How Async Javascript works (Callback Hell, Promises, Async Await, Call Stack and more)

[@developedbyed]

I think it would be really fun if we did a series on focusing on one specific aspect of Javascipt and make a fun series out of it! Example: A full episode on event handlers (how to make a custom one, how it works, etc etc) 👀 Let me know if you like the idea 🔥 Anyone playing Street Fighter 6?

[@yoJuicy]

Great ideas Ed! thanks for teaching. Youre hitting 1 million this year bro! I love the idea of intermediate/advanced concepts because often times people explain things shallowly in their examples (for time) so its difficult to understand concepts when you want to use them in your own way. Other concepts that are kinda important: prop drilling (now with client & server comps this is critical) Closures [functional programming], prototypes, OOP, event loop, Linked list, Hash, BFS, DFS. Cheers

[@belkocik]

That would be nice :)

[@dev_franqqi]

That sounds fire

[@joseduargu]

amazing idea

[@marshall-brown]

Yes, full send that idea!

[@gambomaster]

Thanks again my gorgeous teacher on the internet. 🙏

[@FaithFedora]

Love it 😂😂😂

[@JanakiNarayana-cm8fn]

😂😂😂

[@SarveshSawant-zk7xy]

02:13 - Two types of context 06:54 - first console log, third and then second is called because of call stack 08:22 - Call Stack 14:54 - Call Back Hell 19:50 - Custom Promise Example 22:43 - Real word promise example 26:35 - Async and await example

[@Ndzzle]

SetTimeout is a webAPI. This gets handled by the browser instead of JavaScript. So instead of going staight into the queue, it goes into the WebAPI stack until the time is up. Then gets pushed into the queue, behind the other logs which is why it shows up last

[@shs4293]

Been working on Js since years but trust me, haven't found callbacks & promises being explained like this, even a junior dev could understand this without any hassle.

[@patricklemmer-adeveloperss3458]

THE best video I personally have seen about these concepts. I have started learning how to code early last year and JS is still very difficult for me at time. This video has helped me understand things in 30 mins that I have not understood in the last 1.5 years. Huge compliment and please keep doing these basic concept JS videos, they are gold!

[@bareenlars]

Hi, great video! New to promises and await, @26:45 why do we need to await when creating the const data ? isnt the variable response already set/saved? or is it just a placeholder for the function? If so, the await command is already in the response variable. Just trying to understand :)

[@anna-booklove]

Great timing! I‘m working as a react developer for 1 1/2 years now and sometimes I‘m just not aware of some of this concept. This was super interesting to get a little refresher and a deeper understanding!

[@robgioeli]

I’ve been coding for close to 8 years now and have been been watching videos for quite many years and I’d just like let you know that your recent videos have been gold. I think the basics and creating clones of apps are long overplayed and many people will benefit from videos like this. Awesome teacher, would love to see you teach people more technical stuff like you have been the last month 👍🏻🔥

[@RychAhlberg]

You’re so good at explaining thoroughly. Thank you very much!

[@костякосогоров-з9о]

This is the first KZbin video that made me happy, thank you my friend, I've wanted to understand this topic for so long and finally I found someone who could describe the workings of JavaScript so thoroughly.

[@CristianKirk]

Super nice to see actual programming in this channel and not just trendy frameworks conventions.

[@yanndjoumessi7130]

That's definitely a great video to put everything in context. I personally would like to see such a format with different JS topics. I don't think that it's really entertaining but for people loving to understand deeply what's going on, it's definitely a much better approach.

[@Kuramas_Chakra]

Microsoft's True Intention Leaked at 7:18 !

[@getrogo4474]

7:56 caught me off guard hahahahahaha

[@SolidJello]

The first video that actually got straight to it with live examples and helped.

[@saadafm]

This is EASILY the best video on these topics

[@srikarravoori124]

After a long, I see you. By the way seeing your video I happened to become a software engineer at the age of 41 and completing 3 years now

[@alfiartya23]

As always, the way Ed teaching me with his funny way that makes me easily understand again about this context. I remember first time I learn Javascript is from Ed JS playlist, so thank you so much Ed! 😄

[@anonygsc6851]

Hi Ed, I really appreciate your videos as i decided to use a JS framework to rewrite a project that was pooly optimised in a different technology. It really helps to watch someone when reading docs becomes tiring. Thanks

[@realworldcodingapplications]

i absolutely enjoy this kind of humor when I'm learnign to program, so thank you for that! Makes learnign much less mind numbing

[@vinci-g]

"Time's up m*therf*cker!" Had me on the floor rolling LMAO

[@justfun591]

This video is must watch if you're are going for an interview

[@deepakroy3459]

I am telling you,This guy is a GEM❤

[@Antonio-yn4mb]

When your team leader is Samuel L. Jackson 7:55

[@kvebalas5931]

9:30 First in First out doesn't work that way. It pushes on top, but process the first (oldest) one on the bottom.

[@zeusor]

He meant Last in First out LiFo I guess

[@ichiroutakashima4503]

I love this. Always good to watch such concepts because it's a refresher.

[@ankamsarav]

I feel the remove function which you showed stacking in call stack section is wrong because queue will not push the functions unless the stack is empty

[@Richard-LaFleur]

9:28 Shouldn't it get pushed one by one, only when previous removeTodo() finishes and call stack is empty, and not everything at once?

[@cmdrTremyss]

Love the new format, I think I finally get how async works

[@maherylala2153]

Really waited for that one from you, thanks !

[@ways.]

this is my new favorite channel

[@enigmaSpy]

Nawet nie zdajesz sobie sprawy jak bardzo długo szukałem tego typu video, spadłeś mi po prostu z nieba❤

[@naczelnypsycholog6296]

to jest Polak ?????????????????

[@AyJay123]

7:55 im going to say this everytime I run a setTimeout from now on 🤷‍♂️😂

[@iitz_danny]

I just had an interview that went over these concepts too. Wish I would have watched this video beforehand. I’m definitely turning on the notifications now😅

[@aftonlawver3827]

Great explanation of the call stack vs the web API's and event loop!

[@testingBuyer]

wonderful and precise tutorial ,wins a subscription

[@fried-eggscelleration]

Nice video, but how can I get a value from the response returned as part of the function? Seems like the return value of a async function is always a promise? how can I get even maybe a wrapper function to just give me a string in the end, after waiting for the result?

[@CodeWithCGPT]

Hi Man I am seeing you after three years thanks good your video very help for me when I am fresher

[@6slave]

what extension do you use to have icons like that?

[@RVAraghav]

I have been following you for many years now and the excitement never stops when I see your video every time. Btw the video clarity is fantastic. What’s the camera you’re using? ❤

[@encourage-fm3fo]

This was fantastic! Exactly what I was looking for.

[@SecondBekfast]

Are you using an OLED tv as a monitor?

[@endritibra4351]

This was a masterpiece by Ed, a comment from an experienced developer

[@nickveldkamp5396]

Do u create also a video about Axios ;) ?

[@diganta64]

One of the best session watched..:)

[@anandumdharan6283]

Much needed bruddah......thanks a lot ed

[@jayaprakash_dev]

do the web APIs run in different threads?

[@juliensavary]

worker threads are changing the single threaded nature of js

[@chaimaegrich4510]

Hi Ed, can I get the name of the music in the background please

[@mostafakheder7721]

Nice work , I believe this episode is great

[@andreeapurta457]

I wanted to find out how the promise and async func looks on stack/queue/api...

[@Pareshbpatel]

Async JS; nicely explained. Thanks, Ed {2023-06-27}

[@DawFa10]

Great video, and really well explained on the different concepts!

[@chhavimanichoubey9437]

I was unable to hold myself when you said 2000 seconds.

[@paulthomas1052]

Great demo and explanation. Cheers !

[@nasratt]

What is that VSCode theme? anyone knows?

[@ahmadbilalfarooqi]

i gona revised function and your teaching way is sooo awesome async function is more than easy by Promise

[@deepanshusharma9311]

WOW🤩 Very nice Explanation

[@hiafraan]

Thank you for the great explanation! ❤️

[@Terms-and-Conditions]

Would it look better if you flip/mirror your camera horizontal? so it looks like you are looking at the actual content while showing it to us

[@momomadi2]

nice explanation -- thanks bro

[@БогданЯцентюк-ч9ч]

Thank you! Good and useful content 😎

[@zeusor]

I think he meant Last in First out LiFo 9:36

[@fullstackspiderman]

@Ed, could you please create testing React App courses or KZbin videos using RTL, Vitest for unit and integration and Cypress for E2E testing

[@kimhwanhoon]

Love it thank you so much man!

[@parsina4971]

thanks pal❤❤

[@KaiaLoken]

Thank you for this

[@apex-lazer]

Faking luv you eddy Boiii!

[@joshuamackinnon1250]

Great video!

[@aps69]

Add those chapters Ed

[@TJPBataller]

I thought callstack is FILO. or FIFO? not sure anymore.

[@MaxenGaynier28]

Dr. Strange is teaching programming now? That's cool..

[@robgioeli]

Hey ed 👋🏼 also if you like live wallpaper, Razer makes amazing high quality software that I think called Cortex? High quality live wallpaper 👍🏻 best I’ve used!

[@nareshg128]

just awesome .

[@JohanDeGroot1982]

THANK YOU!!!

[@spaceageboys3485]

Made my setTimeout for 2000 seconds and waited over half an hour…

[@singingrockstar9698]

😂😂😂 tick tock tik took tiMesuP !!!😅

[@pfcokelly]

Tik tok, times up MFer. Great lesson!

[@LászlóKis-d1t]

7:43 --> *ms

[@SebastianOnofrei]

I was very concentrated on what you explain then you came with the ' tick tac , tick tac , tick tac , time is up mothafucka' :)))) MY BELLY HURT BECAUSE OF LAUGHING . Other than that , excellent explanations ! Multumesc frumos ;) !

[@ServanFICHET]

Always love your videos but the examples are a bit confusing. I think some people might be lost… Just an honest feedback! Keep the good work! 👍🏼

[@developedbyed]

Oh that’s alright! Which bit did you find confusing? 😊

[@ServanFICHET]

@@developedbyed for example, the part on call stack, web APIs and event loop. I guess it is a bit difficult to understand for a beginner with the examples chosen and Excalidraw. (I know it is not easy to explain and understand visually) Also on the promise, at 18:52, I think you got confused because you called in the user object the attribute “user” instead of “name” and I would have continued in you example instead of fetching jsonplaceholder. For example, you could have created a promise which resolves if user name is “Blanka” but rejects if user name is “Ken” and then illustrates it in the .then.catch chain, and finally use the same example with async await… No offense, I am just providing my view but I might be too picky ;)

[@gorkemtr]

thks, take care of your health

[@manshulduggal5482]

2:30

[@anony88]

Ed I need another video like this but explain it to me like I'm 12 lol

[@naczelnypsycholog6296]

love the sweater❤, no homo

[@andrewSantosMaia]

You re really funny!

[@vitaminprutin8217]

loved it

[@morale3056]

Damn! Nice and easy!

[@vanshshah7781]

Amazing

[@consoledoterror971]

nice refreshing video after a long time. i would say you could have started with hoisting first.

[@TUSHARMORE_09]

Thanks! to Gorgeous teacher on internate 💝❤

[@aadarshverma6913]

theon gratjoy

[@nishantpatil1632]

keep eye on health buddy...

[@salotspread]

putangina you described it the best very noice moite i subbed.

[@Rashik25]

😊 Awesome

[@APG9tvlivenews]

🎉

[@98f5]

is this stuff really considered advanced?

[@germantoenglish898]

Don't forget about the Swedish and Norwegians 😉

[@anshvashisht8519]

can i get the source code for this video?