Learn useMemo In 15 Minutes - React Hooks Explained ( Frontend Interview Experience )

In this video I cover everything you need to know about the useMemo hook. I go over all the main use cases for useMemo as well .This is part of a Frontend Interview series of React videos where I cover all the important hooks in React. How we can use useMemo hook to memorize the output of a expensive function in our component that will help to optimize the performance of our component.
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#useMemo #ReactJs #TechnicalSuneja

[@TechnicalSuneja]

00:00 - Don't skip anything 🙏 Aur kya haal sabke? btao next topic JS kon sa hona chahiye ??

[@arijitroy5695]

BANDELOG JS THORA BOHOT KAR LETE HAI VAI. LEKIN DSA MAI SABKI FATHTI HAI. TRULY BATANA APIKI BHI FHATTI HAI KYA???

[@arijitroy5695]

AP JAVA SE KYU NHI EK COMPLETE DSA KA COURSE OR SERIES LAUNCH KARO. HAAM GARRIBO KA VALA HO JAYEGA. GOD WILL GIFTED YOU A VERY BEAUTIFULL WIFE WHO REALLY LOVES AND CARE YOU. BAS DSA SIKHA DO USING JAVA.

[@mdirshadaryan6354]

Routing and redux ke interview questions

[@ankittyagi1178]

useCallback

[@soumyaranjanbhoi7175]

Sir plzzz time complexcity pe video banaiye plzz

[@Ferozcyber]

Hello Bhai, based on your content n videos i got 170% Salary hike. Thank you so much for your guidance and I would highly recommend everyone to watch your videos on Salary Negotiation (specifically for Negotiation)❤️

[@abhisheksingh-uh9fc]

Thanks bhaiya i m lot of try understand usememo concept but apka video dhekaha to matlab , fantastic!

[@bantimarak78]

Your tutorial video is very helpful for the ppl like us. Thank you so much. Keep it up

[@nextleveltech267]

Thank you for the explanation.. really helpful..

[@anurag_gupta_agrlark]

Thanks sir for Teaching this from last 1 year I am learning this but I was not getting it logically you have made this to be memorable !

[@Shree79124]

jo example "alexa ko bhi nahi pata" waise type ka example diya hai guruji ne, Thanks ji

[@saurabrakshit405]

Aree fir se mazaaaaaaa aaa gaya..........Solid example with solid explaination .

[@nayanmongia2440]

finally useMemo aaya smjh you are god sir

[@A1996ARP2075]

Great request u to make video on interview experience including all questions n how u answered. It can help all

[@TechnicalSuneja]

Noted

[@soumyaranjanbhoi7175]

@@TechnicalSuneja sir plzz time complexcity pe video banaiye

[@MohammedHusainmobikira]

Thank you sir, great explaination. Alexa or bhi acha tha.

[@shubhampatil5935]

I think the actual purpose of useMemo() is different, instead of relating it to slowness. If during next renderings the dependencies don't change, then useMemo() doesn't invoke the function but returns the memoized value. But if dependencies change during re-rendering, then useMemo() invokes the function, memoizes the new value, and returns it. That's the essence of useMemo() hook.

[@codewithkaran8860]

and i think the actual purpose of use memo is to not polute with other function or event .

[@apoorvam3353]

that whats what every other hook does lke use effect but, he related it to slowness and explained that if gets delayed due to no dependecy change without delaying the rendering it will return the memoized value

[@uniquefinderfact282]

Sir bolti band kardi bilkul apne .naman hai apko kya Samjhta hein sir superb 🙏

[@souravghosh7047]

Amazing video 🔥🔥🔥🔥Thanks for clearing the concept bhaiya ❤️❤️

[@Pooja-jc9wq]

Bhaiya ur way of teaching is👏👏

[@saketsuman1282]

Sir, usecontext, usecallback hook pe v video bnao. Interview me bhot poochte hai ye topic.

[@monishtyagi2354]

@Technical Suneja bhaiyaa ek suggestion h ki code mai or comments add krke ek github repo mai update kr do ya alg se google doc mai daal kr link daal do description mai

[@arijitroy5695]

SIRJI AP GREAT HO.. SALUTE FROM ARIJIT. useMemo() TO CHALO ATA HAI AND WO KOI BARI BAAT NEHI HAI. LEKIN PROBLEM HAI KI DSA NEHI ATA HAI. APKA WO SERIES STOP HO GAYA HAI.. KUCH USKELIE KARTE TO ACHA HOTA. DSA MERA BOHOT WEAK HAI, JITNA MERA TECHNOLOGY STRONG HAI. SO DO SOMETHING BROTHER. REQUEST FROM ARIJIT.

[@anantjain9679]

same...

[@ayushyt918]

Thank you bhaiya bhut acha explanation diye Thank you I had a question in in react developer roles lifecycle methods aaj bhi use hori hain kya ? useMemo ka lifecycle method bhi pdhlena chaiye interview se pehle ?

[@BeIndian20]

Hlw bhaiya kya intership important role play krta hai apki first job ke liye or ya fir hamare projects inn sab ko pura kr dete hai

[@aniketroy03]

Thanks sir what an explanation!!!

[@hashimnoor4152]

well explained

[@sahej97]

Badiya example Ajay!

[@palashsardar1629]

Sir apka videos every day dekhta hoon. Sir ek task hai mera html table filter Using Javascript based on sort. Means sir ap jo search karenge o pahela row pe dikhaye ga or baki sabhi td uska niche rahega. Please help me.

[@kathikr9360]

Good class sir.Thank you

[@mohammedzaid30]

Hello Technical suneja Sir Your Videos help me a lot to prepare Js and Now i am Looking forward to watch this React js Interview series videos but i want to ask that is there only 4 videos in this series or more will come or this is enough topics to prepare..???

[@AmitKumar-mz2jg]

Arrange these in learning order of web development: 1.Html,css,javascript 2.Git github 3.React.js 4.Bootstrap 5.node.js,mongodb Is this the correct order and if there is anything more to learn?

[@roshanswag2551]

Html css Java script Bootstrap Then react

[@codewithkaran8860]

@@roshanswag2551 bro you are in a right path

[@abuxinegaming7600]

Tailwind CSS

[@AmitKumar-mz2jg]

Full stack developer/mern stack developer k liye pahle react.js seekhna chahie ya node.js

[@manojpawar2207]

React

[@abhidobhal8885]

Hello Sir, You are doing well.... keep doing ❤️. I have 2 offer letter and suppose if get another interview call then HR or Manager asked why you are looking more offer if you have already 2 OR 1 offer letter. What should be the accurate answer of this question?

[@pankajsoni7988]

awesome teaching skill

[@razzaqmohammedali4653]

Please make a video working with multiple developers in one project..... Full stack

[@atulsagotra5854]

Got the understanding but can you please explain why the isEven is being automatically called for counter two button click

[@abuxinegaming7600]

When any state changes in a react component. It re-renders the whole component. I think that's why isEven() function is getting called because counter2 is updating the state as well as whole component.

[@Scienceandfunfanclub]

Very well explained 👏

[@codewithkaran8860]

ekdm chokas video bhaiya 😂😂😂

[@shade3940]

Make more videos on questions sirji

[@anshumaan454]

Usecallback() pe video banana bhaiya

[@anshumaan454]

Usememo vs usecallback difference?? Pls make video on these with example

[@TechnicalSuneja]

I already explained in this video 🙂

[@ujjawalkapoor8342]

@@TechnicalSuneja but sir we can do same thing as well usecallback hook so which senerio we have to used useMemo and usecallback ?

[@arijitroy5695]

@@ujjawalkapoor8342 IT'S DEPEND ON WHAT TYPE PROBLEM YOU ARE SOLVING.. IS PROBLEM VALUE ORIENTED OR FUNCTION ORIENTED. . useCallback() IS GENERALLU USED FOR COMPONENT FUNCTION RENDERING.

[@ramkrushnaprabhu8027]

Hello, I want to ask one question... Can i use django in front end of web application?

[@shubhamdas6519]

Thanks for that sir

[@dikshaverma4772]

Hello, Sir I am 2018 passout graduate (Electronics and Communication Engg.). Sir I did some work in Python and Embedded field. Collaboratively I made many projects. I have some gap in work experience. and my last experience was in Embedded Python Development, but I want to be frontend developer and also made many projects using ReactJs. I tried to apply at many places but everywhere needs atleast 1+ years experience. Now I am jobless from past 3 months. Can you please suggest me what I can do now ?

[@codewithkaran8860]

bro what are you doing right now ?

[@palashsardar1629]

Google kiye Sir nahi mila. Only filter hoke 1 td araha hai. All td chahiye. Or search wala td frist Row pe dekhe ga.

[@kushagraahire1871]

Great Video

[@subhamoybhattacharjee6215]

lovely bro

[@jhs003]

please avoid "Welcome JI" instead of it You can use "Welcome Guys" ....By the way all your videos are very helpful

[@apoorvam3353]

y

[@palashsardar1629]

Thanks sir.

[@rohitbhatt7175]

macha rahe ho

[@tradesxnitinn]

Sir Angular Pr Full Course Le Aao Plzz Sir

[@arijitroy5695]

SIR KO ANGULAR NEHI ATA. REACT SE COMPROMISE KAR LE. EK HI TREE MAI KYA SAB FAL MILEGA. KYA GOD SAMAJH KE RAKHA HAI KYA??

[@tradesxnitinn]

@@arijitroy5695 tere Se Pucha Kisi Ne Kaam Kr Apna

[@arijitroy5695]

@@tradesxnitinn BILKUL APNA KAM KAR RAHA HUN. BROTHER OF AJAY.

[@Ferozcyber]

Hello Sir, I have a question, is there are any consequences if decline job appointment letter after accepting (if appointment letter mentioned specific class as " if I don't join on said date, need to pay damages and need to appear in court). Please clarify - Thanks

[@anuragtrivedi3210]

How can we get a job after bsc maths and knowledge with cerficate in phython can we apply for MNC

[@akashpani6645]

Bhai pls ans my this doubt......I am getting IT branch in a good private college (KIIT,odisha) should I take it or.....search for cse in some other college??? .....pls ans as my online counseling is going on !!

[@amolchopade7649]

mera oura page reload hone me time lag raha he.. uske upar kuchh kar sakte kya?

[@mdaatifofficial]

Hi bhaiya Mai abhi btech cse 1st year me hu to Cse me core subject kon kon se hai jispe focus karna chahiye please help me

[@ankitmungole1099]

What is difference between useMemo and useEffect, because useMemo is working same as useEffect

[@icanalsocode]

Because useEffect does not store the value for the input, so if you use useEffect you've to recalculate the value also for the same input. Also the purpose of these two are totally different. Like UseEffect is used for handling side effects in your component like making network request, and all. but on the other hand useMemo cache the value for the input. I've made a video on this , if you want you watch it

[@dipankargiri7612]

Hi sir, I have offer frontend developer in start-up. They say that 3year service agreement . I am fresher. So I confused about this . What I do ?? Please tell me sir😕

[@saurabrakshit405]

How to render dom using useMemo hook in react js ? can you explain please .

[@ankitchoudhary6327]

bhaiya aur videos banao please

[@innovativethings3341]

Brother I have a problem... Main as a software tester bnna chahta hu..muze use interest hai...lekin mere background b.com hai...kya koi company muze le sakhti hai...as a tester ???? Please brother help me...

[@icanalsocode]

try to get entry into startups and slowly make this as your carrier. Follow ladder strategy.

[@palashsardar1629]

Please sir now I am working as a fresher front end.

[@deepanshuvishwakarma468]

where to find all these codes ??

[@HarshShukla-c3c]

I couldn't able to find the link of memoization. Can anyone help ?

[@Himanshu-sq6zx]

Hii sir, I am in infosys. It's been one year I am in bench,no work assigned. I want to switch. Which backed framework should I learn in terms of salary and demand. I have learned java and know bacis of spring boot. Should I continue with spring or start with nodejs as it is in more demand.

[@vaibhav.v6403]

Then they used to provide salary to you?

[@codlover1468]

👍😎

[@smoothbrother5676]

🔥🔥🔥🔥🔥🔥

[@DeepakGupta-hj2dv]

Usecallback hook next video

[@TechnicalSuneja]

Noted

[@DeepakGupta-hj2dv]

Sir 1 week mai 2 ya 3 video post kro react interview series ki

[@rajusheoran4]

✌🏻✌🏻

[@mr_hassanali]

❤❤

[@avinaba_mazumdar]

why does the function gets called?

[@namanrajput7686]

agar useMemo hook result ko cache kr rha hai to first wale button k click pr state update slow kyu ho rha hai??

[@codewithbishal895]

computation toh hogana bhai

[@namanrajput7686]

@@codewithbishal895 nhi jab result he cache kr liya to fir dubara computation kyu hogi?

[@suvmatrix]

But why react is calling other functions?

[@yashchauhan5710]

why would u use react for websites ...its not meant for seo

[@mdnasiransari2039]

UseReducer hooks

[@anantjain9679]

but this problem can be done with useEffect hook

[@sumitmishra3864]

How the useMemo is different from useEffects as it also renders on the basis of dependency.

[@harrysaladfingers1515]

i think it adds up the functionality of caching the result.

[@codewithkaran8860]

@@harrysaladfingers1515 use memo store the value in cache and next time it will return the value from cache and we call it Memoization value

[@icanalsocode]

Because useEffect does not store the value for the input, so if you use useEffect you've to recalculate the value also for the same input. Also the purpose of these two are totally different. Like UseEffect is used for handling side effects in your component like making network request, and all. but on the other hand useMemo cache the value for the input. I've made a video on this , if you want you watch it

[@pradeepchalla789]

I think with useEffect also based on dependency value we can execute any function, so what is the difference between useMemo and useEffect

[@anantjain9679]

+1

[@nishantchaddha2953]

Useffect is called after the component render. But useMemo will be called before render.

[@icanalsocode]

Because useEffect does not store the value for the input, so if you use useEffect you've to recalculate the value also for the same input. Also the purpose of these two are totally different. Like UseEffect is used for handling side effects in your component like making network request, and all. but on the other hand useMemo cache the value for the input. I've made a video on this , if you want you watch it

[@icanalsocode]

Because useEffect does not store the value for the input, so if you use useEffect you've to recalculate the value also for the same input. Also the purpose of these two are totally different. Like UseEffect is used for handling side effects in your component like making network request, and all. but on the other hand useMemo cache the value for the input. I've made a video on this , if you want you watch it@@anantjain9679

[@RayanTanzeem]

Page isn't responding 😅

[@akankshaverma3284]

Can I get your github sources code.

[@nandanm2949]

Bro I need ur help

[@swapnilpatil2862]

What if I use useeffect instead of usememo and pass counterOne in dependency array? It will work in the same manner? @TechnicalSuneja

[@DkAg-z4u]

ap apna face thora chota rakhe right side me . code thik se dikh ni raha

[@rwinstech1018]

Apke Kam me Jo Vighna dal rha hai bar bar uspe usememo laga do

[@manpreetjord1885]

okay

[@petrsidorov7050]

Apreciando a una mujer tan hermosa. 2:7 sentadillas son unos PORNTINDER.Uno muchas y un buen ejercicio. 5:25 Se deja ver que hay muy buenos resultados 😍👍 Saludos desde la Cd.. de world losh mortales abian apreciado tan hermosa mujer