Top 100 JavaScript Interview Questions and Answers

[@ahmed_raaphat]

🇵🇸 TIMESTAMPS: 🇵🇸 02:14 what is Javascript? what is the role of JS engine? 05:00 What are Client side and Server side? 06:30 What is Scope in JS? 09:48 What is Hoisting in Javascript? 11:49 What is JSON? 13:18 What are variables? var vs let vs const. 16:50 What are data types in JS? 18:15 what is the difference between primitive and non-primitive data types? 22:23 what is the difference between null and undefined in JS? 25:12 what is the use of typeof operator? 26:28 what is type coercion in JS? 28:43 what is operator precedence? 29:37 Unary vs Binary vs Ternary operators. 31:10 What is short-circuit evaluation in JS? 34:22 Conditional Statement Types. 41:01 Double equals == vs === Triple equals 42:49 Spread operator and Rest operator in JS 47:00 what are arrays in JS? How to insert, remove, access, sort, reverse and manipulate array elements? 01:05:34 what is Array Destructing in JS? 01:07:12 what are array-like objects in JS? 01:10:05 How to convert an array-like object into an array? 01:12:05 what are loops? what are the types of loops in JS? 01:19:10 what is the difference between for and for..of loops in JS? 01:20:40 what is the difference between for..of and for..in loops in JS? 01:22:10 what is forEach loop? Compare it with the above methods. 01:27:03 what are Functions in JS? what are the types of functions? 01:38:27 what is the difference between arguments and parameters? 01:40:54 Default Parameters in functions in JS. 01:41:50 what is the use of event handling in JS? 01:44:30 what are First-Class functions in JS? 01:44:55 what are Pure and Impure functions in JS? 01:48:53 what is Function Currying in JS? 01:51:27 call() & apply() & bind() methods in JS? 01:54:22 what is a string? 01:54:43 Template Literals and String Interpolation 01:56:15 single quotes vs double quotes vs backticks 01:56:52 String Operations in JS 01:59:01 what is string immutability? 02:00:37 Different ways to concatenate strings in JS 02:02:20 what is DOM? what is the difference between HTML and DOM? 02:04:55 How do you select, modify, or remove DOM elements? 02:05:53 Selectors in JS DOM. 02:10:47 what are the methods to manipulate elements, properties and attributes of JS DOM? 02:11:26 what is the difference between innerHTML vs textContent? 02:12:50 How to add or remove properties of HTML elements from the DOM using JS? 02:13:59 How to add or remove style of HTML elements in the DOM using JS? 02:14:55 How to create new elements in DOM using JS? 02:18:21 Error Handling in JS 02:22:56 what is Error Propagation in JS? 02:23:35 Error Handling Best Practices 02:24:37 what are the different types of error in JS? 02:26:25 what are objects in JS? 02:30:05 what is the difference between an array and an object? 02:31:00 How to manipulate Objects in JS? 02:31:37 Dot Notation vs Bracket Notation 02:33:00 How to iterate through Objects in JS? 02:34:34 How to check if a property exists or not? 02:36:00 How to clone an object? 02:40:33 Sets in JS 2:42:59 Map Object in JS 2:45:40 Events in JS 2:50:47 Event Delegation in JS 2:52:50 Event Bubbling and Event Capturing in JS 2:57:20 event.preventDefault() method in JS 2:58:28 The use of "this" keyword in the context of event handling in JS 2:59:00 How to remove (unattach) an event handler from an element in JS

[@shubhamdas7347]

very gratefull for the effort.

[@divyadharshini6916]

Thank you 🙏

[@rubeenaanwar236]

thank u..

[@MdShihabUddin-dh5vc]

Thanks

[@js_offc8436]

Thank you man, great job

[@SSRathore21]

This is not just a interview question video , but the whole documentation of JavaScript in compressed form ,and really far better than those coding tutorials of 10 to 15 hours. Animations, presentation and using code examples and no garbage talking, point to point things make it seems like a paid course. You can jump to Node js or React after watching this easily Thanks a lot Sir

[@interviewhappy]

woww... tears in my eyes. They always said, make videos like other teachers where you type the code. I always said, my goal is to explain the concepts clearly & within time. My code typing will not make viewers good coders. Code yourself to become good coders.

[@PookieThisSide-d9c]

​@@interviewhappyno u r on the right track u explain so well and the examples that u give r do useful and easy to understand any concept i request you to please make more js interview questions as I have to prepare for it and as a fresher it's quite difficult to prepare for interview as I m a self taught person

[@its_so_not_me9747]

Qq

[@orangefield2308]

@@interviewhappy awesome video! might help to have timeline splicers in this three hour video to see questions or segments, video buffering is taking long by the way, maybe have different Part numbers to split up

[@abc-ym4zs]

any good channel like this for backend bro please bro reply me

[@aniketshahane7448]

For my reference : 12:39 Chapter 2 : Variables & Datatypes 28:12 Chapter 3 : Operators & Conditions 46:16 Chapter 4 : Arrays 1:11:39 Chapter 5 : Loops 1:26:25 Chapter 6 : Functions 1:56:01 Chapter 7 : Strings 2:01:55 Chapter 8 : DOM 2:18:22 Chapter 9 : Error Handling 2:25:57 Chapter 10 : Objects 2:45:28 Chapter 11 : Events

[@ShashwatChourasia]

🎉

[@JollyKhare]

thanks bro

[@ekarthika7745]

Sir after three years i have a confident for attend the interview. I bought your 500 interview questions and prepare one week now I feel I'm expert in. Net

[@interviewhappy]

Great, that is my objective. All the best for your career.

[@mounikanimma189]

How to buy. I want to buy please share details

[@shivanip1096]

I also want to buy

[@akulavara2940]

​@@mounikanimma189 Check video description

[@PookieThisSide-d9c]

Can you share that please

[@harshthosar8600]

9:00 I have always had this question in my mind. No interviewer had asked me this, but I always had this doubt. Thank you, sir, for covering everything with such details.

[@HazimTulumovic]

I would explain the difference between a for loop and a while loop as follows: 1. For loop: We use a for loop when we know in advance how many times the loop will repeat (for exmpl: i

[@srikarravoori124]

I have completed one hour and will complete the remaining soon. Really its simple and easy to understand. The video is prepared with utmost care interms of presentation. For the interview candidates , its one stop to cover all js questions.Thank you.

[@interviewhappy]

Thanks for appreciating my efforts. @srikarravoori

[@user-py1gn4kq5v]

I got job in multiple companies , thank you somuch sir

[@X_y_zaid]

Experienced or fresher?

[@vishnukumar-o5y8y]

In which company you got placed can you share details

[@user-py1gn4kq5v]

​@user-nz8sy4dq8y Infosys , TCS, Accenture

[@arijitroy8390]

He is bluffing

[@writer_shubh]

this is the best JS interview questions tutorial I've ever seen. Just purchased the PDF version of the notes as well, and that is helping more while understanding a particular topic. Much thanks! 🙂 UPDATE: I cleared Accenture interview after learning JS from this video.

[@PookieThisSide-d9c]

@writer_shubh great to hear ☺️ that can u please connect with me as I really need help coz I have to prepare for interview

[@writer_shubh]

@@PookieThisSide-d9c yes sure

[@PookieThisSide-d9c]

@writer_shubh heyyy can we connect

[@narendra2058]

​@@PookieThisSide-d9chi

[@narendra2058]

How is pdf bro

[@deepakprajapati9716]

app kitna simplyfy krke concepts smjate ho ajj tak esa video ni dekha youtube par you are osm teacher prnam guruji dhanyvad for this

[@interviewhappy]

thank you so much @deepak

[@MANAUWARALAM-te7fb]

Completed in two days. Awesome content is given by giving such a nice explaination. Seems like revising whole js. Very good and usefull video.

[@interviewhappy]

Thanks a ton

[@charan3998]

Thanks a lot sir I cracked multiple interviews even got 300% hike and working now after a gap of 7 months. Will always be greatful to you and several other KZbin creators for this.🫡

[@tanishajaiswal7559]

can you please refer me. I have 1 year of experience working as a NodeJS developer

[@nidhikumari5164]

Best series for JavaScript interview preparation ❤ MUST WATCH

[@engineersINnight]

Hello Happy Ji. Your interviews Questions are more helped me to get 2 Offers Letters with Salary Hike. Please keep it on. These videos will help more persons like me. also Please create a 100 FAQs on jQueries too.

[@VengateshK_7]

Really one of the best video I've ever seen for the javascript... Clear and quality explanation... It gives more confident for me... Thank you... 💚

[@interviewhappy]

Thanks for the kind words!

[@kalyanbellamkonda8653]

Sir very good session great sir thank you Love from Andhrapradesh

[@vidhyanadarajan7873]

very good start Sir, we can master JS by practicing your interview questions. i found few errors, one of them is at 1:30:15. function declaration, at console.log you have mentioned add instead of sum. so there is error to print the output. but its not major issue. your interview questions built confidence to attend interviews and knowing JS very important. im practicing every day little by little sir thanks. i want t buy the pdf but im from spain dont have choice to buy. plase give us an option to buy sir thank you.

[@Melakusisay]

words fail me to tell you how you are the best , you did the best interview questions which touches almost all aspect of JS chapters. your voice tone is welcoming and interesting I was happy even the previous 25 question and extremely happy on this 100 additional best interview question and detail explanation. Keep up your work, you are the best ever.

[@interviewhappy]

Thanks captain America. You touched me. People getting jobs and these kind of words are my motivation. I will try my best and everyone else also please do.

[@Melakusisay]

I bought the Udemy resource package, it is very usefull and valuable fair price, you deserve more than this prise !!!

[@UsmanKhalid]

Watching your video for the first time. Believe me, it is one of the best tutorial available for me. Even paid courses are not that much clear. You got your self a new subscriber. Respect from Pakistan.

[@azer9617]

Bro it's nice to live in the same world with people like you

[@interviewhappy]

Thanks great compliment @azer9617

[@athirasekhar2033]

I cracked multiple technical rounds of 5 companies in last 2 months watching your videos. Got Job offer too.Thank you!

[@bhawnasuman9363]

Hi can you tell me some ques

[@vikiboi8129]

Can you explain about the preparation and resources you took to achieve that progress.

[@user-py1gn4kq5v]

Same i also got

[@bhawnasuman9363]

@@user-py1gn4kq5v can you tell your interview exp

[@balendrasinghparihar8849]

Can you help me

[@HarshavardhanaB-b2f]

Hi Happy, Just completed all questions and made a notes, preparing for interview. Thanks for your free Video tutorial.

[@interviewhappy]

Just post a comment whenever you crack the interviews. That's my motivation.

[@fazilhakkim1091]

one of the great video I have seen ..thanks for your teaching

[@Gameflix548]

thanks a lot , i cracked multiple angular interviews due to this . changed my life.

[@MdMeraj-kq2he]

bro r u experience candidate or fresher

[@sumannayak7677]

how many years exp u have?

[@Gameflix548]

3 yrs@@sumannayak7677

[@joshuakemougne6471]

Sir i just love the graphical representations infact am 100% confident in js now. you just so explain it even my grandmom will understand if she were still alive arigato🙏

[@interviewhappy]

You made my day man. Best compliment. All the best for your career from bottom of my heart.

[@narinderkmaurya]

You saved my life before the interview, thankyou so much!!!!!!!

[@interviewhappy]

Your Welcome

[@lifewithomar05]

Todya I joined in a IT farm as a MERN Stack developer. Your videos are really help me to get the job.

[@RohitSingh-pl5wi]

Bro which company?

[@tanishajaiswal7559]

can you please refer me . i have 1 year of experience working as a NodeJS developer

[@mallikarjun266c]

hi Happy, Very interesting, even i was not aware few basic concepts, even I have experience. good to have revision. I have one doubt. at 20:41 as you mentioned when new value is assigned to same variable new memory is allocated. unnecessary memory is occupied old one right? are we manually clearing memory , once execution is done? what is the good practise to handle memory?

[@malarvizhit5803]

Thank you for teaching sir, it was a wonderful video and i feel confident.

[@divakarl9597]

Hi sir, I have seen your videos. I got a job in multiple companies. Thank you sir 😊. Your way of teaching simply super, Everyone must easily understand the code you are explaining line by line with examples. Watching your videos to learn new technologies easily from you sir.

[@interviewhappy]

Thanks and Congratulations. May this success open doors to new opportunities .

[@Rajveer-ow5gc]

Hi, I am from Jaipur and i cracked interview in two companies with help of your videos and currently i am working in one of them. thank you very much. you are providing the best resources for interview preparation

[@tanishajaiswal7559]

can you refer me I have 1 year of experience as a NodeJS developer

[@interviewhappy]

Great job sounds like an incredible opportunity and I know you're going to make the most of it. It would be nice if you could post your package and firm name to motivate others; but, if you prefer to keep it private, that is fine.

[@JackSadi]

Sir you are great teacher. All clear, simple and effective. ... I find this video after the struggle with different tutorials, videos, web3school, etc. ... Video done very informative, useful and really easy to understand. It feels how you like what you're doing. ...After 48 hours I have an interview for the FE position, I started to feel myself confident. Hope I will succeed. Thank you for your job and good luck for everyone who's really keeping to learn even after the numbers of rejections like me😂

[@interviewhappy]

Glad it helped you

[@dios8256]

This is pre interview gold thanks mate.

[@interviewhappy]

Glad you think so!

[@rajbhatia2784]

you are doing awesome jobs by helping communities, i have learned a lott from you, you are true inspiration... Thanks a lott for making such amaizing content..

[@interviewhappy]

Thanks Raj and all the best for your career.

[@samdisilvaashish311]

Content is 100% but explanation is little difficult to understand anyway Thanks man.

[@rahulsharma07891]

Thank you so much Happy Sir, I learnt a lot from this course, Got placed in two companies. Thank you

[@interviewhappy]

Excellent news

[@tusharutane8031]

Finally completed whole video feeling confident and thank you so much sir for this amazing video and the explanation was amazing.Best wishes for you

[@interviewhappy]

Thanks Tushar and all the best for your career.

[@CookieCache-q1w]

1:11:38 Why did we pass length parameter in the object/array-like object? Does the Array.from doesn't work without providing the length in this case ?

[@wowameer]

@Bro... You are really awesome. You also made things very easy to understand; your explanation and graphics are very informative. Good Job.

[@bernardus3289]

1:11:00 there might be a problem here as I get an error saying that the OBJ is not iterable but it does work with ((let objectArray = { 0: "a", 1: "b", 2: "c" }; console.log([...Object.values(objectArray)]); ))

[@vishalsutar9799]

Same here

[@kuldeepdawar7496]

Thanks for this video Brother, your explanation is very clear and wisely. You are helping a lot by this content thanks.. I am looking React videos like that explanation..🙂

[@LongNguyen-in1kk]

The video deserves way more views and likes. Super succint and comprehensive!

[@interviewhappy]

Glad you think so @LongNguyen-in1kk

[@sahil_karamkar0146]

I got more clarity in js tq sir. 👌👌🥳💯💯

[@ArshSingh-l1k]

I got selected, Thankyou @Interview Happy

[@interviewhappy]

Warmest congratulations on your achievement! I wish you even more success in the future.

[@adilwahla544]

I got offer & yes your videos helped me to crack interview MERN stack and Js + SQL So, thank you very much ❤

[@redonthebeatboi]

Hands down, the best javascript tutorial💌

[@Leen-Odeh287]

best JS interview questions tutorial, Thank You!

[@patilrahul515]

if you know basic javascript .. This video is very helpful to you for the interview and learning purpose .. You must crack interview after watching this video.. break in 3 parts and watch again and again..

[@abc-ym4zs]

Bro what about advance javascript sir

[@giorgimindiashvili3810]

tomorrow I have an interview thank u lot for that video, I'm on the 2:18:44 and this journey was amazing

[@bhaviljainnnnnnn]

Hello how it went ?

[@giorgimindiashvili3810]

@@bhaviljainnnnnnn it's missed I don't know why they don't give me correct hour, yesterday full day I was waiting for them... Anyway I'm ready for next interviews 😁

[@bhaviljainnnnnnn]

​@@giorgimindiashvili3810You are from ?

[@engineersINnight]

Very nice explanation. please continue. This is not only for interview but useful for Works also.

[@interviewhappy]

Thanks Abhay and all the best for your career.

[@beingcheercool]

lots of love to you sir! Big Thanks again for uploading such amazing content 😍

[@interviewhappy]

Thanks cool and all the best for your career.

[@lostgen36]

Thanks Sir. Feeling more confident about facing my upcoming interview after going through this video ♥️

[@MdMeraj-kq2he]

`bro r u fresher or experience

[@lostgen36]

@@MdMeraj-kq2he I have 2 years of experience

[@EternalBlaze10]

11:28 hoisting 12:30 json

[@akshaychavan5511]

Coming here for the second time. Indeed a great video.

[@diwakarisonyoutube]

23:40 Bwahahhaha I really like this uncomfortable long pause that shows the null data type.

[@Shivamishra16]

thanks a lot, this is one of the best video on KZbin for revise JS.

[@interviewhappy]

Glad you think so!

[@dilipkumarmattewada7163]

Good explanation covered all topics.. Please make one video for python - experienced

[@badalhalder2000]

Great tutorial for interview questions.thanks a lot dear..May allah help you and i am really pleased to your video and finally again I want to say you,,Thanks a lot

[@interviewhappy]

Many many thanks

[@varshakumaridube7507]

Thank you, sir. Because of your videos, I cleared an MNC company interview, and after watching your videos, I am very confident while giving interviews. Thank you so much.

[@PakizaJabeen-c9l]

in which country your company is situated?

[@interviewhappy]

A hearty congratulation on this amazing feat and may your future be filled with many such proud moments @ varshakumaridube7507

[@tonytony-fc6gq]

I watched the first 3 minutes , clicked on the UDEMY link and bought your course thank you

[@tbaxelgaming1594]

Can you send me that pdf bro plz

[@ravichandra183]

​@@tbaxelgaming1594 Can you share me please

[@sathirajusatyabhargavi1376]

Sir i just stumbled upon ur video for learning js basics.. Thanks alot sir ..i highly recommend my peers to go thru ur video ...

[@interviewhappy]

Thanks and welcome

[@sathirajusatyabhargavi1376]

@@interviewhappy sir do you have such video for cypress Api .i went thru all your videos list bt didnt get any ..did i miss it? Pls confirm

[@rohitpahuja]

Your calmness makes us more confident for interviews ❤

[@interviewhappy]

Thanks @rohit

[@MeetPatel-zl8ei]

Everything you covered sir except promises and async/await ❤

[@tijo_thomas]

I have interview tommorow. Thanks for the quick revision 💙

[@interviewhappy]

Good luck!!

[@esthersharon7608]

Woah! An amazing course. Got to know a lot. Thankyou sir!

[@interviewhappy]

Glad you liked it

[@sonasreedhar5867]

Thank you so much happy sir.this video is a very helpfull video

[@interviewhappy]

Thanks and all the best

[@SSRathore21]

Wow ! It doesn't matter hom much you code but you need such basic and minor details QNA to clear an interview. So ,it is must before an interview round. Thanks a lot Sir

[@interviewhappy]

Yes, you are right . Your welcome @rathore

[@TheRiderzx6r]

Best 3 hours I ve spent on youtube ! I have an technical interview and need to gather as much info as possible, watched also the 2 hour Angular questions and this 3 hours one about Javascript, very well explained and refreshing for the memory, I feel ready for the technical interview! Let s get it !

[@MdMeraj-kq2he]

bro are u fresher or experience candidate

[@TheRiderzx6r]

@@MdMeraj-kq2he experienced ish , 2 years

[@MdMeraj-kq2he]

@@TheRiderzx6r ok bro tq

[@yashshrivastava280]

did you clear or not ?

[@VijayKute-j1m]

Liked your react js interview questions video.. so here for Javascript knowledge rebrush

[@interviewhappy]

Glad it was helpful!

[@akshayshelar5151]

At 56.30 Timing , For concat method we can also modify the same array, right ? array = [1,2] array.push(3,4) console.log('Push method',array) array = array.concat(3,4) console.log('concat method', array)

[@mescalsour]

100 millions of thanks!

[@diegogarea]

very well explained, im in a middle of the video but i really liked, thanks a lot!!

[@interviewhappy]

Glad you liked it! @diegogarea

[@shriharikulkarni07]

Thanks for wonderful tutorial. Please split the video according to timeline (chapters) if possible. Helps the viewers

[@interviewhappy]

Noted

[@JackSadi]

2:56:20 confused between the Event Delegating and Capturing. Also not clear how Event Delegate works under the hood

[@milindsingh1264]

Well done for this super illustration of JS. Thank you for your hard work. Much Appreciated.

[@interviewhappy]

You're very welcome @milind

[@smartygaming9131]

Nice sir it's mostly all are the interview questions are covered,and as a fresher it's very very useful for me for the interview. Sir I support you and also make more videos on other technology like Node.js MySQL, Java etc.....keep it up....👍👍

[@DEEPAKSHARMA-lt6yc]

Short and Simple Explanation.

[@interviewhappy]

Glad you think so!

[@shesparks64]

Do it for react also pls and then separate for complete' frontend interview '

[@aman786nNadakuditi]

Nice tutorial ...... thank so much

[@giorgimindiashvili3810]

Happy I have another interview tomorrow and I'm here again enjoying your video and again thank you for that perfect video

[@interviewhappy]

Good luck!!

[@giorgimindiashvili3810]

@@interviewhappy I get a job as a frontend developer in big company, thank you so much again, god bless you you are very good person ♥️♥️♥️

[@johnadriandodge]

Shalom This is actually quite good, quite good indeed! Thank you very much for sharing.

[@interviewhappy]

Glad you enjoyed it@johndriandodge

[@legendarygaming8180]

nice explain with realtime example.

[@interviewhappy]

Glad you liked it @legendarygaming8180

[@Alysia.in.Wonderland]

Absolutely incredible information

[@interviewhappy]

Thanks

[@tarunrudakiya8546]

Good questions ,keep uploading such a informative videos of javascript.

[@interviewhappy]

I will try my best @tarun

[@madhavigaikwad8702]

Hello Sir Your JavaScript Interview QNA video help me alot to clear the interview. I got selected in Top MNC with 30+ Lpa Package As Tech Lead. Thanks So Much Sir🤟🤟🤟👏👏

[@unknownman1]

congrats buddy

[@ShubhamKumar-dc9tu]

i think this video help many student to get a job Great sir 🙏❤❤ Thanks

[@interviewhappy]

Hope so @shubham

[@pakoparde]

highly appreciable work👌

[@saifalisanadi6519]

Thanks for such amazing collection of interview questions, it's really helpful. I have a request, can you make single video by collecting all C# interview questions.. that would be great help. 😄

[@factcinemaaa]

I have completed 400 + question sir , so I want to say thank u so much .

[@interviewhappy]

Most welcome @factcinemaaa

[@RishiRaj-qq4vv]

Thank you sir a lot. Your top 100 JS and top 100 react questions helped me a lot to crack my interview. All the questions asked in the interview were from these two videos 🙏🙏🙇‍♂🙇‍♂

[@interviewhappy]

That's fantastic, good luck with your new job!

[@eramperwez187]

Very nice sir, please keep uploading and also make for typescript it's a humble request.

[@rajesh.geesala7565]

most underrated channel

[@vineethrathna]

i have a littele confsuion on differnce between primitive and non primitive data type question in that u said ,we assign a new value to the varible it stored in new location as of my knowldge In JavaScript, primitive data types (such as numbers, strings, and booleans) are indeed immutable. When you assign a new value to a variable holding a primitive type, the new value is stored in the same memory location. kindly expalin this sir which one is correct

[@seanishok04]

Thank you so much for your time. It help us lot😀

[@interviewhappy]

wc and All the best for your career.

[@gopipanguluri5663]

Awesome explanation, great work thanks for this video and udemy course 🙂

[@interviewhappy]

Glad it was helpful!

[@hellosunshine727]

Thank you! I needed this so much

[@chuabenjamin]

Thank you Sir, it is so strange, that the interview is construct like an examination but not actually test the skill to built a complete application

[@chuabenjamin]

For the forEach() method, is it assign a the arr2 that call the forEach() method into a variable, and console log the variable name, will have a better presentation of the forEach method does not creating a new Array? I try it and the output is undefined

[@chuabenjamin]

I comment for learning purpose, I am still new to JavaScript

[@interviewhappy]

Complete application can't be built in 30 mins :)

[@interviewhappy]

Ok, maybe something is missing. I wrote the outputs from console only.

[@chuabenjamin]

@@interviewhappysorry, I don’t have so much experience in interviewing. Maybe it is more senior position to test about the knowledge of design system, architecture, pseudocode to solve a specific problem, but everything built on the fundamentals, it is the most important

[@santhoshkumar-go6pg]

This is best video for learning the basics of JavaScript for interview as well as projects. can you upload MERN stack interview questions and answer ?

[@amanchaurasiya9677]

It was great video thank you for your hard work in helping us to get all the concepts at one place. But I think there's so many imp ques are not listed like Promises, Closures, Microtask and Macro task queues, event loop, etc. Can u pls make a same video on these concepts as well ?

[@interviewhappy]

Thanks Aman.. more questions are there in full course. All the best for you career.

[@harshjaiswal9926]

In JavaScript, when you declare a variable and assign it a primitive value, such as var a = 30;, the memory is allocated to store the value 30 in a specific location. Later, if you write a = 45;, it doesn't mean that a new memory location is allocated. Instead, the value at the existing memory location is updated to 45. But sir, you said different memory is allocated.sir,could you please verify your answer.

[@interviewhappy]

New location means, new memory address. That is immutability. Explore more.