What is difference between var and let in JS?

Question

which one most prefer to use
1. var
2. let

Answer 1

finally i am getting that--
=> variable name declared using var can be override but variable name declared using the let keyword doesn't allow us to override the variable name and it throws an error..
=> let is introduce in ES6.
=> var is used in 90s and let is modern approach to declare variable in JS..

Answer 2

https://www.sololearn.com/discuss/763646/?ref=app
https://www.sololearn.com/discuss/1089502/?ref=app
https://www.sololearn.com/discuss/1491784/?ref=app
https://www.sololearn.com/discuss/2535583/?ref=app
https://www.sololearn.com/discuss/1911206/?ref=app
https://www.sololearn.com/discuss/2679485/?ref=app

Answer 3

Var is a global variable, while let is a temporary variable within the code block.