Learn Closures In 13 Minutes

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Learn Closures In 13 Minutes

Рет қаралды 65,224

Web Dev Simplified

Күн бұрын

Пікірлер: 91

@usmanquickcode Ай бұрын

I just gave my interview and in this interview they asked me about closures. which ofcourse i have no idea. I have used it but no idea what is called. and i open my youtube and boom you are there. really like the simple explaination.

@anothermouth7077 Ай бұрын

Those know-it-all interviewers always play with these gotcha questions which are not even practical anymore

@looming_ Ай бұрын

@@anothermouth7077closures are pretty important tho

@thecoolnewsguy Ай бұрын

Such useless interview questions. They really need to ask about the job instead of stupid shit that you're not gonna use 95% of the time

@jessecalato4677 Ай бұрын

@thecoolnewsguy you will use closures constantly though, and terminology is important for proper communication...

@thecoolnewsguy Ай бұрын

@@jessecalato4677 I know. Yes closures are used extensively but asking about the var gotcha in a loop is just stupid like who's gonna use var in 2024 for a new code?

@joesharp3580 11 күн бұрын

Just incredible video as always. Somehow you always get to the absolute core of a concept and then demonstrate it beautifully

@mewansynniang1902 Ай бұрын

Beautifully explained

@PavloBozhok Ай бұрын

Thanks a lot, I know and remember how closure works in javascript, but I never knew about something tricks.

@xzex2609 Ай бұрын

React vue and angular use closures all the time , all functional components are closures

@maciejzettt Ай бұрын

As well as state management is

@Regeneration1996 Ай бұрын

And react hooks to 😅

@xzex2609 Ай бұрын

@@Regeneration1996 of course in the end a hook will return some functions as objects and states too , when I was said react I mean most of it uses closures

@mhadi-dev Ай бұрын

Best used in Factory design pattern.

@RaimundoAraujoCorrea Ай бұрын

I use one type closure all the time, combined with promises, when I have to execute a function on an array of data asynchronously, all you have to do is return a promise with a function, inside create a couter at 0, create the function thats going to process an entry, before return, incremente the counter, and excecute the inner function again, when its done, resolve the promise.

@matheusneves688 Ай бұрын

Thank you! Amazing content!

@jovi9918 Ай бұрын

Great quick watch

@lesalmin Ай бұрын

This is the best explanation of closures I've seen (including your own previous explanations).

@captkalik Ай бұрын

That for loop let var closure interview question is just brutal

@karimkrimou399 Ай бұрын

Excellent and really clear approch and explantion

@24306529 Ай бұрын

dude be selling 10 other videos within 1 video

@TalesGrechi Ай бұрын

Great video!

@tommysmith5479 Ай бұрын

So, if I can sum up and get confirmation: a closure is where an outer function or scope is not garbage collected because there is an inner function that relies on the outer function or scope's variables... is this correct?

@manpreetjord1885 Ай бұрын

Great video as usual. But Kyle, your 1x Playback speed feels like 1.25x bro. 🙂 Interviewers also ask that how you will print 0,1,2 when using var i=0; . We have to use the concept of closure here.

@saurabhshrivastava5383 Ай бұрын

Hello Kayal, In your second example for closuers "function elementCreator(element)", if we directly return document.createElement(element) instead returning a function then what difference will it make, I think direct return will be better, what you suggest.

@AlejandroPoleo18 27 күн бұрын

❤ love it

@doniaelfouly4142 Ай бұрын

Thanks

@crakyanime8903 Ай бұрын

it would be good if you cover conditional scope or conditional closures

@alexandraweather4156 Ай бұрын

Thank you for this video and the job you do, but what is a JavaScript Developer? The only thing i could find is "JS developer" - in react, angular, vue and stuff Is there atually a job for JS developer in JS?

@QuanTran-wt4yt Ай бұрын

Can you make a video talking about message queue?

@Kingreey Ай бұрын

Excelent

@consoledoterror971 Ай бұрын

I think the explanation for var, let with for loop is a bit wrong. 🤔

@amiryankolovich8560 Ай бұрын

I ran the code with the var and got 0,1,2 🤔

@amiryankolovich8560 Ай бұрын

Oh its because i had an error few lines before this I guess its js weird engine

@ironCheval Ай бұрын

Does it keep the dependant variable and delete the old ones? E.x. when you added age = 30, will age = 29 be kept still by javascript?

@MbzMOKKA Ай бұрын

No because it's the same memory spot. In his example, when he does age = 30, it overwrites the value 29 in variable 'age', instead of creating a new variable.

@iftekharhaidar2397 Ай бұрын

Dear, could you please explain what is JavaScript reference memory?

@himalayagupta7744 Ай бұрын

I had doubts for this last example, so I asked gpt to explain it to me deeply. It errored the first few times but at last gave the correct answer which claude also verified. Yes, for each iteration of the loop, a new scope is created, and within that scope, a new binding for the variable i is created. Here’s a detailed breakdown: First Iteration (i = 0): A new scope is created. A new binding for i is created and initialized to 0. The setTimeout callback captures this binding, so it logs 0. Second Iteration (i = 1): A new scope is created. A new binding for i is created and initialized to 1. The setTimeout callback captures this binding, so it logs 1. Third Iteration (i = 2): A new scope is created. A new binding for i is created and initialized to 2. The setTimeout callback captures this binding, so it logs 2. In each iteration, the let declaration ensures that i is re-declared and re-initialized within the new scope. This results in three separate bindings for i, each one unique to its iteration.

@Mari_Selalu_Berbuat_Kebaikan Ай бұрын

Let's always do alot of good ❤

@mcRidersEvolution Ай бұрын

What is the purpose of returning function which returns element and not returning element with the first function?

@plamenyordanov131 Ай бұрын

Printing 3 times 3 has more to do with the event loop than closures

@ajiteshmishra0005 Ай бұрын

Hii brother... You explained let and var concept in for loop. But still I'm confused. Can you explain in some other way.

@Pareshbpatel Ай бұрын

JavaScript Closures, bautifully explained. Thanks, Kyle {2024-07-09}

@siasquad7360 Ай бұрын

Sir please explain with the help of draw and after that code

@sealsharp Ай бұрын

I was just wondering, is it possible to see the what structures&code JavaScript actually creates? Don't know how to call it. In C#, you can see the different stages ( C#, IL, ASM ) and that makes perfectly clear how closures technically work.

@letsbeafraid2233 Ай бұрын

JavaScript doesn't create code it gets JIT compiled into machine code directly by the engine. Read about V8 and how it works

@supernovaw39 Ай бұрын

Unrelated but why are you running VS Code as Admin? 🤔

@AlThePal78 Ай бұрын

I honestly thought that it didn't call function too until it said return function to and since the variable was already age 30, that is why it started with 30. What if you called the function first?

@emmanuelameyaw5686 10 күн бұрын

Is there a real world use for it??

@green-coder-clj Ай бұрын

I misread the title as "Learn Clojure in 13 minutes" 😅 Clojure & Clojurescript indeed help landing a job for the FE.

@dfields9511 Ай бұрын

Pascal lets you do this as a well, never used that feature of pascal. But was forced to Learn it

@viallymboma9874 Ай бұрын

In fact the concept of react custom hooks relies on the notion of closure When you're building a react custom hook, you're actually using closure.

@DanielBrownsan Ай бұрын

I genuinely thought I had the playback speed set to 150-200% for the first 3 minutes of the video.

@MichaelKire Ай бұрын

Fun fact. Classes in JS is actually just syntactic sugar for a closure with a special constructor/prototype function inside

@charleschukwuemeka8482 Ай бұрын

While watching the video, this came to my mind... It's nice seeing that someone else thought of the same thing

@trombecher Ай бұрын

A class is syntactic sugar for a function, not necessarily a closure. A function becomes a closure when capturing variables from the parent scope, not because it’s a class.

@alienews0 Ай бұрын

5:00 nope u didn't called your function on that line, u declared it ; u called it on the last line : return func2

@trombecher Ай бұрын

If you have a global function that captures a variable from the outer (global) scope, then this function is a closure, because a closure is a function that captures variables from the parent scope. Even if you are calling console.log, because console is a variable in the global scope, you are capturing a variable and therefore your function is a closure. The only functions in JavaScript that are not closures are pure functions. Please do some research before making a 13min video about a topic.

@looming_ Ай бұрын

Really makes me wanna buy his “course” xd

@user-ik7rp8qz5g Ай бұрын

What you describe is just oop, but with extra steps

@aqibmalik6313 Ай бұрын

first comment after first comment of arunkaiser😂😂

@johnpatrickoldfield534 Ай бұрын

Do you know how to do that integer story with a public bank website inside a private login inside page two with a currency and interger value where I need to insert a legal agreement account balance update from 0 => R 1 000 000 Zar ? It’s a public https web address?! The javascript wipes the direct insert after page refresh how do I make the interger value const? Do you have team viewer and want to try and or show me?

@JacobZigenis Ай бұрын

Hate to break it to you, but absolutely no one is going to help you with manipulating a bank website. Further, what you're seeing isn't just javascript wiping the value. It's retrieving the value from the bank's servers, which you cannot modify no matter how much you manipulate the page. Gotta study up a lot more and stop asking for advice on malicious activities on KZfaq. Also, on the off chance you do manage to do something malicious, you will almost certainly get caught.

@johnpatrickoldfield534 Ай бұрын

@@JacobZigenis my laptops storage is full and not booting at the moment so I cannot screenshare. I don't see how it's my problem the external and Internal banking staff cannot manually show me howto insert credits into bank tables in cobol or whatever the language is from the email pseudocode to the browser web security layers in the osi model so that I may make debits to pay attorney legal fees for bank account topups. I think it's worth a trial investigation ie look, screenshare, record discuss, etc and a look into the file and code framework on the Javascript and in the console just for a deeper explination, because I just know sql server, table updates, hidden servers, html, Javascript and css. The actual coding language and topology to see exactly where the update changes are made. Worse case the system gets reported and then gets fixed. I don't think it's too complicated less than 1000 lines of code plus minus with like 400 lines on my screen at once with like 30 lines each side of the zero balance variable.

@Efecretion Ай бұрын

Closure to scoping is like 0/1 to binary -- closure is how scoping is implemented in JS, while 0/1 is how binary is represented typically.

@BMikel Ай бұрын

Please create Next js e-commerce project catalog with multiple checkboxes filtering, sorting, pagination, search. More e-commerce realistic. Thank you.

@bobwilkinsonguitar6142 Ай бұрын

I think you should do it!

@arunkaiser Ай бұрын

First comment

@aniketroy03 Ай бұрын

autograph pls 😂

@Pacvalham Ай бұрын

🥇

@jovincebrillantes1042 Ай бұрын

So they're called closures, well I'll be dammed. I've been calling them higher order functions all this time.

@rico454 Ай бұрын

They are kinda the same thing. Higher order functions return a function and usually, the function that is returned has access to variables inside the original function which is what closures is. So yeah different concepts but essentially the same thing

@Psai4456 12 күн бұрын

one guy asked me in interview i told the wrong answer

@AchwaqKhalid Ай бұрын

Dude increase your *FONT* size for tutorials at least 💡

@ahmatmhtlouky4179 12 күн бұрын

Man😂 after each five words you link as to another video 🤦🏽‍♂️

@jasonsworld333 Ай бұрын

Too bad the jobs are all taken lol

@anothermouth7077 Ай бұрын

In Same boat 😂

@manit77 Ай бұрын

This is not true for all programming languages. JavaScript is an anomaly.

@alpaca_growing_kit Ай бұрын

If you work with React you desperately need to understand closures. I have run into some insane React bugs that were created because of closures in complex functional React.

@alpaca_growing_kit Ай бұрын

HINT: Watch out for modifying an onChange when its getting prop drilled. Another reason to create context hooks as often as possible...

@looming_ Ай бұрын

Fact that this dude didn’t mention react once makes me question his understanding. Also the fact he messed up the for loop example.

@zfolwick Ай бұрын

god I hate javascript

@servertimeout8371 20 күн бұрын

no semicolons 😮 you would never get a job from me

@b1studio648 Ай бұрын

Why u move ur head too much? Can you hold your head still while recording or move less. I would appreciate it. The way u move your head makes me dizzy