Tricky JavaScript interview questions and answers 

"This is an INTERVIEW, not a RACE" -techsith ☝️

For getting total number of arguments, in ES6 we can do let x = function (...args) { return args.length; } and for the method chaining we can use return this;

This question with "returning total number of arguments" can be solved in much simpler way. const x = function(){ return arguments.length; } The object 'arguments' has property ''length'.

Brother you are one of the most efficient teachers for teaching programming on youtube that i could find.You explain concepts really well.Its sad that youtube is doing this to constructive youtubers like you.You have all my support!

This one is important for JS developers.

5 years later and this video is still relevant. I didn’t watch it fully this time… but I do remember everything about it vividly. An absolute classic❤

To print the length of arguments (17:33), we can simply write: return arguments.length; inside the function instead of using Slice method.

RU-vid's algorithm is so stupid. Your videos are good quality and don't deserve to be demonitized.

This is great, I have a couple of job interviews next week for JavaScript roles and you have really helped me to build my confidence in preparation for this. Please keep posting videos :-)

I am following you since couple of months.. You are champ man. Keep it up.. 1000 likes from my side

I've been watching your videos over the past few days and they've been extremely helpful and informative!

6:10 That's a cool trick to impress your co-workers, If they dont know it 😂😂

Love those tricky questions, we actually keep learning :)

You helped me a lot in job interviews. Actually I am preparing for an interview right now with the help of your video. Thank you!

Very interesting JavaScript question! Thank you for sharing!! Thank you for taking time and effort to make so many nice JavaScript videos!

Your all videos so far I have been seen are really deserves thumbs up ( 👍 ), Please keep doing your good work... and hope RU-vid should not harm you.

Getting ready for my first interview, your content is really helpful

The reason you cited why the interviewer asks such weird questions are all very correct.

There is no inappropriate content in this video, dear RU-vid

@17.25, a more concise solution is: const x = (...rest) => rest.length; Awesome video, Techsith. I'm 100% subbed 🏆🎊. Most of these questions really had be thinking haha

I learned new things. Thank you clearing my Concept 😇

What a fantastic videos. I remember watching your one year ago it feel like nostalgia, because i spend hours and hours watching your videos, trying to understand things. For now, i did not find better one tutorials on JS stuff on youtube at least. Just fantastic.

Best Interview series!

Thanks for making this video which helps me understand tricky concepts of JavaScript. Thanks a bunch

Thanks for tricky question - didn't aware of this magic

This is one of the best channel to advance your JavaScript.

Please keep up the awesomeness.

@3:26 now I fully understand how styled components work. You are such a good teacher

Awesome tutorials man.

seriously very much needed video for developers

Thank you for helping strangers! I hope RU-vid does right by you and you can keep the videos coming. They're a great help.

my first javascript interview coming up very soon

Thanks for the video. We all support you for all the hard work you are doing!

Great interview questions 👍🏻

function a() { console.log(arguments.length); } Above will also work for arguments length.

Nice video, keep up the good work! (:

Amazing! The String constructor one was cool haha

Thanks! Great video! Hope RU-vid will change its policy, keep it up please)

question : function return total number of arguments. // do not use loops. let x = function(){ return [].slice.call(arguments).length; } Below one is more simple : let x = function(){ return arguments.length; }

Appreciate & yes maximum people make a list of questions to ask from the internet for the interviews & then start expecting the answers for those questions from candidates & in reality maximum interviewers also dont have any freaking idea for those answers. But current interviews have become a race, a questions/answers session, a Viva.

I'm finding all your interview videos helpful. I have my first ever on Monday and feel much more confident going in.

I did not know about the contenteditable attribute!! It's awesome

I’m just here to tell youtube this video is important!!

This video is important video for ui developers. Very informative video infact.

Thanks for making this video. Its a great help for guys like us.

Thank you. I have my interview tomorrow and if I pass it, it thanks to you.

Super helpful video while Im studying for a job interview

5 years later still a great content ✨

'Document.body.cotentEditable = "true" ' is super cool !!!

This is very helpful. I am conducting JavaScript interviews in the next couple weeks. This has been a great resource (along with your other videos).

your videos are awesome and RU-vid is very discouraging. Keep up the good work sir.

What a great video. I had my hand over my head all the way. Like I would literally fail all the questions without your solutions. Thank you so much.

The way you explain the JavaScript are really awesome.

this video is important for JavaScript developers !!

Nice tricky questions. These are proper genuine content videos.

Really helpful video! We need more of those on RU-vid!

Best RU-vid channel for JavaScript interview

you are great at teaching. very useful examples to understand js

I'm studying my interview with your videos. If I pass, I will edit my comment and I hope it's going to be well because the videos are very great. The contents are preparing the audience to the tricky and hard questions. Especially the ones that include mock interviews. Keep it going!

Grear video! Always putting out worthwhile content😁

Thank you so much for this. It's interesting to hear your perspective on these tricky questions and I appreciate your openness and honesty about youtube monetization

If my job interview clear I will donate on patron.

Excellent video!, I didn't knew about content editable property until now. Thanks!

really helpful for learning strange things about javascript.

Come on youtube this is an educational channel, please remove restrictions.

Very informative video . it's really help me. Thank You Sir

Thank you so much for this video! I hope this channel grows even larger!

Techsith videos have been very useful to me. Thank you.

Love yours videos tech sith

This is great man! Keep on going!

u have gr8 knowledge on Javascript. I am learning a lot from u. I am looking forward for more technical videos from u.

your videos are so important for any developer.

Very interesting JavaScript question! Thank you for sharing!!

Thanks for the great video, Techsith!

This is very helpful to understand JavaScript internal technical execution and it's improve my knowledge

Very well explained. Thanks Sith

Thank you for taking the time to teach us! Cheers

/ It is not possible to determine the total number of arguments without using any loops or iterative constructs. In order // to count the total number of arguments, you will need to use some form of loop to iterate over the arguments and increment // a counter for each one. // In JavaScript, you can access the arguments passed to a function using the arguments object, which is an array-like object that // contains the values of the arguments. You can use a for loop to iterate over the arguments object and count the number of arguments. Alternatively, you can use the Array.prototype.length property to get the number of elements in the arguments object.

All the videos are career-boosting!!!

An easier solution for printing out length of arguments passed to a function is to just use const x = (...args) => console.log(args.length);

Hi Sir, Your javascript interview part of videos are very helpful. actually I have found an another way in that question of function return total number arguments you have explained like function x(){ return [].slice.call(argunments).length; } x(1,2) // 2 length Found another way is arguments is a array like object it has number of array of arguments of function function x(){ return arguments.length; } x(1,2,3) // 3 simply we return arguments.length that will give lenght of arguments of function am getting answer for this way too.. Thanks once again sir.

Very nice and useful one. Techsith really helping the community...

Thanks for this video, and thanks youtube for not blocking it :-)

Thankful for good bunch of Interview questions ons JS.

Dude I love the videos you're really helping me and many others on our Dev path

youtube, don't block ads on this guys videos.

I am already subscribed to your channel and I get alerts but I wanted to let you know that I really appreciate your content thank you for making videos and posting them for us!

really appreciating the videos, thanks man.

I'm grateful for all the effort you are putting in which makes learning so much easier. Thanks for all the hardwork

Techsith is really good for JS developers

arguments is ArrayLike, so .length is available without magic with array object and borrowing function. But most of questions quite interesting,

By far the best channel for learners!

Thanks for this video, it helped me understand JS better

This is important for JS developer love it

Useful for everyone who prepare for interview process

Very helpful input, many thanks

Really like this tricky interview questions series. Keep posting it

This was a very informative video. Thank you for creating it! I'll be sharing this with some of my programmer friends :)

Thanks for your videos, they are always so helpful. Learned some great things from this one !!

techsith, your videos are amazing!