Differences Between Var, Let, and Const

You have probably watched many different tutorials, and you may have noticed that some tutorials use var to declare variables while others use let or even const. It can get confusing quickly on what the differences are between the keywords, so in this video I am going to be explaining everything you need to know about var, let, and const. I will be going over their differences as well as explaining what situations you should use each keyword.

If you have any suggestions for a JavaScript topic, please let me know in the comments below.

Let vs Const vs Var Article:

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[ianoliver]

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

[camilafloressanhueza]

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

[Max-nmct]

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

[dozadetrezire]

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!

[jthomasaurus]

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

[TheSlimShdy]

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.

[dorothyglade]

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.

[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! 👍

[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.

[pratikthorat]

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

[tonic.]

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!

[santra]

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

[raaghavendrahm]

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

[rohit]

It was very crystal clear explanation thank you.

[youareuglybuti]

Thank you man, was struggling to understand these basic concepts. You are a lifesaver.

[BASTMDE]

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

[thecoderabbi]

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

[dsvhs]

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

[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...

[moonlightCR]

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