In JavaScript what is the difference between let and the var keywords

Answer 1

let is private declaration, which it wont be seen on other functions or blocks

var is public declaration, so you can access it everywhere in that code.

Answer 2

Var :
1. Old
2. Function scoped
3. Hoisted
4. In global scope its added to window/global object.
5. supports redeclaaration

Let:
1. Newer came in 2015 (ES6)
2. Block scoped
3. Not hoisted
4. Its not added like var to global objects
5. throws error during redeclaration

2 and 3 are important to know, hoisting being a bit confusing but explained in code below

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

https://code.sololearn.com/WiHHHOb3qp8W/?ref=app
Answer credits to : Morpheus

Answer 3

https://www.sololearn.com/learn/JavaScript/2969/