How I Made JavaScript BLAZINGLY FAST

I did a fun experiment to expose the cost of GC
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[@blirdo]

I'm pretty sure that Prime is talking about my code when he says garbage collection.

[@paulheisner]

Holy sh**, i had to laugh out loud reading this

[@ayoub.k]

Your comment wins.

[@asedtf]

My collection of garbage is certainly slow. This statement is true in every possible interpretation

[@ThePrimeagen]

its beautiful but its garbage

[@blirdo]

@@ThePrimeagen I thought it was what's on the inner scope that counts :(

[@artifishul]

Big fan of the more technical stuff like this

[@stasgavrylov]

Man, you should definitely make more of those deep-dives, you have so much knowledge to share. If you could also drop a link to this code in the description, that'd be really useful. Thanks for the great tip!

[@ThePrimeagen]

i will! for you, here you go github.com/ThePrimeagen/yt/blob/master/is-javascript-slow/test.js

[@stasgavrylov]

@@ThePrimeagen 👈😎👈

[@Draxen]

Agreed, straight 🔥

[@HuxleysShaggyDog]

Based

[@Psy45Kai]

Love auch JS deep dives. I am myself a C++ and now (partially because of you) Rust developer and like this performance stuff 😁 Since I just start using JS I like listening to JS ninjas like you are. This is much more interesting than most low level JS stuff on YT 😁 Thanks for your high octane videos ✌️

[@benjaminughegbe4255]

hey, please what's JS ninja? did he mention it in this video? ask cos I may not watch till the end 😬

[@jesusgonzalez5709]

100% agree

[@ThePrimeagen]

just trying to have a bit of fun out here

[@pchick]

@@benjaminughegbe4255 it just means proficient with js

[@benjaminughegbe4255]

@@pchick oh, thanks a lot

[@cal3461]

Awesome timing. Just learned about how Rust manages memory today so this will be a nice contrast!

[@jordanasghar6419]

My favorite type of videos from you! I use JS all the time and see the spread pattern constantly, never thought to consider the GC impact under the hood but makes total sense!

[@alexandersemionov5790]

I love it. Object pool is quite a popular technique in game engines to reuse npcs and so on. Please continue with this format

[@Zzznmop]

It’s crazy that I’ve watched your channel on twitch and KZbin for years and learn something new every time I listen Thank you!

[@scottiedoesno]

Really enjoy the technical stuff! As someone who has more than a casual relationship with JS, these kind of engaging technical analyses are super useful on a very regular basis

[@82TheKnocKY]

I love this! This is the data based advanced stuff that no one else on KZbin really does. With realworld fang experience to back it too!

[@aaronroethe1010]

love all your videos, keep up the technical side and I love your Go content!

[@typeer]

Man I'm so grateful for you communicating this stuff in 10 min chunks so good ty sir

[@filipecrosk]

Mna, these kind of content is all I need!! Thanks for sharing. Performance, performance, performance!!! Learn how to dig inside the runner and understand what parts of your code is taking longer and then debug to get it better is what everyone should learn. I know it's advanced for a lot of people, but learn how to debug is an art that we all should give more attention to. Again, I'm 1000% for more content like this!!!

[@lisyr4918]

I am a junior dev, but even understanding only about 50% / 60% I am learning so much watching your videos, thanks for this incredible quality videos!

[@SiisKolkytEuroo]

Is there something specific you did not understand about the video, I'd be happy to explain

[@odorlessflavorless]

@@SiisKolkytEuroo I did not even the problem statement here. Is it about tweaking the code in a way the V8 engine does not run garbage collector ?

[@SiisKolkytEuroo]

@@odorlessflavorless yeah I suppose you could say that. Or, writing your code in a way that doesn't do as many allocations and doesn't leave much garbage behind

[@vin1208]

@@SiisKolkytEuroo bro tbh i did not understand the first function, the closure i do not understand it, never used it in real life in what case scenario would that function be used so from that i barely understood the whole video, i dont even know class components and what was he trying to do with all that props1 props2 props3 and the vocalbulary he used i didnt understand most of it, im self taught so i only understand code but not terminology.

[@daveisradicle]

Great video, super smart way of showing off GC operations and how to work around them.

[@blackfrog1534]

YES Primeee back at it with the technical stuff. For me this is your best type of content and the streams that lead up to it are so much fun!

[@ThePrimeagen]

yaya! I do love the technical content and i think its super fun.

[@krombopuloslincler4849]

Please do these type of videos more. Love it

[@jamesfoley4426]

I really enjoyed this video and yes I would like to see more content where you do a code review just like this. KZbin is filled with junior developer content. It is hard as an intermediate to find content that improves your skill set/skill level. I think with your knowledge base your technical review of code is extremely beneficial.

[@zuzuz18]

Super high quality video. One of your best yet

[@velho6298]

Great stuff! Interesting to listen these more technical topics.

[@klegsy]

These are the primeagen videos I enjoy the most! Keep them coming

[@fyndor]

Hey Mr./Ms. video editor, loved the "Not sure what he wanted me to do here lol" :D I always forget most of the good content creators have an editor making these guys much better than they would be on their own. You are doing a good job btw, whoever you are.

[@thecoincritic]

Thanks for the content. I've been working on how to rework blockchains without so much promise dependency...love these thought experiments. Best...hope the Volcano experiment works out!

[@MrBaudin]

It was a great video, i would like to see more content like this. My opinion on the vid was that the setup could be shorter, the explanation of the code a bit longer and the ending was perfect! Performance is a difficult topic and these videos really help explain your thought process, please make more of them.

[@Rihsto]

Oh Prime these technical JS deep dives are fire 🔥🔥🔥

[@ds_7]

I loved this, I love your technical videos, MOAR CODE!!!

[@dulanjala]

this is exactly the kind of content needed, deep dive into certain things...

[@chrisjames278]

Love these walk throughs. Great to have more

[@calcs001]

Love this deep dive.. keep it technical, go deeeeeep sir, deeep!

[@chrishamilton1728]

I'd love to see a conversation between you and the React devs about the "Immutable" philosophy. So many new objects, every single render, it hurts...

[@ThePrimeagen]

probably could squeeze quite a bit out on the server if they stopped

[@chrishamilton1728]

​@@ThePrimeagen React's whole change detection system is built around shallow diffing two objects sooooo..... But it's not a design flaw, because it makes your code *_PURE_* 😇🙏 pure garbage

[@marcusrehn6915]

​@@chrishamilton1728 Immutability is a sound concept that is. There are a number of ways to implement it in a far more performant manner. Sadly, javascript arrays and objects have pretty much none of the characteristics needed. There are libraries like Immutable JS, but that also falls short because no library is going to pass us an immutable list, for example after a database query. So you would have to make at least one copy of the array when converting to Immutable. How about we just skip JS on the server, at least where performance matters?

[@pm1783]

@@marcusrehn6915 agreed

[@danielchettiar5670]

@@chrishamilton1728 Imo vdom is unnecessary with modern hardware. If they took that out, react dx would be much better and they also wouldn't have to do the diffing. But that's a monumental change that's never gonna happen. Good that we have other great open source ui libs

[@spitefol5504]

This is the best content I have seen by you, do more like this!

[@codewithguillaume]

Dude I love this video. Got to watch it again.

[@tannishkmankar3998]

IT WORKED, THANKS I'VE BEEN LOOKING FOR THIS FOREVER, BUT NO TUTORIAL COULD EXPLAIN IT AS YOU DID

[@benjaminkindle1841]

The amount of energy this guy can summon while talking about such dry topics is truly impressive

[@leptanian]

Personally I like the more technical videos you make. These walkthroughs and explanations are extremely valuable imo. And as always the editing is top-notch, Flip is the man.

[@fluffykeebz]

2:34 -- first time I have been unable to resist the call to hit subscribe. I have subscribed, Daddy Primeagen.

[@poochy661]

I really like these break-down videos where you show us what not to do and what to do if we want to go BLAZINGLY fast!

[@conradbuck2414]

I wrote a streaming regex engine and it hammers the GC pretty hard because it needs to create an object for each state it passes through, and on any real text and expression it passes through a lot. I studied its perf because I thought I'd have to pool the state objects, but instead profiling showed that I was only spending ~20% of my time doing GCs. That's because v8's generational garbage collector is optimized for the collection of objects that are small, short-lived, and have a common structure/shape. Engineers should not shy away from using those kinds of objects!

[@abneryang2102]

More of this plz. CI jest runs have been killing us and this was cool to watch with that in mind

[@skiesaboveunlimitedstargaz7316]

Awesome & Greatness!! Very Excellent point!! That's why I sometimes, do not use Promises especially if it takes a lot of time.. But it all depends on the data how you use them and put them onto the objects.

[@aburner230]

+1 more deep dives, this is the first video of yours I watched, and it was great

[@ffshawon1287]

It really worked for me after I look and try some tutorials, yours is the one that worked. Owe you a lot.

[@ThePrimeagen]

LETS GO!!

[@_Aarius_]

Lots of the time people are writing code that's more IO bound than CPU bound, but it's still useful to know these tricks for the areas where you are in a hot CPU loop

[@m.minkov]

I have pressed all the buttons! I love these videos, I am incredibly interested in internals and how performance can be increased. Please dish out more!

[@TheKiller9696]

Really enjoyed this content! Would love more videos like this

[@TheKiller9696]

@ThePrimeagen good job, you are big enough to have bots

[@mikebruce6790]

Awesome video, thanks for making this 🙏

[@th34lch3m1st]

I like it. Really inspiring concepts. Keep it up.

[@wlidWisdom]

i love these king of videos .. keep going !

[@AlphaWatt]

Love this stuff Prime

[@markclynch]

Love the more technical deep dives

[@dickheadrecs]

i’m here for this, the hot takes are just gravy

[@c__beck]

I'd love to see one of these showing the Promise issue you mentioned!

[@null_bite]

Love thiss .. keep em coming!! 😍

[@writegoodcode]

dude love this, please make more technical content like this.

[@ThePrimeagen]

I thought it was fun

[@writegoodcode]

@@ThePrimeagen yup it definitely was

[@writegoodcode]

@@ThePrimeagen learnt so much, like sucking mics, etc

[@joaomachado9105]

your amazing but that editor does wonders too, props to that dude/lady whoever he/she is xD

[@CraigClayton-bk3ze]

As a newbie to programming I didn't not have a clue what the Primeagen was talking about, but I still really enjoyed it.

[@GovindKumar-pe4lz]

Thank you for explaining this thoroughly!

[@petrpechkurov3095]

Thank you, Mr. ThePrimeagen!

[@ethSiberianDex]

I love these science adjacent videos, they are like reading scientific articles but more fun

[@alejonanez]

Man, this channel is the best 🎉

[@jogofin4939]

I'd like to see a more in-depth breakdown of how garbage collection works as pertains to promises, and how you circumvented promises altogether. Good stuff

[@nikensss]

I also like the technical stuff, feels really nice to understand better what's going on with the tools you are using. Would it also be possible to share a repo with this code?

[@erikslorenz]

This is great thanks. I usually don't worry too much about it since if I'm using JavaScript it's not in a performance = money scenario

[@willl0014]

I didn't understand half of it, but this was a pretty interesting video. I think i will look into this more. Thank you for sharing

[@ErmandDurro]

Really great content. Love it 😀

[@changuchito69]

love this type of videos!

[@RafaLeyvaRuiz]

I liked the video only because you send me to read the description and the way you requested was funny 😂

[@harrybilsonia]

Prime!! Sending you some algorithmic clues to show more code

[@dontpanicyou]

definitely a fan of these JS deep dives.

[@marcolerena456]

Hey Prime, I checked out your course on Frontend Masters, but I don't wana pay for their monthly membership just for your courses - I'd rather just buy courses from you. Also, I would really love a comprehensive backend course (in Js(ts) and/or rust) from you. You're one of the most entertaining and technically competent programmers on youtube. I'd love to learn from you!

[@DIEZ919191]

DAMN! Finally I found someone who teach like a savage! Usually I find myself sleeping right after couple of minutes of *explaining* something, here in a turn, I want to break my fckn retina display like rock star breaks his guitar! BTW didn't understand how you implemented test example, but it doesn't matter!

[@ThePrimeagen]

hah, well, i do like teaching at break neck speed

[@alexcasillas]

Great video!! Though I’m extremely curious about the refactor of the promises and that performance gain, can you elaborate more on it apart from GC taking so much time? I’d love a video about this :) Great job, love your channel 🔝

[@ThePrimeagen]

I'll do a video on it.

[@Kurimson]

Yea, me too. Definitely Left me wanting more 😊.

[@kiernanacuesta1417]

This is great, thank you!

[@earthling_parth]

I LOVE it! Please more technical stuff! PRIME, I AM SENDING YOU THE ALGORITHMIC SIGNALS PRIMMEEEEE!!!!

[@ThePrimeagen]

Let's go!!

[@codingdude8782]

Do more, I love this video

[@bryanchulander]

So informative. Thank you

[@yumyum7196]

Please!!!! More technical videos like this one 🙏🙏🙏

[@mekhoinfo2118]

the deepest video about JS I've ever watched lol, now I know that I have a long road before me to become like you @ThePrimegen

[@nitheeshraajar393]

How/Where do you start learning all this stuff???? So much in-depth knowledge and its really fascinating. Makes me wanna go indepth too

[@user-pz9qh9rj8z]

thanks a lot!!! so nice reverb

[@LeandroCoutinho]

Amazing stuff! For more profiling like that!!!

[@michaelross3061]

Yay on the technical vids/amount of code. Made happy brain chemicals

[@lopoyadriang.9114]

Thank you, it works perfect!

[@gustavcoetzee5018]

Love this content. Learn good stuff

[@ahmadkhudai]

liked, subscribed, and pressed the bell. Great video

[@thanhn2001]

More please. I like this kind of stuff.

[@tarotv4609]

Thank you for this! Super cool video! A+++

[@StuartLoria]

I liked this video, I would like to see the one where he replaces promises

[@wforbes87]

actual technical content about a language that no one really thinks about technically is the true performance optimization involved here

[@amirhoseinfarhadi2268]

We love this type of videos 😍😍

[@ayca198]

That was great. Thank you.

[@venkateshhariharan4341]

These kind of videos are educational thanks

[@koern82]

Plz do more JS stuff. Thanks for this great video!

[@JRasmusBm]

Favorite vid so far 😃

[@fandimn2628]

Still working as of today! Thank you!

[@TayTayChan]

Yeah, tech-heavy videos are great. Code is life

[@giacomogagliano1526]

you are way too funny =) and also smart!! great job!!

[@g3l0y]

Faster prime, I need this in my project

[@darkveil07]

hanks lot Sir.. You helping us..

[@bryanchulander]

Keep making these