What’s the difference between variables?

Question

In JavaScript, what’s the difference between “let” and “var” when creating variables? I have heard web developers use them interchangeably.

Thank you all responders!

Answer 1

Let defines a variable inside a block of code so that that variable is not accessible outside of that block. For example:

if (condition){
let a = 3
}
console.log (a) // gives an error because a is not defined outside of if block.

But with var you define a globally accessible variable.

Answer 2

https://code.sololearn.com/WdGAFeNRAe9M/?ref=app

https://code.sololearn.com/Wyr76080kKxS/?ref=app

https://www.sololearn.com/post/91896/?ref=app

https://code.sololearn.com/WKKkpq0efxai/?ref=app

Answer 3

https://code.sololearn.com/WdQOWA45wJyR/?ref=app

Answer 4

among themselves, they differ in scope. Var has a global and let bounded (within a function) for example

Answer 5

Thank you to all who replied to my question! I believe I understand "let" and "var" now.