click the f**king button man its his f**king dream😂😁😂

"If you ever find yourself faced with a question like this, the best thing you can do is talk through the code slowly and [demonstrate the knowledge you do have], so they know you're on the right track, even if you don't come to the right conclusion." Hands down the best tip for a technical interview of all time. I've assisted with coding interviews before, and the absolute worst thing you can do is shut up, say nothing, or say "I don't know." Even if you really don't know, show what you do know, ask questions, and try to apply what you have to the problem. That will earn you a tip or a hint or a rhetorical question, and that may lead you to the right answer. When I interviewed for my first job, I got two of three questions mostly wrong, but I was actively participating, asking questions, trying to work things through, etc., so I got the position.

when you said "click the f*ckng button" you had me

Christian Bale === Closures. Got it Jeff.

About the question, it's also tricky that it prints 3 3 3 instead of 2 2 2 since the loop compares i to less than 3 instead of less or equal to 3, but it makes sense considering the i is incremented after the last loop (i++) and the last value evaluated is 3, which is false for the iteration but still a valid value for i

3 years writing JS and I never took the time to look up the diff between let and var. Thank you very much.

the trick question at the end would still log 3 three times even if the setTimeout time was set to zero. setTime is an api that does not run in the current js runtime

One day I will watch beyond the 100 seconds, and then I'll get closure

you deserve more than 1 million subs 😊😊

JavaScript is a fever dream 👀 Thanks for taking us further down the rabbit hole

This channel is my favourite. Best content + No bullshit = fireship ❤

Another way to log 0,1,2 with `var` is by forming a closure using an IIFE A good way to solve if the interviewer doesn't allow you to use `let`

Last time I was this early, fireship was not using firebase.

How convenient. Was working on a memory optimization issue today related to this topic, and here you are nailing it and explaining everything in ~5mins Thanks 🤘🏼

Two years ago you didn’t have 2 mil and now look at you! Great KZfaqr you are

My god !! In my 4 year experience it was first time I intentionally used closures. And the same day this video came out. Lucky day

I love your 100 seconds videos, especially when they go beyond 😊. Keep up the good work!

I don't how you do it but your content is amazing. You sometimes cover subtle details that anyone would overlook.

I've said this before, I'll say it again - YOU'RE THE BEST when it comes to these kinds of tutorials.

I finally get it! Thanks for always having concise explanations of complex concepts!

Your presentations are truly awe-inspiring. Despite their short length, I‘m sure the more thought went into them to extract the bare essence for us to digest, with intentions to pique our interests and to motivate us to go in-depth on our own. The appreciation for your viewers valuable time is reflected though the content‘s succinctness and demonstrates self-awareness in this era of mind regurgitation incentivised by the algorithm.

Some people in the comment suggested that you could still use var and log 0, 1, 2 by doing IIFE (immediately invoked function expression) and that is a common solution when you are forced to use var (for example, during an interview). I've been coming back to this video from time to time as my understanding of JS improved, and I have found another interesting solution with var while exerimenting: for (var i = 0; i < 3; i++) { function log(){ console.log(this); } setTimeout(log.bind(i), 100); } So, basically we create a bound log function, and we pass the value of i variable in the current iteration as "thisArg".

This is literally the best video explanation video on closures. I keep coming back to this. This explains why things we take for granted (for ex, debounce in lodash) works. Thanks a lot man.

Man with this content, you deserve millions of subscribers!

This is one of the best channels, short & to the point.

Been trying to understand closures for ages and this video taught me them in 5min well worth it. Thanks.

This is LITERALLY my favorite KZfaq channel right now!!!

Best closure explanation i have ever seen! Good job

I think if you r a teacher,your class don't need hours To understand anything, best channel

These 100 second series really awaken my motivation. Thank you

Love getting that interview question right. Makes me feel like it's time to move past js

This is prolly the best explanation of closures there is!

What a legendary video. It took me around 10 minutes of pausing and rewinding just so I could absorb the information.

Finally understand how var and let work

Love the concise teaching style

The best explanation of a tricky subject that I've ever seen

I learned closure yesterday and you release this vid. Awesome

Probably the best explanation ever for closure

4:13 well, the event loop means that even if there was no delay it would still always run after i is 3. It's not a case of run it a million times and one won't be 3,3,3 due to timing, always 3,3,3. (also event loop in 100 seconds would help out a lot of people, understanding it solves a bunch of problems and I've seen people write in validations which would only fail if the event loop wasn't as it is)

I like the way how you explain things in short time!

THIS IS THE BEST EXPLANATION FOR CLOSURE EVER! I WISHED THIS VIDEO WAS UPLOADED A FEW MONTHS AGO WHEN I WAS INTERVIEWING!!!! DAMNNNN

Thank you! This video saved me in a job interview today!

explaining your thought process is very good advice in general

That was quick! Thanks, man!

I was literally just reading about Javascript closures this morning for an optimization problem at work and then you post this

Even though I know enough js, I would love to watch an entire js series about every important concept just like this one.

I got asked this question in my interview today. I am happy i finally got some closure

i have never subscribed but watch your content. i just subscribed. you Sir are a brilliant mind

Happy to see you achieve your childhood dream of 1 million subs. Your explanations are so succinct.

You deserve way more than a million subscribers ❤️

This is the best video on closure

awesome explanation as always!

excellent explanation thank you! was so confused before

This is the best channel on youtube!

Thank You So Much for this wonderful video............🙏🏻🙏🏻🙏🏻🙏🏻🙏🏻🙏🏻

I'm pretty sure you will go beyond 1 million subscribers... no doubt.

Thanks man, learned a lot!

great video, nice and easy to understand. definitely earned a sub

Aside from the fascinating way you can explain I am always amazed and amused by the images/videos to use! :-D

I needed this. Thank you

beautiful explanation

Subscribed. Your content is awesome

The heap is also for reference types, like objects and arrays, even in pure functions, but I suppose for this video that would be...out of scope 🤪

Beautifull.. you worth 1 million subscribe

Fireship you are awesome 👏 (as always)

Very well explained man.👌👏👏👏👏👏

Styled-Components in 100s 🔥🔥

700k Subs Let's Goooo Fireship

Great Video !!

Nice! Want more videos like this.

Fantastic video!

Great video!

Jake Archibald and Surma do a great job of covering these subtleties of the scoping of for loops in one of their relatively recent HTTP 203 KZfaq videos / podcasts. Strong recommend.

Amazing explanation ❤️

this is a great video !

You are legend🔥❤

OrganicChemistryTutor of programming u great ser

2:09 I literally cried laughing

believe it or not, I guessed that it will console log 3 for three times. But I didn't know that the behavior will change when using "let" instead of "var". There's always something new to learn, I guess.

Hey Fireship! Great video, What's the extension you're using to console.log the values within the IDE next to the console.log statement?

2:02 it's 2024 and almost 3M subscribers. That equals to childhood dream fulfilled three times, congrats!

He Deserve, trillions of subs

I got this exact question today in an interview and guess what I failed miserably :(. Thanks Fireship for enhancing my storage of knowledge :)

Best explanation.

This what I subscribe without thinking 👍

Another way of solving the for loop problem without using let, but taking advantage of closures: for (var i = 0; i < 5; i++) { const log = (i) => { console.log(i) } setTimeout(log(i), 100); } when passing the i parameter to the log function expression, it gets encapsulated and preserve it's value even after the timeout stops... the log function will encapsulate the sate within the for loop. of course in this case it is much better to use Let, since that avoids polluting the global space, but this example is an illustration of the power of closures

Just Awesome

impressive, very nice lets see paul allen's closure

Wow, now I know what a closure really is. Thanks my man. You’re the best :)

Awesome 🧡

I recently gave an interview for a company. I was asked the same question. I wish I had watched this video before.

thanks for another one

good job man

Superb closure for my closure understanding. love your f**kin vid. +1 subscribed :D

Just awesome

You are awesome.

Make more of these, awesome.

Buy using Var also, we are able to print 0,1,2 but fr that we need to write another function, and put them inside in it, var is global variable, so they pointing to same memory location, that's the reason, so we just need to change that position, when everyone loop iterate, so for that we need closure, that definitely solve the problem.

Thanks!

I love you man, thanks for .this