peek about Axios. Since v0.22.0 we can use the AbortController passing the signal as an option rather than CancelToken as it is deprecated in new versions.
@@Isaac-eh6uu yes but to use react in a way that won’t burn a user’s computer you must use convoluted tricks for the hope that you render only 300 times
Every react developer on youtube create a value for us but there is some especially who totally change the way how to actually works in React You're the one of them Thanks and great. honestly, i don't know about your channel but i just on the recommendation of youtube. complete the 2 min i just realise oo my god what a man and his concepts
I'm so happy I clicked on this video. I'm a beginner in react currently working on a project and I was at the verge of giving up before watching this. Thank you so much this video saved me😂
Your method of explanations are second to none Lama Dev! Thank you so much… Suggestion for next tutorial… useReducer vs useState, I can’t seem to get enough explanations for them
Oh wow. This is by far the best guide on useEffect. I have been working with react for well over a year now still gotcha when it comes to useEffect. This enhanced my understanding. Thank you. Maybe another guide on other React hooks?
Hello from Roumania. My real job is Krya Yoga and I start coding 6 months ago,only as a hobby,I watch a lot of your videos and I like your easy way to explain.May Shiva(my Lord),bless you with long life and prosperity.Om namah Shivaya
I wish I had found this tutorial earlier. You have explained all the details of one of the most important hooks in a really intuitive manner ! Great work :)
Been learning react the past 5 months and never understand about the return option o the useEffect. And that is because all tutorials are about functional components, and we don’t see the componentUmount and didMount like the classes anymore. But this video opened my mind
Hate it when "junior" developers are generalized. Even some pretentious senior developers make those mistakes. The only difference is that those senior developers are good at selling themselves as better than the juniors. 😆. Great video, btw, it's just the title that I had to point out.
Hey Lama Dev, Awesome video. Could you do one on useCallback and how they relate with useEffect or just how to minimize alot of rerenders on your application
Friday's are for tutorials and Docs, combining these two helps you leverage on your coding skills. I fell in love with these useEffect best practices. Good video lad
Amazing video i rarely comment on videos but it was an amazing video. thank you for this effort I hope you can also explain the following topics also 1) Using a callback in the useeffect 2) The problem faced in forms when the state is one render behind the text entered in the input field.
It's better to use a primitive in useEffect's dependency array. I'm a React developer and I've made this mistake by adding bulky objects in the dependency array which in turn leads to huge performance losses & really laggy UX. In my case, I had added an object I was receiving from an API which later I changed to only the status of the request.
For me i was adding whole response array but it was going in an infinite loop . Due to reducers. Hence jus added a state flag when new replies were coming n toggled it in useeffecr
This video is just a precious 22mins in my career growth, these kind of detailed information just increases my confidence and thankyou for you to for creating such a great content 🔥
Full video very informative. And useEffect in the api section is very much helpful. I was struggling with that finally that solved by you for me. Thanks man. Subscribed.
One more issue I often see new devs working on React do with useEffect: Many times some given state can be calculated from either props or other existing state in a useMemo or just simply as a variable, but most new developers turn to useState + useEffect to do these calculations as they perceive these values to be state (thus useState) that needs to be derived from other stuff (thus useEffect). This in itself works but is not optimal and in some cases may cause unpredictable states. As mentioned above, these can be solved by converting the useState+useEffect into useMemo and/or a simple IIFE.
You misspoke at 11:13 - the effect isn't called every render with an empty dependency list. Rather due to the hot module reloading (HMR) it remounts the component causing it to run the effect again. Rendering happens when you update state (either from props or internal state), remounts happen when the component is unmounted and mounted again from the outside, whether due to a condition and in this case, HMR. The cleanup function returned from useEffect handler is called when the component unmounts, or any of its dependencies change.
Thank you alot, the last point makes alot of sense to me.. i always wondering why my useEffect fetch data twice and was thinking it is bug in most projects i was leaving a TODO to make it not fetch twice, and now i know the reason
truly really well explained. i Never used clean up function in useEffects and was totally unawares About it consequences, from now on will definately use it. even how good advantages it provides in api calling and also in other's thing's, truly well learned from your video, strick mode why we should use, you explained very well.
I work professionally with React for more than 5 years and still regularly fall into these traps. Understanding these concepts is essential, and this video explains them perfectly. If UA-cam would allow, I would like this video 10 times!
Продолжай работать в том же духе с 0-ми познаниями в JS, это прекрасно
Weird because after 2 months I don't???
Really cool😊
@@vapeurdepisse Congratulations, you can pick up your trophy at the corner of who gives an F parkway and totally pointless flex avenue.
@@artmax1998 О здарова, американский ютуб знает толк
I've realy never seen any one who explains React hooks so well and all it's possible uses as well as what mistakes to avoid,
This kind of knowledge is really what we are missing as junior developers, And i realy appreciate the effort man Thanks !
Would you say that only juniors watch these types of videos?
All the juniors in my team know by heart the count and setTimeout example because it's a common interview question. But when you ask them to demo global state they gg. One guy just left the interview...
@@kynshra8960 ya that was a catch
@@ionitaa you interview people that are already on your team?
@@vapeurdepisse What? At the tech interview, 2 of the codepens we give candidates for junior positions are:
1. The useState and setTimeout question. Most people get it right.
2. A quick demo on how to share state acros a component tree. Most people give up or just give bad solutions to this.
You don't have to get all code pens right to get hired...
Great explainable video, thank you!
Only a sneak peek about Axios. Since v0.22.0 we can use the AbortController passing the signal as an option rather than CancelToken as it is deprecated in new versions.
Very good explanation. useEffect is always intimidating! Keep doing the intermediate level help videos!
What do you mean by intermediate isn't useEffect one of the basic react hooks?
@@Isaac-eh6uu yes but to use react in a way that won’t burn a user’s computer you must use convoluted tricks for the hope that you render only 300 times
@@Isaac-eh6uu I wouldnt call useEffect a basic hook. Its the hardest hook for people to understand.
@@Isaac-eh6uu I watched at least 5 tutorials about use effect , still cannot wrap my head around it. So, yes , I would
call it basic
wanted to say. " I wouldn't"
I'm so grateful I clicked on the video... Never new about that cancellation of request
Every react developer on youtube create a value for us but there is some especially who totally change the way how to actually works in React You're the one of them Thanks and great. honestly, i don't know about your channel but i just on the recommendation of youtube. complete the 2 min i just realise oo my god what a man and his concepts
excellent professional video, v good learning, eye opener, thanks
the most helpful video on useEffect !!! Well Done!!!👍👍👍👍
I really love your tutorial mate , keep going and i wish you best of luck ❤️ from Algeria 🇩🇿
Been working with react for a while now and you just demystified a lot
For the first time I understood useEffect clean up. As always lama dev simplified everything. Thank you so much
Top-notch presentation, with a clear explanation of the pitfalls when working with useEffect
Beautifully explained. This will be my go-to channel now.
I practice from the thumbnail before even watching the video, and it worked, bro you've save me. Thanks buddy much love. God bless you.
Most useful video I have watched about React.
Omg. You are the best man. Cleanest explanation ever. We need every hook tutorial from you.
I think this is the most effective explanation I've ever experienced!
This is by far the most helpful react video I've ever seen, cleared up a ton of questions I had about strict mode and effect hooks
your explanation on "subscribing to api" was very good, earlier i seen it in react docs and had no understanding what it meant, thanks
I can't thank you enough! God knows how many times I fetched data with useEffect in a wrong way.
It was a perfect description of the React hooks I have ever seen. Thank you so much!
I'm so happy I clicked on this video. I'm a beginner in react currently working on a project and I was at the verge of giving up before watching this. Thank you so much this video saved me😂
For an experienced Backend Developer with some basic Front End knowledge, this just covered most of what I need to know in React to start out.
Sir , you are great !!!!!!!
Please continue this series 🙏❣️
Köszönöm szépen, a megfelelő tudást kaptam, pont annyira kifejtve, amennyire szükséges és tisztázódott a fejemben sok misztikum.
One of the best explanations! Keep on doing!
Only one thing is that useEffect is not lifecycle method anymore, it is synchronization method.
Another much needed video ❤️
Fetch API vs separate folder for API calls( as we used in our Netflix project)
This was the best tutorial I ever found for useEffect, very thoroughly explained.
This one is actually a deep dive into understanding useEffect hook. Amazing video
Sir, You are one of my favorite pedagogue... I always wait for your video
Your method of explanations are second to none Lama Dev! Thank you so much…
Suggestion for next tutorial… useReducer vs useState, I can’t seem to get enough explanations for them
It's an amazing tutorial and I can find answers lots of questions the interviewer asked me regarding useEffect during interview
Oh wow. This is by far the best guide on useEffect. I have been working with react for well over a year now still gotcha when it comes to useEffect. This enhanced my understanding. Thank you.
Maybe another guide on other React hooks?
At beginning of video I saw it renders twice, I was confused. And you explains it well at end of video.
Finally someone who care about understanding the details specially from the documentation
I really appreciate the use cases examples
Hello from Roumania. My real job is Krya Yoga and I start coding 6 months ago,only as a hobby,I watch a lot of your videos and I like your easy way to explain.May Shiva(my Lord),bless you with long life and prosperity.Om namah Shivaya
Beautiful! Thank you! Especially thanks for showing me how to write the clean up function. As well as the api clean up.
Amazing explanation, really clean and usefull. thank you
I agree! 😉
I wish I had found this tutorial earlier. You have explained all the details of one of the most important hooks in a really intuitive manner ! Great work :)
thank you bro for valueable knowledge
I am junior react developer still learning from Udemy and this was quiet needed. Thanks
Superb video ,thank you
Dude, this is simply, the best video about useEffect that i have already seen in all of my life. Thank you so much!
This is probably the best useEffect explaination i've ever seen !
Lama Dev you are a god sent human being for web dev, can't thank you enough.
Been learning react the past 5 months and never understand about the return option o the useEffect. And that is because all tutorials are about functional components, and we don’t see the componentUmount and didMount like the classes anymore. But this video opened my mind
Thank you! Please add more videos for professional React code and best practices! Even if you charge, I am ready to pay!
Wow it's just focusses on some core topics of react library and u have just explained us in a best way possible....
Hate it when "junior" developers are generalized. Even some pretentious senior developers make those mistakes. The only difference is that those senior developers are good at selling themselves as better than the juniors. 😆. Great video, btw, it's just the title that I had to point out.
so many thing i learned it in 5 min...like abortcontroller ,cancel request,strictmode... thanx a lot..
For sure is the best explanation about UseEffect what I had seen. Congratz
Congrats from Brazil!
Best explanation about react performing !
Great Video 💯
This is my first time commenting on a UA-cam video because this video really deserves it 😊
Definitely going to watch other react videos.
I noticed and watched the video today, it was the great present for my birthday)) thanks a lot Lama dev
I want moreeee!! If this was for beginners I'm curious what I'd learn for advanced developers because I learnt so much from this!
Its really helpful, Appreciated
Very useful, I was searching for these frequently, and you have grouped it together in one video, thanks a lot!
It sounds very simple and clear...and I got it =)
Congrats 😉
this is GOLD!!!!!
THANK YOU !!!!
🙏. your video is probably the only one that has a very beautiful explanation of useEffect. Thank you
Please continue this kind of videos.
you are so amazing....I just never seen an explanation so clean and easy to follow...thank you and keep up the good work
Such a good explanation and example. I've never seen someone explain react hook that easily and it's use cases
I have never heard a better explanation.
Very clear, simple, many examples.
Immediately subscribed to the channel
The best guide for useEffect I’ve watched so far. Super helpful!
This video was so helpful to know how to use useEffect properly for the person who just started learning React like me!! Thanks man
*please continue this type of videos*
as expected ur work is great man. we r waiting for useRef , useMemo in more detail
I think this is the best video explaining useEffect hook, you're awesome!
a very important subject, thank you. I failed a job interview because I didn't cancel the API request
Hey Lama Dev, Awesome video. Could you do one on useCallback and how they relate with useEffect or just how to minimize alot of rerenders on your application
This has answered many questions I had about this particular hook. Thanks so much for the great content!
This one of the best usseEffect explanations I've seen. Thank you Lama Dev 🙏🏻
Friday's are for tutorials and Docs, combining these two helps you leverage on your coding skills. I fell in love with these useEffect best practices. Good video lad
I love videos talking about the common mistakes we fall into.
Amazing video i rarely comment on videos but it was an amazing video. thank you for this effort
I hope you can also explain the following topics also
1) Using a callback in the useeffect
2) The problem faced in forms when the state is one render behind the text entered in the input field.
It's better to use a primitive in useEffect's dependency array. I'm a React developer and I've made this mistake by adding bulky objects in the dependency array which in turn leads to huge performance losses & really laggy UX. In my case, I had added an object I was receiving from an API which later I changed to only the status of the request.
For me i was adding whole response array but it was going in an infinite loop . Due to reducers.
Hence jus added a state flag when new replies were coming n toggled it in useeffecr
Sometimes, the whole point of component is to render complex data structure coming from backend, so "just always use primitives" ain't good advice imo
@@qbek_san4:39
This is so informative, as a beginner I do respect what you done in this instruction!!🎉
This video is just a precious 22mins in my career growth, these kind of detailed information just increases my confidence and thankyou for you to for creating such a great content 🔥
Thank you so much bro, this video very very very helpful
I agree! 😉
Após 1 ano de estudo só agora entendi com o não ter problemas com useEffect. O clean-up ajudou de mais
Vlw @Lama Dev
this is so far the best react tutorial. Kudos
Love you, man! Forte abraço do Brasil!!!
God bless you!
Best useEffect tutorial ever 👍
Full video very informative. And useEffect in the api section is very much helpful. I was struggling with that finally that solved by you for me. Thanks man. Subscribed.
This is some great quality contents. 👍🏻
So much clearer
Thanks sir please keep uploading these types of jr to sr developer videos
many thanks! you changed my development completely
One more issue I often see new devs working on React do with useEffect:
Many times some given state can be calculated from either props or other existing state in a useMemo or just simply as a variable, but most new developers turn to useState + useEffect to do these calculations as they perceive these values to be state (thus useState) that needs to be derived from other stuff (thus useEffect).
This in itself works but is not optimal and in some cases may cause unpredictable states. As mentioned above, these can be solved by converting the useState+useEffect into useMemo and/or a simple IIFE.
Could you give some examples please? Thanks!
Concrete example?
This is video is a life saver for anyone in productions keep it Lama :)
Wow! this content is so high quality. Definitely worth the time.
You explained really well, thanks for this refresher!
You misspoke at 11:13 - the effect isn't called every render with an empty dependency list. Rather due to the hot module reloading (HMR) it remounts the component causing it to run the effect again. Rendering happens when you update state (either from props or internal state), remounts happen when the component is unmounted and mounted again from the outside, whether due to a condition and in this case, HMR.
The cleanup function returned from useEffect handler is called when the component unmounts, or any of its dependencies change.
You're really the best. A good teacher indeed. Your videos are clearly explained and hands on practice. Thanks a bunch for all you do. Bless you!!!
Thank you for this masterpiece. Please Keep posting such topic that will take a beginner to intermediate
Nice tutorial! Thank you very much! As a beginner React dev it clarified a few things for me! Keep it up mate! :)
Thank you alot, the last point makes alot of sense to me.. i always wondering why my useEffect fetch data twice and was thinking it is bug in most projects i was leaving a TODO to make it not fetch twice, and now i know the reason
truly really well explained.
i Never used clean up function in useEffects and was totally unawares About it consequences, from now on will definately use it. even how good advantages it provides in api calling and also in other's thing's, truly well learned from your video, strick mode why we should use, you explained very well.