JavaScript ES6 / ES2015 - [03] Let and Const Declaration

In this video Ill show you how to start using the let and const declaration for setting variables and constants

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[ParasBansal]

4:14 "We get an error. That was not supposed to happen". I want this on a T-shirt.

[TheologicalQuest]

Thank you for the videos on ES6. This was very helpful in understanding Let. I liked it enough that I went over to Udemy and bought your new JavaScript Course : )

[neetishraj]

use [ctrl + / ], to comment any selected lines in atom
best use case when studying js, u write many small test functions in js, which u might need to study again, hence my fav
select all [ ctrl + A ]
comment [ ctrl + / ],
atom changed my life

[rafaeljm]

is const the same as let in general/block level scope? Can i define an array as const outside a loop, for example, and push values into it only inside the loop?

[mrvzhao]

That WIX advertisement is depressing to watch under this context, because it makes me feel like whatever I've learnt here won't matter. "You need a website? Why not build it yourself (with our AI designer, instead of hiring a "pricey" human)?"

[TT-udgf]

Now that we have 'let', do you recommend we stop using 'var' for all future work?

[michaelguest]

Hello Keep up the good work! I was wondering should i use sublime or atom?

[nitinkumar_nagamalla]

let x = [];
console.log(x);
x = []; // throws error....

So it is assignment to a const is throwing error. Even if its the same thing we are assigning.

Conclusion: Assignment to a const should be only once.

Correct me if I am wrong.

[kondasomu]

hi sir,

I have code like this
let a= { name:"scott"};
a.name = "john";
console.log(a);
now name is john. If I use const keyword we are changing 'a' value. How we can prevent the changing of value.

[JD-srdm]

I have one doubt in const.. if we declare variable with const we wont be able to change the value then why am i able to pop the value from const array.. Please provide the clarification..

[kalaiselvam]

Hiii bro
Small doubt
Exapmle: const numOne=5;
Const numTwo= 6;
Console.log (numOne > numTwo)
Tell me answer bro

[micycle]

Is it good idea to assign constants to mutable objects? Isn't the entire idea of a constant that it's... constant?

[mohsenmadi]

What is the reason for having to "scripts"? So, when we run a "npm run build", which one is executed?

[pizza]

this is what i needed, was finding them difficult to understand why people use let and what is const etc...

[proevilz]

Well, I'm confused with let. I thought the scope worked fine, with let it's the opposite for me.

[groovebird]

Why should I use the same variable name in different scopes? For me it seems a little bit confusing and the code is not so clear.

[JeremyGalloway]

let and const screw up "this" binding as well. If you say something like

var a = 5;
function logMe() {console.log(this.a)};
logMe();

in the old syntax, this would work and log 5. But if you try declaring the variable with let or const, it returns undefined. I get why ES6 is technically better, but differences like this are annoying

[medi]

in the global scope let and const aren't the same!
you can repeatedly declare the same variable in the same scope as much as you want using "var" keyword, BUT you can't do that using "let". you are too far from knowing what you are doing. you haven't mentioned anything about enclosing scopes nor execution contexts. and about const means it doesn't allow a new assignment but you can change the whole content of the array by pushing or popping what's in there.

[kodieivie]

cant concentrate with your keyboard crunching in my ears..