Tricky JavaScript interview questions and answers
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- Опубліковано 30 вер 2024
- Top 10 Trickiest weirdest JavaScript Interview Questions and their possible answers ( path to crack tough JS interview )
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This one is important for JS developers.
Thanks for watching ! :) Thanks for the support ! )
Very helpful, your you defeated the Google beast
"This is an INTERVIEW, not a RACE" -techsith ☝️
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'.
You are either wrong or you mean the opposite.
the below returns 4
function x(a,r,t){
return arguments.length;
}
console.log(x(5,5,6,7))
you can count formal parameters (aka "required arguments") with function.length, not arguments.length, which is a count of what's passed.
I was thinking the same thing, but also what's the point of no loops? How would a loop even help solve this problem lol.
output will be 4
x(.....) function will return how many arguments you are passing while calling x(....).
6:10
That's a cool trick to impress your co-workers,
If they dont know it 😂😂
There is no inappropriate content in this video, dear UA-cam
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;
Very interesting JavaScript question! Thank you for sharing!! Thank you for taking time and effort to make so many nice JavaScript videos!
This video is great but and your explanation is good.
I really did't understand the concept of asking these kind of questions in interview. Until and unless you faced these kind of scenarios in real time you never know the answer. I do have some decent experience like 6+ in JS but I faced these situations very rare when we work on framework. (9 out of 10 developers dont remember things after fixing an issue)
So if some one answered these kind of questions means they saw these videos(assume {some number} out of 10) or read somewhere. So what are you interviewing real time experience or some interview preparation ?
As an interviewer I will ask concepts(not these tongue twisters). architecture of application/framework and mainly approach on solving problem and wiling to learn.
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 :-)
Hi, Please elaborate as why arguments[0]() is causing this.length as 2. What makes arguments behave like that.
To print the length of arguments (17:33), we can simply write:
return arguments.length;
inside the function instead of using Slice method.
That is true Arjun. Slice helps to convert argument to an array and then you can use other array features like join() and things.
One of the best tutorial :)
Love those tricky questions, we actually keep learning :)
Great video, very useful
Very informative video . it's really help me. Thank You Sir
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 video is important video for ui developers. Very informative video infact.
I learned new things. Thank you clearing my Concept 😇
'Document.body.cotentEditable = "true" ' is super cool !!!
Yes first time i saw contentEditable I was blown away. :)
Please keep up the awesomeness.
Hi Thanks for video but I have a doubt
String({}) +String([]) will give me "[object Object]"
but {} + [] will results in 0
Can you tell me the reason behind this?
I've been watching your videos over the past few days and they've been extremely helpful and informative!
Thanks for watching Ninti! :)
Why don't you use a simplier way to figure out how many arguments the function has received?
let x = function () {
return arguments.length;
}
console.log(x(1,2,3,4,5))
Yes, that is the solution . I have a habit converting arguments object to an array . :)
Thanks for tricky question - didn't aware of this magic
Thanks for making this video which helps me understand tricky concepts of JavaScript. Thanks a bunch
Thanks! Great video!
Hope UA-cam will change its policy, keep it up please)
Thanks for the support ! )
I’m just here to tell youtube this video is important!!
Thanks for the comment buddy!
Getting ready for my first interview, your content is really helpful
Good luck with your interview. !
There is no inappropriate content in this video, dear UA-cam
my first javascript interview coming up very soon
Good luck!
There is nothing inappropriate in this video UA-cam. Grow up, this is really frustrating for the admin/owner of page as he is working so hard on content and good things.
Thanks for your support Rashid.
Very helpful input, many thanks
Awesome tutorials man.
Jake Kim
Hi
very good videos
Best Interview series!
Nice video I just feel awesome and think it about in different prospective so please update more more videos to learn more and moRe
Thanks for watching Nidhi :)
Great interview questions 👍🏻
Thanks for watching ! :)
Wonderful to learn this. Thank you
superb tricky questions. thank you so much and it is really appreciable.
You are most welcome
Nice video, keep up the good work! (:
Thanks for the support ! )
Very great Job. Tha k you so much
Thanks for making this video. Its a great help for guys like us.
Sufiyan, thanks for the comment.
I am following you since couple of months.. You are champ man. Keep it up.. 1000 likes from my side
Hi Subrat, thanks for watching! :)
really helpful for learning strange things about javascript.
Ishan, yes JS is strange and I find new strange things every single day.
your videos are awesome and UA-cam is very discouraging. Keep up the good work sir.
This video does not contain any inappropriate content and can be accessible to all ages..
Thanks Mihir
Good video. Posting comments so youtube can get off your back.
Thanks buddy!
you are great at teaching. very useful examples to understand js
Thank you Diksha, Keep on learning!
I liked even before video started
that thing at 3:50 must be the stupidest thing that javascript allows us to make.
Yes, among the other stupidest things that javaScript allows us to make :)
this video is important for JavaScript developers !!
Thanks for watching Sourav!
Thankful for good bunch of Interview questions ons JS.
Good video to understand JavaScript concepts in depth
Good educational video. 👍
Love yours videos tech sith
If my job interview clear I will donate on patron.
I appreciate the gesture Rushabh. Thank you for watching!
This video is important
I really like this video
1) "[object Array][object Array]" Failed
2) "hello" Success
3) You would need an extension Failed
4) undefined Failed
5) "1" Success
6) 0.30000000000000001 I checked it and in 64-bit the answer is correct
7) null Success
8) function(){ return arguments.length }
9) var A={
x:function(){
console.log("x");
return this;
},
y:function(){
console.log("y");
return this;
},
z:function(){
console.log("z");
return this;
},
}; Success
Techsith videos have been very useful to me. Thank you.
Very helpful videos
2 more easy way to get the numbers of arguments
const x = (...a) => a.length;
console.log(x(1, 2, 3, 4)); //4
let y = function (){return arguments.length };
console.log(y(1, 2, 3, 4, 5, 6, 7)); //7
I had a js interview question that asked which year a specific JavaScript feature had been introduced... You have to wonder who writes the test questions when you read one like that...
Hey "youtube" if you are listening "THIS VIDEO IS VERY VERY IMPORTANT FOR US DID YOU UNDERSTAND!".
Thanks for your work.
console.log(arguments.length);
vs
console.log([].slice.call(arguments).length);
Thanks for the interview questions in javascript
Could you please explain about 4 th question ("this.length") refer to arguments?
Hi,
For simplicity of typing I have used iife...
Why you have done like this ? any benefit?
(function x (a , b, c, d) {
return [].slice.call(arguments).length;
})(1, 2, 3, 4);
Instead of simply returning length of arguments array like-
(function y (a , b, c, d) {
return arguments.length;
})(1, 2, 3, 4);
Thanks,
Rahul
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 important video.
Thanks for making this video which helps me understand tricky concepts of JavaScript. Thanks a bunch
@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
Very well explained. Thanks Sith
Thanks for watching Jaffer.
function a() {
console.log(arguments.length);
}
Above will also work for arguments length.
Very interesting JavaScript question! Thank you for sharing!!
Hey Bro,
Your Sessions are great but kindly do update the answers based on current browser version i checked console.log({} + []) and i have received "[object Object]" because on typecasting the object we get Sting({}) --> "[object Object]"
arguments is ArrayLike, so .length is available without magic with array object and borrowing function. But most of questions quite interesting,
All the videos are career-boosting!!!
Glad you fee that way. Thanks for the support.
This is very helpful to understand JavaScript internal technical execution and it's improve my knowledge
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;
}
about function returns total number of arguments: Isn't it easier doing something like the following? Thanks!
let x = function(){
return arguments.length;
}
What's the point of converting the arguments object into a real array (17:01)? The arguments object has the length property. You could just have returned arguments.length
console.log({}+[])
gives [Object Object]...kindly explain.
function x(){return arguments.length;} this also works then is there are any specific reason to use [].slice.call(arguments).length ?
Thank you So much. It really helps.You are doing great :)
Its really a very good video. I liked it.
hello i was trying the first one consol.e.log({} + []); object + array that's are empty.Is the output an object is that correct? I am confused.
Most extreme trick questions on interviews, you never ever see use of such code in the real world of programming on the job.
Sometimes interviewers might use some nasty questions never ever used on the job, because they already have preference for another candidate instead, or politics (want to give the role to a mate or relative, internal sourcing company - forcing client dependency, so instead make it normal/easier for the other candidate they prefer), or worried about loosing their job to the candidate if the MD (non-coder) is also in on the interview, or just immature so they are testing the candidate against their own ego instead of actually interviewing the poor candidate properly.
In such cases, if the interviewer has bias for another candidate the questions will be realistic for the code they are actually working with.
Code is supposed to be easily readable for the team, if they coded like that on the job, they would get fired, they would be out of the game.
I know this post is many years ago :)
Great video about tricky javascript question. Thank you!!!!
helpful insightful javascript tips
Glad it was helpful!
Thanks a lot for this video, you are really unique with this content!
we can get the total number of argument simply using arguments.length right?
let x = function(){
return arguments.length;
}
console.log(x(1,2,3,4,5))
Getting Something new editable content and awesome tricky question. I seen your video regarding front end developer from where can i find the example or some document for this so I can keep in revise very quickly.
Thanks
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.
seriously very much needed video for developers
Thank you shweta for a nice comment! :)
Your all videos so far I have been seen are really deserves thumbs up ( 👍 ), Please keep doing your good work... and hope UA-cam should not harm you.
Hi could please make a video on PROTOTYPE and What is Prototyping?
u have gr8 knowledge on Javascript. I am learning a lot from u. I am looking forward for more technical videos from u.
It's fun learning these things about javascript..👌👌👌
In the problem about getting the total number of arguments, why can't we directly do return arguments.length, it will also return the total number of arguments passed to the function. Am I missing something here?
i hope you will have advanced wsl 2 tutorial..tnx..i like your tutorial, very informative
An easier solution for printing out length of arguments passed to a function is to just use const x = (...args) => console.log(args.length);
I have an interview as a junior developer soon and I cant answer any of these questions. Hopefully they will actually ask me something more useful or else I am absolutely fucked.