I really enjoyed making this video. Its more of a new style for me, do you like it? Should I do more of this style? (send the algorithm signals!!!)

@the_flask

Жыл бұрын

Yes

@dhruvtekker1220

Жыл бұрын

It's super complicated and i didn't understand most of it. But i liked it bc i wanna learn more about js--> c++ stuff

@matiasbpg

Жыл бұрын

I loved the video. It's really difficult to give content like this that deep dive into the internals

@mouradaouinat8721

Жыл бұрын

Duh

@user-alesomething123

Жыл бұрын

Yes please, I really like that the content is aimed towards explanation for intermediary stuff. Especially the fact that you’ve posted a link for further explanation and I can go and see things I don’t understand. There’s already content on KZread code space aimed towards beginners and people with an agenda to obscure info to sell a course. It’s why I mostly avoid KZread these days and just focus on odin project.

this shows that JS is BLAZINGLY fast. It executes a code that is supposed to take infinitely long time in just an instant. Blazingly fast

@wlockuz4467

Жыл бұрын

It has done executing while Rust hasn't even compiled!

@wadecodez

Жыл бұрын

Or is it infinitely fast?

@igorordecha

Жыл бұрын

@@wlockuz4467 I just thought... You have an algorithm written in both JS and Rust (both in source form). You enter commands "node program.js" and "cargo build && ./target/debug/program" respectively and measure time from pressing enter to the program returning. How large the input must be (the N in big O notation) for rust to win? Then check how building for production changes the results.

@kamuridesu

Жыл бұрын

@@igorordecha I made this test some time ago with python and it really depends on the operation and performance of the machine. Using an 7th gen Intel core i7 and a simples multiplication operation, even with compilation rust executed faster than Python. I assume that JavaScript has a performance similar, if not worse, than python

@HuntingKingYT

Жыл бұрын

@@igorordecha cargo run**

To summarize (please correct me if I misunderstood): - The infinity case is just special handling where it's treated the same as 0 - Any other number gets casted to a 32 bit integer so some of the bigger numbers get truncated to small or even negative values - Negative values are handled effectively the same as 0

@ricardoamendoeira3800

Жыл бұрын

What I don't understand is if you're making a special case for infinity why would you run it immediately instead of simply not scheduling it at all?!

@MrSuperNova46

Жыл бұрын

@@funnyav "This is the way"

@alxandr90

Жыл бұрын

@@ricardoamendoeira3800 As far as I understood, the converting of Infinity to 0 has nothing to do with `setTimeout`. Rather, `Infinity` converts to 0 if you try to treat it as an integer. If you do `Infinity | 0` you get 0.

@nathanhedglin931

Жыл бұрын

@@funnyav divide by zero would be NaN. Weird stuff

@rosenthalpiano

Жыл бұрын

@@nathanhedglin931 setTimeout with NaN also executes immediately. Fun huh?

Excellent video. This video has less of a "look how shitty JS is" vibe and is more just a great deep dive into the internals of V8.

@ThePrimeagen

Жыл бұрын

thats the point! no need to bag on JS, its been bagged on enough, its more "why" does it do something

@SleepeJobs

Жыл бұрын

👍👍

@ricardoamendoeira3800

Жыл бұрын

@@ThePrimeagen Actually I think this was more the "how it happens", in the future it would be nice to include the discussions on why some decisions were made (from issue trackers, PR's, etc. For example why choose to treat infinity as 0 instead of not scheduling the callback at all.

@lawrencedoliveiro9104

Жыл бұрын

So basically, it is V8 that is shitty.

@jongeduard

Жыл бұрын

For me it's not completely the first thing about V8 that I have watched around the subject of data types. I forgot which video it was, but it was some years ago and they had a very detailed explanation about the V8 engine and how you could write your code smarter to become more high performant. They also talked about SMI numbers and how using arrays of SMI's where the most efficient ones to use (because of preventing those extra pointers and memory allocations), also how important it was in general not to mixup several types in the same array. For example 1 object or string inside your array also containing numbers makes the whole thing based on extra pointers and allocations (in other words, the whole array becomes a boxed one). It's also true the language has a ton of initial design problems. But other languages also have their issues. C and C++ have their own huge problems for example (being very unsafe and vulnerable for example). It's great that powerfull JS engines exist these days. I would like to know more about the Firefox JS engine as well. Because V8 is not the only workhorse one that exists.

this type of content on programming is what we need more!!!

@chrismuga

Жыл бұрын

Facts

@DiscipleW

Жыл бұрын

@@chrismuga

More videos like this one please!

@ThePrimeagen

Жыл бұрын

ya!

@DiscipleW

Жыл бұрын

​@@ThePrimeagen And make them pretty LongLongLong xD

Massive props to the v8 devs for making a garbage (collecting) language actually performant, these optimizations are just insane. Also SO to the people working at JSC and SpiderMonkey

@ThePrimeagen

Жыл бұрын

yayay! its nuts that v8 team is so talented they took a language that is TERRIBLE for perf and made it semi decent. its ackshually nuts.

I know we are kinda making fun of JavaScript but.. its so educational it just makes me love JavaScript more. You're great at doing this type of content. Definitely do more.

@peternoire

Жыл бұрын

I said we as in we made this video together apparently. I don't know why I typed that.

@ThePrimeagen

Жыл бұрын

btw, i am not trying to make fun of javascript, just trying to have fun with it :) and try to explain things in a fun way!

@RainOrigami

Жыл бұрын

classic case of stockholm syndrome

@peternoire

Жыл бұрын

@@ThePrimeagen you killin it, thanks for the good content. 👍

@professornumbskull5555

Жыл бұрын

Yo... You love JS? Are you alright? Do you need therapy? /s

Love love love this video. This is the kind of stuff that really gives so much insight into what's going on behind the scenes. Thanks a ton for taking the time, not only to figure out why, but also to explain it so well.

@ThePrimeagen

Жыл бұрын

:) ty bud !!

Great video! Love seeing in-depth JS stuff! It's crazy impressive how much work V8 does to make JS run faster

This is so entertaining as well as informative. Learned a lot! Found you from the vim and algorithm courses on frontend master . Huge fan of your teachings

I am so happy that I stumpled across this channel. You are such an inspiration, your videos are so well made, funny and you are very authentic. Love it! Thank you very much for your content!

Diving into internals is always fun ! When everything gets demystified after a long and arduous journey of grepping and filling your brain with as much as you can, it's sooooo satisfying.

I remember at one point in time, long ago, being very confused by fixed point numbers. Floats are horrifically slow on microprocessors that don't have dedicated floating point hardware. This somehow brought me back to that time.

Really enjoyed this video! Love covering these details that are much more in depth than what you regularly see. Thanks! :D

I loved this!! Would really enjoy seeing more intricate and technical details of the browser’s implementation. You have a great instructional style

This video was awesome. I'd love more stuff like it, and also more stuff on your learning process and how you set about getting such in-depth knowledge on nitty-gritty stuff like this.

Saddens me that not more people are doing videos like this and there are some concepts you go through very quickly but nevertheless I like how you explained a single thing in detail quickly while throwing in knowledge and remarks about how things work

This is really important to teach that! Don't be afraid to understand the internals and check the source code. Amazing video

More of this, please. I've never seen what "under the hood" of JS before this video, and this was an awesome introduction to the WHY behind the weirdness.

Love these deep dives! Keep them going please. :)

I really enjoyed this video, this kind of content is great, is beautiful to see how "high-level" code, works all the way down and spot this kind of tricky things.

@ThePrimeagen

Жыл бұрын

:)

Very informative and interesting, please more of those videos when you brake the javascript code into c++ code!

Awesome video, short and full of interesting information and analysis!

This is amazing! You crushed this new format 🔥

@ThePrimeagen

Жыл бұрын

oh bash... stawp

I just found you, Prime, and man I became a fan BLAZINGLY FAST!

@ThePrimeagen

Жыл бұрын

LETS GO!!!

Brilliant Video. Absolutely more, please!

That’s quite deep indeed Amazing video and thanks for sharing your knowledge!

@ThePrimeagen

Жыл бұрын

yayaya

I loved this video. It explains the situation really well.

This was actuall very interesting, I was building a project for university with Rust to Webassembly and a lot of the ideas that you explained here to interface JS with C++ actually apply directly or similarly to wasm-bindgen, including how there is a wrapper struct for passed and returned JS values.

love your videos (waiting on your rust ergonomics vid btw 🥺)

This was simultaneously interesting and confusing. I'm not smart enough for this, should I be ashamed? lol

@ThePrimeagen

Жыл бұрын

i think you have achieved a victory?

Super interesting! Would love to see more content like this

It’s actually refreshing to see a JS dev with a good understanding of under-the-good mechanics. We need more like that.

Absolutely love this kind of content!

God I love these videos. Thanks prime.

Thanks for that video ! Props for Westbrook usage :D

I just watch your course about vim on frontend masters and I love it.

I also didn't fight anyone, i got a stye, a duct in my eye closed and eff'd me for a few days...

@tini_

Жыл бұрын

hmmmm, your last sentence "he is the best Engineer I have ever worked with" sounded kinda sus. Blink twice with the other eye if you need help!

@lawrencedoliveiro9104

Жыл бұрын

Hey, it was a chance to use the old “you should see the other guy” joke ...

Wow awesome video :3 the more technical the content the more prime shines

Loved the new format!

@ThePrimeagen

Жыл бұрын

lets go!

I like understanding stuff like this by inspecting the source code. Very nice video, thanks :)

Love your videos❤

@ThePrimeagen

Жыл бұрын

hey thanks stefan :)

def looking forward to more of these

I love this video, I'd like to see more of this type.

This style of video is pure gold 🔥🔥🔥

I loved this Deep dive. Been working with JS for the past 10 years I never knew about this :) I'd love more of this and would perhaps now start looking into the chromium source code myself as well! Thanks the swolleyeagen

You are the senior I'd like to have in my life... Awesome video!!! ❤

@ThePrimeagen

Жыл бұрын

hio! ty bud :)

I really loved this video!

This really is some next level sh*t! Thank you very much. I was already enjoying your content a lot. But this teaches people how to find out stuff by themselves, along with providing a very deep understanding of this specific topic. Again, thanks alot! MORE! :D

@ThePrimeagen

Жыл бұрын

yayaya

Nice investigation, many thanks!

I really liked this one. Keep it up.

i am gonna have to rewatch it a couple of times to understand it, my brain is not cooperating today . Thank for this video.

a fascinating piece of knowledge I'm never gonna need

This video is beyond amazing!

@ThePrimeagen

Жыл бұрын

oh well ty :)

That is some juicy ass content. Loved this format, you keep getting better and I'll keep coming to you (wat?)

@ThePrimeagen

Жыл бұрын

LETS GO, KEEP COMING BABE!

Thank you, Mr. ThePrimeagen!

This video is pure gold, I learned how to research things.

Great video, thanks!

you sir are just different! in a very awesome way!

Please do more of this......awsome content

Thanks really amazing and informative video

Amazing vid, may have to watch again but neat

Amazing drawing skills!

Awesome type of vídeo! I want to see more

this is an awesome channel

alright, wow. that was an interesting dive into V8. thanks for "What JS really looks like 101"

Good video, do whatever you want dude.🙏

Yes, entertaining and knowledgeable 💥

Follow-up question: what does the spec say? Is this Google’s interpretation, or do all browsers implement SetTimeout this way?

@lawrencedoliveiro9104

Жыл бұрын

I had a look at the MDN page (probably the most readable description I could find), and apart from warning about non-numbers being implicitly coerced into numbers, it says nothing like this. There are situations where delays may last longer than expected, but they should never be shorter. So it seems like this is some kind of weird Chrome/Chromium bug.

@Vim_Tim

Жыл бұрын

@@lawrencedoliveiro9104 MDN is not a specification… I believe ECMA-262 is the authority for this behavior.

@Vim_Tim

Жыл бұрын

I found the answer: the W3C HTML5 standard says “if timeout is an Infinity value, a Not-a-Number (NaN) value, or negative, let timeout be zero.” So this is behavior is by design.

@lawrencedoliveiro9104

Жыл бұрын

@@Vim_Tim But that doesn’t say that large values should overflow.

@omarb155

Жыл бұрын

It it interesting to consider edge cases like in this video, but hopefully this issue shouldn't arise too often.

This style reseembles a lot with what I do at my job, but without SAP frameworks… fortunately for the rest of the viewers. Pls do more!

Liked for the instance promotion. Thanks prime

More! More you son of a bitxh!!! More content like this, it’s absolutely amazing ❤❤❤

I hate js, I am doing challenges to write web apps without touching js, but this deep dive is just great. Makes appreciating it much easier (it's still hard tho), thank you really much!

Really special content 💖

@ThePrimeagen

Жыл бұрын

i feel special sometimes

Really interesting content!

@ThePrimeagen

Жыл бұрын

ty

sometimes idk wtf ur talking about Prime but it’s soothing to hear ur voice

We need more of this type of content...

Reviewing an example of chromium doing something seemingly unexpected while on Firefox, truly a chad move

Good vídeo , very interesting

I didn't know gimp can be used to create tutorial videos like this. This is amazing.

I'm a little stopped up in the ears tonight, and a lot hearing impaired every night, and the speakers on my laptop are lousy. @ 2:40 I thought you said "ideologue" which certainly could figure in philosophically between the loosy-goosy world of JS and the cold, heartless metal of C calls ;-) -- oh, you actually said IDLong

This sparks joy!!!!!!!!!!!

man, it's blazingly amazing)

Amazing stuff dad

I love your channel❤😂

This is hilarious. Reminds me of an ancient Sinclair calculator, very cheap, which got things wromg; the fun was to work out why. Lack of RAM - can't deal with edge cases, oh well, WTF. Javascript does not have that excuse.

@ThePrimeagen

Жыл бұрын

hah, i like investigations, they are funny

Loved the video tho, pretty informative ❤

my mind is exploded from this explanation😵

@ThePrimeagen

Жыл бұрын

hopefully in a good way

@medamine3142

Жыл бұрын

@@ThePrimeagen HAHA right

It's kind of scary the number of assumptions or best guesses a web browser does. The last time I dove in Chromium code was to find out why it was trying to autocomplete a random text field in my form as a credit card number. Lots of obscure heuristics.

@ThePrimeagen

Жыл бұрын

its crazy out there :)

So in summary, setTimeout expects a 32 bit signed integer and overflows . Thanks for the video. I actually didn't know that

This time i finally could understand a little c++ in production.

Awesome mate!

this is awesome lol gonna farm that promotion now brb

Nothing like pulling out the ole 2's complement to see some jaws hit the floor

Gréât vidéo, very instructful

beautiful, prime

So in the first few seconds my mind already jumped to "32 bit signed integers" and it turns out that was right, but I didn't know the default behavior for something larger was 0. The spec is really fascinating, especially since it includes so much stuff that JS users (like me) would love to see changed, but it can never change because JS has to be backwards-compatible forever. There's always a _logical_ explanation for JS weirdness that made sense at one point in time, but that doesn't mean it's always rational in 2023 (except for typeof null, which was just an accident, but now we're stuck with it).

Thanks for sum it up your stream 👍 Request Topic: JSX vs Go template vs Mustache (i.e Ramhorn)

Classic case of "Weirdness from under the hood" 😂 Wonder how many JS devs were like "Cwutwut now?"