Top 25 JavaScript Interview Questions for Beginners

[@swayampravodasgupta2956]

11:49 - There are a few other differences between var, let and const. 1. Var can be redeclared while let and const cannot be redeclared. 2. Both var and let can be declared without assigning a value while const needs to have a value assigned when you are declaring it. 3. Additionally during JS execution var is "hoisted" therefore all the var variables are first brought to the start of your code by JS and with an undefined value, before it executes your code. Let and const are not "hoisted" in the sense of the word but are instead stored in temporal dead zone (a memory allocated used to store such variables for the time between declaration and initialization).

[@kasireddylaxmi5609]

Yes you are correct

[@kasireddylaxmi5609]

21:37

[@avaneeshkumar9]

Sir Apki video ne meri bahut help ki. I've cleared SDE interview with help of this video. 14 feb ko joining hai ❤

[@cartoonkid5584]

owo, common kitna aia tha

[@hiviagrhri4814]

Kis company m sde interview tha ?

[@harshrohilla172]

refer krdo bhai

[@vivektiwari8667]

was a amazing video, But you left some important Question like:- Clouser, Lexic Scope, spread and Rest Operator, Destructring, First class function, Pure and impure Function, function currying, Map filter and reduce, call apply and bind, prototype chaining. Thanks a lot.

[@interviewhappy]

Great catch, that is slightly next level and I will cover then soon.

[@abilashinib7638]

Very good for my last-minute revision. Even beginners would find it simple to understand. Thank you very much. Sir, you have made me too happy.

[@interviewhappy]

You are most welcome @abilashinib

[@abilashinib7638]

I cracked it sir once again thank you so much 🎉

[@govindbansal2181]

Lots of respect for your hard work and great content. 🎉

[@zia-kayani]

sir sir sir .. thank you so much , love from pakistan..

[@interviewhappy]

Thanks and all the best for your career.

[@samiransari-fg6kx]

Your voice is very clean it's give me more interest to watch your videos.

[@mayurpatil1134]

Very best interview question for preparation.. thnx a lot😊

[@powercircuitacademy]

Sir i have completed this mini course for an interview . Thanks❤ sir

[@interviewhappy]

All the best @currentstudy

[@mahalingamsunthar7602]

Heartfull thanks for your all videos. In Javascript interview videos Top 25 JavaScript Interview Questions for Beginners In callback function question What are CallBack function? V IMP your example explanation function display(x,y,operation){ var result = operation (x,y) ; console.log(result); } display(3,9,add); Sorry for for your effort. I am try to add first line in your code example const add = (a,b) => a+b; I got result, Many many thanks for you. Now i am very very happy,

[@saisankar-q9i]

superb explaination sir i never have seen this type video ❣❣❣❣❣❣❣

[@interviewhappy]

Thanks. Glad you liked it. All the best for your career.

[@zia_muntasir25]

so much easy to perceive and happy to see simple explaination of the hard topics

[@interviewhappy]

Glad it helped! @self-taughtlearner6401

[@ashishvaidya7492]

Thank you Happy, this really helped me to quickly revise the concepts. Requesting the same video on React.

[@interviewhappy]

Glad it helped! React already uploaded

[@MunaSwamyC]

You are really great teacher. First time adding comments in youtube.

[@interviewhappy]

Wow, thank you! Hope I add value in your learning @munaswamyC

[@suchitachaudhary]

Amazing sir....pls bring 25 more questions of javascript...it will be really very helpful for us.

[@interviewhappy]

Thanks a lot and all the best

[@sumanthn.s.1377]

Fantastic video bruh, never seen such a simplified explanation on JS in KZbin.

[@interviewhappy]

Glad you liked it! @sumanthn.s.1377

[@vaishnaviwarang1583]

Amazing content! I am preparing for interviews and this is very helpful, so precisely explained. Would love to see part2 :) Thankyou in advance

[@interviewhappy]

Thanks Vaishnavi. I am working on part 2 :)

[@MrCoder-u9y]

​@@interviewhappythanks sir for this video, eagerly waiting for the 2nd part, also can u make one video for the react also!! 🙏🙏

[@dr.ayurbedic]

you really deserve 1M subscriber....from NEPAL

[@interviewhappy]

love you Dipesh. All the best for your career.

[@coolgirlsharu]

I have learnt many topics from this video 😊😊😊🎉🎉🎉, im very happy from this. I was not knowing many things from last 3 years clearly.

[@interviewhappy]

Glad to hear that. Thanks for appreciating my efforts . Good words means a lot @appusharu5657

[@yashwanth8350]

present mood : Happy happy happy 😼😺

[@_Sujit-khot_]

Same here ❤

[@N-Chance]

😂😂

[@ayushmaithani6548]

vic

[@tusharsharma2359]

Banana cat happi 😺

[@gamingwithnegi7575]

This comment is everywhere in happy s video

[@shailajagoud8292]

Kudos to your teaching skills sir👏👏👏

[@interviewhappy]

Thanks Shailaja. All the best for your career.

[@USMANALIANSARI-t3j]

45:48 I go through various video when I was learning c++, java(best in OOPS concept) and also JavaScript class was confusing for me but today you naild it and clear class concept, Thank you!

[@anish_rawat-i3m]

Thanks a lot dear sir this video is very helpful for beginners

[@interviewhappy]

wc and all the best buddy.

[@g-ytub]

You are so good to capture these interview questions.Your explanation skill is also extremely good. thanks for sharing

[@interviewhappy]

Glad it was helpful! @jitendra

[@basukunal89]

The content is really great with a nice explanation of each concept. It helped me a lot.

[@interviewhappy]

Glad to hear that . Thanks a lot @basukunal89

[@dadasoborge9011]

One of the best video on the internet...Thank you so much for this❤💥. Can you please make videos on the entire javascript course it will be so helpful for beginners.

[@interviewhappy]

I will try my best @dadasoborge9011

[@LearnerAbhi21]

This is THE BEST VIDEO I have watched on youtube considering explanations based on Theory as well as Practical !!❤❤

[@interviewhappy]

Glad you think so @beinglearner

[@Etcher]

Excellent video, thank you so much - really helped with my interview prep. I was rusty on the fundamental definitions but not any more, thanks again!

[@interviewhappy]

Glad it was helpful!

[@sudhamohanv272]

Good explanations, watched your old videos too. Gives motivation along with subject. Great job @happy.Thank you I am requesting please do on certification related, it’s importance, and where to get etc..

[@interviewhappy]

Sure I will brother . Trying to cover topics one by one @sudhamohanv 272

[@sudhamohanv272]

@@interviewhappy Thank you…

[@ArunKumar-jp3cq]

very nice video and way of under standing is excellent.

[@interviewhappy]

Thanks Arun. Glad you liked it. All the best for your career.

[@sathidontheboina8061]

Wow it's a very good explanation and easy to understand Thank you so much sir.....for creating this type of videos it is very helpful to many of the learners once aging thanks you sir

[@AleySoundz]

This video is amazing! Really helps to sum up what javascript involves.

[@areebahmed1773]

very nicely explained. Thank you

[@interviewhappy]

Thanks Ahmed. Glad you liked it. All the best for your career.

[@Zero_Bug_Zone]

This is a really really helpful video, there is no video on KZbin which covers mostly all concepts in a single video. Thanks a lot for this. Informative, Detailed and Great explanation with examples. Hats off🫡🫡

[@interviewhappy]

You're very welcome! Thanks for appreciating my efforts . @vikaskumar

[@Ramanujan-c5c]

Thanks a lot for creating Js Ivw Qs, got clarity in concepts. Explanations are easy to understand and ur presentation is cool. Love this Ivw Qs series. Tks for Empowering young coders and making world beautiful. Tc Team. Gr8 job.

[@rehmanshoaib8896]

Amazing sir I had search lot of videos but this video is really much helpful keep growing sir ❤❤❤

[@interviewhappy]

Thanks Rehman and all the best for your career.

[@Itsmepuneeths]

Most understood video i ever seen since fro i started learning JavaScript . You make me "Happy" by explaining like this. ❤

[@interviewhappy]

Glad you liked it! @puneeths7973

[@FroYouShorts-np5cm]

Guru kamaal kar diye aap to ❤🎉 Great ❤🎉

[@mitch1668]

So glad I found your channel. You explain everything so clearly!

[@interviewhappy]

I'm so glad!

[@gopssweety]

Amazing set of interview questions and answers!! You give us a positive vibe with your smile 😊

[@bryan_11016]

Thanks a lot sir! This was really helpful for me as I am preparing for my interviews. God bless and best wishes to you sir ❤

[@interviewhappy]

All the best

[@syedsuhel6164]

Tqsm sir i feel I know javascript after watching ur video. 🎉🎉

[@interviewhappy]

Great 👍Thanks and Welcome @syedsuhel6164

[@DK-hn9or]

Most valuable video for hour before an interview ❤

[@interviewhappy]

I am glad you liked it @Dk-hn9or

[@tr-dev92]

Happy I very much would love to have a coding session with you someday, this is your first video of yours that I watched and the value you provided is very much worth worth the watch, thank you

[@interviewhappy]

Welcome aboard!

[@cristiangolu1234]

Excellent job with these interview questions, also good luck with your KZbin channel, you're doing great content, keep it up! 🔥🔥🔥

[@interviewhappy]

Thanks so much!@cristiangolu1234

[@ShrutiSharma-zl8yy]

28:33 When callback function is defined and 10 and 5 value is passed along with callback function so how can output be 8.

[@Musicallymindsheal]

It Would be 15...

[@sujatha204]

Your explanation is next level 🎉

[@interviewhappy]

Thanks a lot 😊@sujatha204

[@abhijeetkamble9305]

Your videos are awesome sir please make a video on the JavaScript output series which is asked in the interview

[@interviewhappy]

Will try @ abhijeetkamble9305

[@pranshugupta227]

Thank you sir....amazing video and helpful too

[@interviewhappy]

Glad you liked it @pranshugupta227

[@dpmshooterspubg643]

great work and thank you for this one hour summary about js , i am waiting for ur up-coming videos...

[@interviewhappy]

Thanks and all the best for your career.

[@chandustrikes2017]

Thank you very much sirr.. Now i am cleared regarding basic fundamentals of js after listening this video.. It is useful for me.

[@interviewhappy]

Glad you liked it . @chandustrikes2017

[@roshankr6969]

Best Javascript question series ❤

[@hemensanmahilange4127]

Thank you so much sir for creating such an amazing Interview preparation. Today is my Interview and It gives me lots of motivation.💖💓

[@interviewhappy]

All the best my friend @hemensanmahilange

[@hemensanmahilange4127]

@@interviewhappy Thank you very much, sir.

[@lokeshvasnik6872]

Did you pass

[@hemensanmahilange4127]

@@lokeshvasnik6872 yes bro, interview was for internship. I was selected.

[@kranganath9764]

good sound and clearity

[@interviewhappy]

Thanks and all the best for your career.

[@shivashyt]

really I learned all the advanced concepts in this video. thanks a lot happy☺

[@Gyan_Tech_Soft]

Tomorrow is my Interview and this video is very helpful 😊 Thankyou Guru jii

[@interviewhappy]

Good Luck

[@Ram-bz4qu]

Thanks sir for your best wishes. I practiced your all questions. It helped me a lot in revising javascript concept 🙏🙏🙏. Your content was very useful.

[@atulsaini7013]

Thank you so much sir.This question are very very important for Interview 🎉🎉❤

[@interviewhappy]

Most welcome and Thanks for appreciating @atulsaini7013

[@MusicSpeaksVolumesChannel]

Bro, you are a fantastic teacher

[@interviewhappy]

Thanks bro and all the best for your career

[@gsaravanakumar932]

Its a great tutorial. Thanks

[@Royal-1992]

Excellet Sir, I am watching your videos continuly and i feeling very happy to you are sharing the great knowledge and your teaching method is awesome...🙏😊🙏 And we are very blessed because of you are in the youtube and udemy mediums...😊 I don't have the much words to you to express my gratitude..🙏

[@RealFunrr]

Thankyou Sir You increase my confidence of js

[@interviewhappy]

Welcome . All the best for your career.

[@pulyramesh1339]

Lots of respect for your hard work and great content. Thank you Brother

[@nadikakpathirana]

Very clear explained. Thank sir.

[@interviewhappy]

You are welcome @nadolaloshala8678

[@PeterChapman-py]

Thank you!! Haven't seen a collection such as this, very helpful!

[@interviewhappy]

Glad it was helpful!

[@gautamjuneja3726]

Sir because of you i got a job, such an amazing work you are doing.

[@interviewhappy]

It's my pleasure. Congratulations to my friend.

[@chayanjana20]

Introduction is awesome🎉🎉🎉🎉

[@Alkane051]

thank you so much sirr, God Bless You... sir , you are the best teacher of JS...

[@interviewhappy]

You are most welcome

[@dips3122]

Very good session. Very well covered js topics. Thank you for your efforts and making it available without any cost. I am referring to all your videos for preparation. Thank you😊

[@interviewhappy]

Thanks and welcome @dips

[@yawimalik498]

The most important difference between primitive and non - primitive data types is that Primitive Data Types are compared by value while non - primitive data types are compared by their reference.

[@shubhamdwivedi1259]

Such an amazing content, cleared my all concept.

[@interviewhappy]

Thanks Shubham and all the best for your career.

[@codewithdeepak45]

Amazing content! I am preparing for interviews and this is very helpfull, Thanks a lot sir

[@interviewhappy]

Glad it was helpful! @deepak

[@geetikarathore4787]

this video is very good and helpful for memorize the concept and make more videos on other topic of Javascript map reduce and await bind and the tricky question in which we face the problem

[@interviewhappy]

Thanks Geetika. And all the best for your career.

[@Jujitsubrasilian]

Omg you teach in best and perfect form . Thanks so much sir

[@interviewhappy]

Your Welcome bro

[@somu2067]

Salute sir g 😊😊😊😊😊

[@pranotideshmukh8974]

We would love to learn more in depth lectures of related technologies as well😊

[@lakshmisettisrinivas2187]

Hi sir, thank you so much for this class and we need one more session on javascript theory and coding. your classes are very helpful to understand the concept easily.

[@prasadmusini-w9x]

Big fan of your work sir

[@interviewhappy]

Thanks and all the best for your career.

[@AC-tj3xv]

The content is soo good and explanation as well, can you please upload advanced interview questions in JS and react as well

[@interviewhappy]

Yes sure will try to upload soon @AC-tj3xv

[@SelfMadeBillionaire-pp1vn]

This video is really helpful for quick revision of javaScript concepts for interview. Thanks sir for sharing this video.

[@interviewhappy]

You are most welcome

[@Raghuram3721]

Thanks for great knowledge. Your videos are very much useful. Very simple to understand with very clear code snippets.

[@devrajsinghchouhan4885]

Tq so much for giving this important concepts in js.😊

[@interviewhappy]

Thanks Dev. All the best for your career.

[@talankeshk7146]

Superb explanation 👍

[@interviewhappy]

Thanks and All the best.

[@johnnyjack2986]

soo much satisfaction after watching full lecture. Fully impressed.

[@interviewhappy]

Glad to hear that. Thanks for liking it @johnnyjack2986

[@hpWorldVlogs]

You are a very good teacher with simplicity of logics that you have shown here. Please keep it up. Great Job @Happy.

[@interviewhappy]

Thanks. Wish you all the best.

[@kunalkadam6539]

Sir Apki video ne meri bahut help ki

[@regiremiltan6074]

Really good session .its very help to my intern interview . like wise please post the some importance thing or interview questions about the other full stack technology such as React Node etc.

[@vvms6249]

There is an interview for me tomorrow. Hope this video Helps me...Good Work anyway!!

[@rounakmukherjee1009]

All the best bro

[@vvms6249]

@@rounakmukherjee1009 thak you very much ❤️❤️❤️

[@interviewhappy]

All the best bro. You will crack it.

[@MayurPatil-pj2qy]

hey bro, all the best & plz make sure to comment down questions from your interview, it will help viewers

[@vvms6249]

@@MayurPatil-pj2qy sure

[@harikrishnanpandyan5684]

We need like this essence of javascript videos... ❤❤❤

[@interviewhappy]

Will upload soon my friend @harikrishnanpandyan5684

[@vineetkumar2899]

Thanks happy for make me happy.I am your new subscriber

[@interviewhappy]

Thanks Vineet and all the best for your career.

[@brahmakumara-from-2023]

its really a wonderful .... i always believe in practical..

[@interviewhappy]

Sure, soon I will show the practical

[@saumyapandey7882]

Very good summarization of the important concepts Really helpful.

[@estefaninoelylopezguillen3808]

this video is awesome!! thank u so much

[@interviewhappy]

Thanks and all the best for your career.

[@knowledgeworld9799]

It's more helpful ur great ❤

[@interviewhappy]

Thanks and all the best for your career.

[@dajanjic]

Thank you sir, you're very good. Greetings from Serbia.

[@interviewhappy]

You are very welcome @ludakpzs

[@jaiswaltechnicalmentor1575]

Thanks, very useful for me

[@interviewhappy]

wc and all the best for your career.

[@anils1383]

Hi, Thank you for this awesome content, really very useful for interview, appreciate your efforts in putting this up. I have a question which was asked in one of the interview. Question: Guess the output? *********************************************** console.log('start') const fn = () => (new Promise((resolve, reject) => { console.log(1); resolve('success') })) console.log('middle') fn().then(res => { console.log(res) }) console.log('end') ************************************************* OUTPUT is as mentioned below ************************************************* start middle 1 end success ************************************************* Can you please explain the flow behind this. Thanks in advance Regards, Anil Sebastin

[@ramghodke8599]

this session is very much helpful, to clear deeply our concepts, thanks

[@interviewhappy]

You're most welcome@ramghodke8599

[@badarmughal2297]

Great video deserves a heart❤

[@interviewhappy]

Thanks and all the best for your career.

[@24sakshikohale94]

Sir your teaching method is very very good well done sir keep it up and please make videos on all languages like this