Javascript Interview Questions ( Promises ) - Polyfills, Callbacks, Async/await, Output Based, etc

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Javascript Interview Questions on Async Javascript including Promises, Callback, async/await etc will be discussed in this video including its in Polyfills, Output Based Questions, promise combinators, callback hell, etc.
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-------------------------------------------------------------------------
00:00:00 Intro
00:00:36 What is a Promise?
00:01:36 Synchronous vs Asynchronous Code
00:04:25 Asynchronous Code Examples
00:05:32 Callbacks
00:07:10 Callback Hell
00:09:56 Promises
00:13:48 Promise.resolve and Promise.reject
00:15:10 Rewriting callbacks with promises
00:18:03 Promise Chaining
00:20:08 Promise Combinators
00:20:57 Promise.all()
00:23:01 Promise.race()
00:24:01 Promise.allSettled()
00:24:43 Promise.any()
00:25:41 Async/Await
00:29:10 Get Interview Preparation call with me
00:29:43 Ques 1 - What's the Output?
00:31:38 Ques 2 - What's the Output?
00:33:19 Ques 3 - What's the Output?
00:34:36 Ques 4 - Promise Chaining Output
00:35:54 Ques 5 - Promise Chaining Output 2
00:38:05 Ques 6 - Promise Chaining Output 3
00:40:33 Ques 7 - Implement this Logic
00:42:30 Ques 8 - Rewrite using 'async/await'
00:43:59 Ques 9 - Solve Promise Recursively
00:46:49 Ques 10 - Promise Polyfill
00:59:55 Promise.resolve() and Promise.reject() Polyfill
01:00:54 Promise.all()
01:06:30 Promise.race, allSettled and any Polyfill
01:07:06 Get Interview Preparation call with me
-------------------------------------------------------------------------
Special Thanks to our members -
Srinivas Ayyagari

Опубликовано:

26 июн 2024

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Комментарии : 132

@RoadsideCoder Год назад

🔴 Get my Complete Frontend Interview Prep course - roadsidecoder.com/course-details ✨ Complete Javascript Interview Playlist - ru-vid.com/group/PLKhlp2qtUcSaCVJEt4ogEFs6I41pNnMU5 ➡ Book an Interview Preparation call with me ( 20% OFF for limited time ) - topmate.io/roadsidecoder If this video gets good response, I will make more JS videos, so do share it with others 🔥

@rajankhunt7002 Год назад

Please make video on promise polyfill and include all, race, allSettled, any. i hope you will make video on its all in one.

@saikatbishal8429 Год назад

Criminally underrated channel.

@sushantkhare8467 Год назад

This is just amazing. One of the best content for interview prep. The number of variations possible in JS is just endless. Thanks for helping us out

@dagogouranta5583 Год назад

this is just perfect, it really lets you wrestle with the concept until you get it! thanks RoadsideCoder

@sudhanshusharma9888 Год назад

When we learn anything from roadside coder we sure that we get quality content

@farhanakhtar8252 Год назад

Please make a video on Event loop! All the videos are really helpful! Keep up the good work!

@anandagar2k Год назад

Its very clear and easy to understand I have been waiting for the Own promise implementation Its very helpful Thanks.

@saichaitanyaemandi6386 Год назад

Truly amazing bro. Thank you so much . Such clean and easy explanation

@arunkaiser Год назад

I can give like for all videos from Roadside coder by closing my eyes because all are quality contents

@RoadsideCoder Год назад

❤️

@vishalheble Год назад

Pure gold content. Thanks for putting these hard efforts

@RoadsideCoder Год назад

And Thank you for supporting 🙏

@MythicEcho Год назад

The only video you need for asynchronous javascript, dhanyawad.

@srinivasak4087 8 месяцев назад

fabulous explanations , awsome!

@shanthikuruba2705 6 месяцев назад

These are the best interview questions and concepts.

@serajhassan545 Год назад

Haha.. Most excited 😍🔥

@akbarsheikh5690 11 месяцев назад

Your content is amazing 😊 loved it

@ghufranbutt7509 8 дней назад

Frm pakistan i have wathced lot of videos about asynchronus js but ur video is providing a Too much Unique and quality knowledge amazing video keep doing helping others Allah bless u more...

@RoadsideCoder 8 дней назад

Thanks, u can check the complete course here - roadsidecoder.com/course-details

@gonzalea35 6 месяцев назад

Hey man this is great, is very likely you will find a bunch of videos explaining these topics but this is by far the cleanest one I've found, great hour of my life was spent watching this, I just suscribed, I will see the rest of your videos for interview questions, thanks for your work.

@RoadsideCoder 6 месяцев назад

Thanks a lot man!

@todaysindia4114 9 дней назад

Just a wow..brother you are gem ..thanks for this video

@nitinshetty8187 Год назад

I've been following your videos, great content. Please do make a series on Software Design patterns it you be very helpful.

@user-og7de8ih4f Год назад

Haha.. that meme thumbnail 😂😂🔥🔥

@abhishekvishwakarma9045 Год назад

Awesome Series 💯

@user121304 Год назад

Thank you Piyush!! Your videos are helping me learn the basics of Javascript .

@RoadsideCoder Год назад

Glad to hear that

@Indialoves1 Год назад

You are amazing, Great Content.

@purusharma8192 Год назад

Meme Manager appreciating me for knowing everything about javascript Me who watches all of the videos of roadsidecoder

@RoadsideCoder Год назад

Hahah

@vi_shalkumar10 Месяц назад

Why to seee this lecture Lecture=quality Question=more practice(good) Explanation =clarity

@brijspy Год назад

Absolute quality content ❤️

@RoadsideCoder Год назад

🙏❤️

@shashidharvarne1059 2 месяца назад

Thank you so much!

@nanasarathi Год назад

Very informative 👍

@nikhildosapati8719 Год назад

Really amazed. I will definitely suggest your channel to beginners who want to understand or learn javascript. Thanks for making the javascript very easy for us😉

@RoadsideCoder Год назад

Thank you so much brother.

@anshul9714 Год назад

A very good video. Kindly consider omitting "over-here" from vocabulary. I do understand English might not be the first language. But one day at a time. Cheers xx

@LogicOpsLab Год назад

Loved the thumbnail. Gonna copy it someday!

@RoadsideCoder Год назад

Haha sure

@ankushladani496 Год назад

Thank You bhaiya....

@tt2318 9 месяцев назад

man you are good thx

@nileshnilu7902 Год назад

More content like this ☺☺

@matiasgarrido1004 Год назад

Excelente, as always

@RoadsideCoder Год назад

Thank you! Cheers!

@wellbalanced1212 11 дней назад

Thank you so much for these informative videos.

@RoadsideCoder 8 дней назад

Thanks, u can check the complete course here - roadsidecoder.com/course-details

@amaljeev Год назад

So perfect

@AjithKumarsham Год назад

Nice content, There's one minor error in myPromise implementation, you should update isCalled = true, instead called = true;

@jhaganb9215 Год назад

Can you make videos related to dsa using JavaScript for the dsa round in frontend interviews - also give some idea about how to get frontend internship opportunity while in college. hoping for your reply :)

@srikarravoori124 Год назад

superb!

@amruthavs2851 9 месяцев назад

Great learning, Thank you Please do a video on Classes in JS

@rajankhunt7002 Год назад

Please make video on promise polyfill and include all, race, allSettled, any. i hope you will make video on its all in one.

@sequoiakanies2202 5 месяцев назад

thank you

@ajaykumar-ho4wz 7 месяцев назад

i learn more things this js videos please make more videos...

@arunyadav7467 Год назад

I saw your channel content your channel have potential to reach 1M but be consistent please

@RoadsideCoder Год назад

Thank you. I'll try my best

@rajanmagar5173 Год назад

@RoadsideCoder I have great idea to make video upon and this will surely gain more people's interest. The idea is the implementation of Reactjs or Hooks in vanilla js. Thanks me later.😎

@ajithamin9196 Год назад

Thumbnail🔥🔥

@divinomunch Год назад

Thanks.

@divyasampath2843 Год назад

Just have a doubt at 42:29, when we can directly print string from promiseone by logging in the first .then itself, why are we first returning and then printing it separately? Cant we do something like this : promise2.then(res => { console.log(res) // which will print 'First!' })

@anandstephan6020 Год назад

i can give like of your video before the preload ads start

@ajaykumar-nx7kb Год назад

Very nice video. Please make a video on oops

@gauravdhenge6328 11 месяцев назад

hi ..thanks for this video nice efforts ..can you plz make a video on prototype and prototype chaining.

@shivambln 5 месяцев назад

Yes plz event loop Explain event loop in context of both javascript and nodejs

@bishwajeetpandey1570 Год назад

Please make a video on how promises handled with micro taskQueue

@nikhilmathewfrancis2831 10 месяцев назад

Hi bro, I was just working on a use case like getting the images w.r.t to the term the user inputs using react and am using the unsplash api for this and doing the api req using Axios. Now the problem is the api req fn is written in another file called api.js and the result is returned into a component. When returning the resultant its going infinitely when logging. I done this using promise. Can you help here bcoz am stuck here.

@aurrelko Год назад

That is one of the best explanations that I've seen so far on RU-vid, keep it up 🫡

@dhirajjaiswal2941 Год назад

great THumbnail

@BharathKumar-iq7ku Год назад

Thanks buddy.. Please make video on prototype

@RoadsideCoder Год назад

Definitely

@user-iw1pj9bb8x 4 месяца назад

bro, wo notion bhi share krdo saath saath. bdiya kaam hojayega

@Abdulmannan31111 Год назад

Please make a video on Event Loop as well. Your way of teaching is superb. Love from Pakistan 😍❤

@harshsinghchauhan869 Год назад

Thumbnail man 💪🏿😂

@PankajKumar-tu9nv Год назад

Sir, Please upload interview questions on event loop

@elik3765 Год назад

Amazing content and presentation skills. Thank you!!! only one question, what kind of Indian doesn't wobble his head?!

@bishwajeetpandey1570 Год назад

Please create polyfill for promises chaining also

@nitins5273 Год назад

Bro recently one interviewer ask me to create custom react router. Can u pls create a video and explain it.

@AnilKrishnaDesu 2 месяца назад

Can you explain promise and promise.all polyfills with more simpler way? It is very though to understand

@ramkrushnaprabhu8027 Год назад

Please make tutorial on caching

@ProGAMER-um6rm 4 месяца назад

Ram Ram bhai Amazing & outstanding Content I have ever seen online but source code kaha milenge ye sare

@adnantoufiq 10 месяцев назад

Hello bro. ❤️ I am from Bangladesh. I really like your all vedio based on js. Your explanation is too much good. Please make the more vedio on Reactjs interview question

@RoadsideCoder 10 месяцев назад

Definetly! Thanks ❤️

@vikasnarasimha9923 Год назад

Freshers also will be asked about polyfills? If yes then what kind of, the easier ones like map filter and reduce or tough ones like promise and it's combinators?

@RoadsideCoder Год назад

Anything can be asked

@arunyadav7467 Год назад

One suggestion be consistent

@shivamjha.56 Год назад

Next video on redux pls with a project (not counter app)

@amansaxena4446 Год назад

can you add these questions in a github repo?

@jhaganb9215 Год назад

Hi bro, love your content and the vibe of the video so wanna ask you a question that is is there a internship which is only for frontend developer and how can i apply for it. Looking for you reply

@Aptilover 8 месяцев назад

@jhaganb9215 hey did u get internship or job .. if yes then please do connect with me .. waiting for your answer

@jhaganb9215 7 месяцев назад

@@Aptilover no i did not get any internship specifically for frontend. i tried to get but could not even able find any opening for FE . every where it was freshers role only. try open source contribution for frontend project which will help to get FE fresher role even in smaller companies/startups

@ahmedaz6917 Год назад

I try find this Answer more 4 hours A web developer is creating a function to return a promise. Consider the following JavaScript promise function: function greeting() { return Promise.resolve("Welcome"); } How can the developer create an asynchronous function that returns a promise? return "Welcome"; } function greeting() { return "Welcome"; } function greeting() { return resolve("Welcome"); } await function greeting() { return "Welcome"; }

@yusufansari7618 Месяц назад

But while execution this will go in micro task or macro task queue as promise is a micro task please correct me if i am wrong somewhere 😅

@aakashjyoti8605 Год назад

whenever i start this video to practice after some time started to make my own implementations. is it me or its same for everyons

@parassingh9723 Год назад

Yes, please make it vedio on event loop.

@RoadsideCoder Год назад

Soon!

@jaganvichu 11 месяцев назад

@@RoadsideCoderdid you created

@saikumargatla4706 5 месяцев назад

Piyush polyfill of promise was very interesting. Can we expect a video on prototype and prototypal inheritance. Also I think there is a typing mistake at 54:57 it will be isCalled = true

@RoadsideCoder 5 месяцев назад

Thanks man, yes I am working on that video

@krunaljoshi7390 8 месяцев назад

Really content is so good, make some practice platform so that after, watching the video anyone can do some practice because without practice people forget everything. And also I need one urgent help if you are available currently I can't spend money but after some time I will give you money

@vishnusingh2300 6 месяцев назад

23:00

@princeallen8833 4 месяца назад

My Brain has left the Video on Polyfills part

@akash_gupta_2090 Год назад

in allSettled polyfill why u write Promise.all(mappedPromises); ????

@TopTalentBridge Год назад

bhai thoda arram se hum etne tej nahi ha tho thoda aur explain kar deya karo

@saimanikantaandey3302 9 месяцев назад

polyfills for promise asked for a fresher or experienced?

@RoadsideCoder 8 месяцев назад

yes

@jyothig3993 Год назад

Javascript is a single threaded .. But we run asynchronous code .. Can u explain this..

@FahadMasood Год назад

Javascript is single threaded so it will only execute one operation at a time. Asynchronous code runs only after all the synchronous code finish executing. I hope you're clear now

@miruthuladineshbabu7795 Год назад

Asynchronous functionality is achevied by using web API like set time out etc. These are not part of js

@govardhanreddygunnam6237 Год назад

wow... im 10 months late and still in quarantine

@devhandler2821 4 месяца назад

Why is the output of this "First" and not "Promise { 'FIRST' }" . const firstPromise = new Promise((res,rej)=>{ res("FIRST") }) const secondPromise = new Promise((res,rej)=>{ res(firstPromise); }) secondPromise.then((res)=>console.log(res));

@amitshimon8674 Год назад

Tis is not a valid promise implementation, in the specification states that a promise can be then multiple times, please check you implementation and you will see you can call then only once.

@mohammadajharuddeen8933 Год назад

Bhai Hindi me video banavo java script or react native ka

@himanshuranjan8657 6 месяцев назад

main chiz blurr ho gya sir

@samiullahsheikh5015 2 месяца назад

You are confusing Aynchronus with promise. Promise doesn't make a piece of code async.... It's just a way to track the async code. Moreover if something some object is thenable it doesn't means it's its returning or executing some asynchronous code. For example in nodejs Promisification is a common pattern where ur can promisify a fuction that receives a call back function. So by promisificaton are not make that function asynchronous

@md.asikulislam8569 9 месяцев назад

What's the actual reason for undefined ??? const changeAction = (chanelname) => { setTimeout(() => { return (`subscribe to ${chanelname}`); }, 1000); } console.log(changeAction(" Roadside Coder ")); console.log('Ending point ') console.dir(changeAction); Output starting point undefined -----------------------------------------------------------???? Ending point

@vinaypatil8009 Год назад

Sir 1 selfish request 1 Reactjs project with CSS (explain css also) 1 Reactjs project which is capable of showcase in resume to impress recruiter Please 🙏🏽🙏🏽🙏🏽 sir make 1 project

@RoadsideCoder Год назад

I've Already made a lot of projects, you can check out my channel

@vinaypatil8009 Год назад

@@RoadsideCoder yaa but that movie app which is awesome project is in react-router-dom V5 That's why request for modern Reactjs project

@DevangPatil Год назад

2 Likes .

@sush5651 Год назад

This truly helped me thnx

@holyhighways 7 месяцев назад

This is not working the polyfill you have written. console.log("start"); const inbuiltPromise = new Promise((res,rej)=> { console.log(2); res(2); }) inbuiltPromise.then((val)=> { console.log(val); }) console.log("end");