What is the difference between 'var' and 'let' in javascript?

Question

Both seemed having same functionality :/

Answer 1

Let has more limited scope.
E.g. you declare a variable within a function with let keyword.
if you try to use that variable somewhere outside the function you'll get an error saying the variable hasn't been declared.

Answer 2

This has a great explanation of the differences.
https://stackoverflow.com/questions/762011

Answer 3

https://www.sololearn.com/Discuss/1256607/?ref=app
https://www.sololearn.com/Discuss/1248231/?ref=app

Answer 4

var declares a global variable, let declares a variable within a scope e.g. in a function
function sololearn() {
let c="sololearn";
window.alert(c); //outputs sololearn
}
this will work fine but if I use it like:
function sololearn() {
let c="sololearn";
}
alert(c); //outputs undefined
because the variable isn't declared with a global scope.

Answer 5

let is a constant, while var is not