Differences Between Var, Let, and Const

[@ianoliver6828]

You have a super rare skill. It's rare to find someone who is both a skilled programmer AND a skilled teacher / communicator. Thank you for your videos

[@olegfare4625]

and Zach Efron level of handsome

[@sclutzo]

Totally agree!

[@samanthawu1637]

I second this!

[@Peace-bt7mb]

True. I know lots of really great skilled programmers but they don't really know how to explain it to a beginner

[@camilafloressanhueza7966]

OMG!! I had seen 100000 videos whose explanations were extremely complicated, but you explained it in less than 5 minutes!! Thank you very much

[@GoogleAccount-jw1rd]

And understandable

[@Max-nm8ct]

Mate, I must say, your hair is on fleek!

[@TheSlimSh4dy]

Thank you for the clear explanation! Currently, I'm learning HTML, CSS & Javascript and if I don't understand something, I'm firstly looking at your channel to find an explanation. If it doesn't exist on your channel, then I'm searching in other sources. You are a very good teacher, your videos are short, consistent and very clear, without any unnecessary content. Thank you very much for sharing your time to make these videos.

[@AlexTechie]

6:36 I didn't know that. This is why I always watch your videos, even if I think I understand the subject before hand. Great work! 👍

[@WebDevSimplified]

It is a bit counter intuitive based on the name. You can use Object.freeze to create an object that cannot have the properties reassigned, but it will still let you reassign a nested property such as company.ceo.name = 'New name'

[@AlexTechie]

@@WebDevSimplified thanks for the tip! As I was watching the part I referenced earlier, I was wondering how we would assign constants to the properties of an object, so it's like you read my mind. :D

[@dorothyglade9087]

This was great, you speak at just the right speed and your voice is clear. This really helped me and my husband with something in our bootcamp.

[@michaelmaloy6378]

Whenever I see that face, I know useful information is coming my way. Simple, clear, and very helpful. Thank you as always!

[@LeHuffy]

This video came just in time. We are going through Javascript and JQuery right now in my bootcamp!

[@WebDevSimplified]

I'm really glad to hear. If you run into anything that confuses you in the bootcamp feel free to let me know, and I can try to help or make a video on the topic.

[@LeHuffy]

@@WebDevSimplified Awesome will do!

[@tonic.9234]

I never knew var worked like this, and I've been using Javascript almost daily for over 2 years. I always assumed it worked like let because I have a background in other programming languages and assumed it's scoping worked the same. So wild! Thanks for the clarification!

[@sagarioharvey6910]

Web dev here in the PH. "Man I love your videos, your making a great impact" //awesome

[@dozadetrezire7455]

You forgot to say one more thing: when you declare a variable with var keyowrd, this automatically creates a property inside the Window ojbject.. so, if you say for example: var x = 1; and after that you say: console.log(window)... you will see that in the window object you will find the property X with the value of 1. Instead, if you declare a variable with let or const, this won't ceate a property inside the Window object. I guess this was also very important to mention!

[@dsvhs93]

Whenever Kyle comes out with the JavaScript class that he is working on.... I am purchasing it. He is awesome! Thank you Kyle!

[@WebDevSimplified]

Thank you for the support! I start recordikg tomorrow!

[@jthomasaurus]

Another super-clear explanation. Love your video style, brevity, and way of explaining everything. Plain and simple!

[@AidanJoyce]

Would like to say, well done and thank you for a clear and concise explanation of the similarities, differences and when to use, Var, Const and Let. Watched other videos and without doubt, you nail it better here with both explanation and example. Will be watching more of your stuff as this was a great measure stick for the quality of teaching. Keep up the great work.

[@pratikthorat3480]

This is the best explanation I've ever seen. I do know the differences yet I learnt something new

[@derrick3534]

man you are teaching the things that are not widely discussed which is why i am going to subscribe. You have a true gift of teaching in simple terms. i enjoy your channel, especially the tutorial on promises

[@WebDevSimplified]

Thank you! I try to cover the topics that I know confused me or other people I know, because those will be the most helpful for others.

[@theNikijspictures]

Really good explanation, for beginner level - if reading info only in text (with no visual examples), it gets confusing quickly on this topic. Cheers😉

[@moonlightCR7]

Thanks a billion, Kyle for explaining the difference among these keywords.

[@gqntexas]

Great great explanation.. you always here that the differences is the 'block scope' and then wonder, well, like within an if or for loop, but nobody else ever says that...

[@rohit9969171579]

It was very crystal clear explanation thank you.

[@dacfniel5442]

You are the best teacher on KZbin.

[@samanthawu1637]

You were born to teach! Awesome!

[@raaghavendrahm4883]

I am just starting with JS and I was stuck with this like hell. You made it so clear. Thanks a lot!!

[@therealbrucewayne24]

Yes I did learn something thank you very much man it was hard for me to understand this but you explained it in like less than 10 minutes lol you have a good day too :)

[@pooja6380]

learn so much important points and the actual difference ....thanks a lot

[@videospromoter5884]

Checked 10s of video and this video told me hmm you understand this now . say thanks to him :) Thanks Dude

[@injector6926]

Best Web Development I seen evrr

[@sandybathwater8385]

So simple, thank you so much! If I search for something and see your face in the results, I am saved. :)

[@santra528]

This is complete explanation of let vs const vs var I have ever seen. Thanks Kyle 😊

[@thecoderabbi]

Thank you very much Kyle, This is great. Very explicit. I think I would begin using the 'const' instead of the 'var' Thanks ✌️

[@jahneychriast2141]

தெளிவான விழக்கம் நன்றி 🙏🏽

[@manojbharadwaj456]

That's so motivating. Because nobody understood that!

[@rajlakshmijoshi]

Thnks for the detailed vid, just one correction: At 5:35-> const does not allow to 're-declare' the variable, actually should be const does not allow to 're-assign' the variable, but let do.

[@jorgefrias7889]

Amazing explanation. Simple and straight to the point. Thank you!

[@coderbhai4832]

1)Declaration Let variable in a {} block scope can't be access outside of it 2)let name = value1, let name = value2, can't redeclare let twice Instead of this should be written name=value2; 3)let can be change it’s value const can't as it is constant but it can change its object value.🙃

[@chalk1007]

yeah, I was a little confused aswell but this video was made in 2018

[@dozadetrezire7455]

You forgot to say one more thing: when you declare a variable with var keyowrd, this automatically creates a property inside the Window ojbject.. so, if you say for example: var x = 1; and after that you say: console.log(window)... you will see that in the window object you will find the property X with the value of 1. Instead, if you declare a variable with let or const, this won't ceate a property inside the Window object. I guess this was also very important to mention!

[@borislavaborisova7274]

Thank you! This video was very helpful. Just what I needed.

[@ImHansana123]

The good old days when we didn't have chatgpt.❤️

[@WebDevJapan]

lol true, but I like seeing a human explain it sometimes. Even though I can get quick answers from Professor GPT, I've made it a habit to watch one short intructional video like this everyday.

[@nessparadis6948]

Great video. Succinct, clear to understand, and I learned a lot. Thank you.

[@bujjivenkateshwarlu6942]

Hey thanks. earlier i had confusion about block scope and Function scope. Now its cleared.

[@aisana99]

thank you :D you shared more differences than my constructor in my Full-Stack Bootcamp! Will subscribe and watch all other videos of yours

[@stuartgreen5217]

Been building sites for 30 years and always avoided JS due to pre jquery experience. Am now taking the time to relearn JS and node while I’m at it and I have to say I’m regretting not doing this sooner. I’ve been programming in C# php Perl VB and JS is a peace of cake by comparison .

[@khaktus]

While I prefer Kyle's tutorials over the others for various reasons (extent > clarity > simplicity), for this one I'll differ from the praise-storm below - this was just one of the many confusing explanation of the var|let|const topic that I've seen so far. This is the problem that many skilled developers have - they assume that as developers they have analytical thinking and provide well structured explanations (naturally, by default) - but I have seen - since the university times to professional days - that the paradoxical situation happens: techies often do the exact opposite: they do not adhere to the structure/hierarchy of the topic, nor the consistent use of terms they set in the beginning. :D Something to work on throughout professional life. In first part, you repeatedly state that var does and let does not allow to redeclare the variable, then you say the difference between let and const is that const does not allow to redeclare the variable. That paused my brain, while explanations went on. Maybe stating more clearly what is the difference between (your use of) "redeclare" and "redefine" and "reset" and "reassign" ... would help. Particularly in this one topic. :) I'd welcome more "technical" "analytical" (or tabular ;) ) than the "narrative" approach here. And particularly a consistent use of terms. 1 minute: redeclare: var|let|const myThingy = 10 var|let|const myThingy = 20 redefine/reassign/reset variable value: var|let|const myThingy = 10 myThingy=20 redefine object|array items value (not object|array value, which is just its memory address, so that remains "constant"): var|let|const myObject = [10, 11]; myObject[0] = 20 1 minute: | redeclare| reassign value of variable | reassign value of item in the array or property in the object| ------------------------------------------------------------------------------------------------------------------------------------------------------------ var yes yes yes let no yes yes const no no yes Also, from the many lessons on the scope, I understood that "scope" is something defining on what level of nesting we are (regardless if it is a function or block or just anything between {}). This perspective was often emphasized. Here, for the first time, I hear that different scope is actually defined by either function or block. Good point here!

[@nowhererealm]

dude yes! I was wondering how the heck are there so many people praising the explanation when i couldnt understand why he said let cant redefine a variable then goes on and says thats the only difference between const and let?? lmao wtf

[@bozok1903]

Very clear explanation. Thank you for that.

[@rickneibauer1]

I can't move on until i know why something works unless i ABSOLUTELY have to. thanks to you i can move toward the light. goodbye everyone...

[@tiltify2393]

finally I understand the difference, thanks man A LOT

[@itsshafayat6378]

someone get this absolute master a stellar coding setup i.e a better keyboard

[@sadhappy8860]

Super clear explanation, many thanks

[@EyeIn_The_Sky]

Good old Java script, Let (no pun intended) us introduce "const" that does not allow for re-assigning to avoid human error so that it is "constant" except when it's not...

[@СашаТюменцев-ш9ь]

huge thanks for the explanation, only you made it clear to me!

[@JEffinger]

Thank's bro that was a really clear explanation.

[@baliyachtservices7505]

I was wondering just that! Thanks so much

[@somtovitus]

Best video on this topic

[@nobitalazy9791]

you are a rare gem my friend!!!

[@khisus20]

This is truly simplified

[@ev_dash]

Your videos are helping me out alot! Thank you ❤

[@Trauma_Clown]

I need a video that of explaining who these Bob and Sally are, you're using them everywhere :3 Im curious af for real

[@wr1818]

thankyou for all the amazing explaining!

[@derickbank1064]

Thank you for the explanation. Well explained. !

[@guillaumedupont2902]

This was SO helpful. Thank you so much!

[@JonasGavenas]

Great lesson! Thank you, perfect explain.

[@weligamage1]

Clear and concise, Thank you

[@kazeemalatishe3828]

Thanks a lot. You explain things really well.

[@mirceahanghiuc4447]

A nice topic can be this : function justA(){ a = 1; } justA(); console.log(a); // 1

[@mayorb37]

You make a wonderful work 👍👍👍👍👍 thanks

[@xilliman]

im declaring every variable as const and then change it to let if i have to reassign them. this makes the code much safer. i don’t use var anymore

[@monireachtang712]

very clear explanation! you are awesome!

[@Peace-bt7mb]

Is var is a global variable and let and const are local variables? Also, Does Block scoped means a local variable and fn scoped means global variable? I am a beginner, Knows only C++ and Python

[@aadityakiran_s]

I came from C#. Use var for what you want to change, const for what you don't; variable and constant. Simple language for simple people.

[@Peace-bt7mb]

True bro

[@vikumravinayake1882]

Problem solved Thank you very much. Ur a good explainer....

[@oceanmind1793]

You made it so clear. Thanks a lot

[@hoakeen]

Awesome tutorials! Thank you!

[@priyanshugupta7614]

thank you your explanation was very clear

[@ruslankovalov8292]

Thanks God we have you to explain this!! thanks!! A lot! A mean that)

[@kamalsyed4237]

loved it! Thanks.. Const, Let, Var .. it is :)

[@pashashyba5006]

Quite easy to understand. Thanks

[@NashBrooklyn]

wait up! const also allows to assign value outside of block - as many times you would need to assign such value that cannot be changed by hackers - for instance a waiting time to acept a trip request must be 1 minute only - so if a hacker wishes to change that to 60 minutes - const will not let that to happen - const is great to use in many solid inflexible math routines - that can happen all over the code - so if you set the earth radius to its value as per books - then using const will assure it wont be changed by any accidents or bugs in code -

[@shresthsrivastava27]

Awesome explanation !

[@andreas-wismann]

Great! Suggested topic while you're at it: Semicolons in JS - use or omit?

[@jankiramulu]

Wonderful explanation.. Than you....

[@quickmaths4762]

5:35 is wrong no? you say const does not allow you to redeclare a variable. But you meant reassign right? (redeclare is also forbidden with let...)

[@NedumEze]

I love your approach so much. Thank you. I do have a fundamental problem though. Maybe you can consider making video of it. It is this: When I create an external JS file, and I have in it, codes like functions, etc in it, only the first code or function works! What should I do to ensure that different codes intended to fire at different Listeners, in the same file, work?

[@kushagraraj3163]

you r jordi of webdev !!!!!!!

[@agaming7888]

thanks for this now i know what to do 👍👍👍👍

[@alex_blue5802]

I used to see people saying that you should use const only if you have a specific need for a variable to remain constant. Nowadays it seems like people always want to use const as a default and I don't like that as much.

[@akashmadanu3994]

Skip Intro : 0:41

[@halofreak644]

You the real MVP

[@SumitSinghrao]

Could you also explain if we declare a variable without var, let and const? Could you also make video on 'this' keyword.

[@mirzashowvik564]

Great video !!! Love it

[@Garentei]

I think const shouldn't let you modify anything... smh at JS consistency. Great video!

[@robertoriosmorales7528]

awesome explanation

[@RakeshBitling]

can you please cover topic related to redis cache along with aws

[@hanntongfong1226]

Great work! 👍

[@ihaseeb_khan]

Thank you bro, really helpful :)

[@FredRosa]

Great tutorial, thanks!

[@minercreepmc]

Love your channel

[@ЕдвардГригорян-н6к]

great explanation. TY!

[@upcom1ng116]

For those who get an error "SyntaxError: Identifier 'letVariable' has already been declared" Look for another video "var, let and const for beginners (ES6)"

[@LUCCCAS_A]

fire video bro!!11!!!1! 🔥🔥🔥

[@RS-nz6rn]

Thanks for clarifying.

[@jimilittle]

That was awesome. Thank you

[@namratadas5569]

Grt video... can you make videos on concepts such as closures,iffis,apply,call,bind methods...etc?