| redeclare | reassign | scope | initialize | |
|---|---|---|---|---|
| let | ⛔ | ✅ | 🗳 block | ⛔ |
| const | ⛔ | ⛔ | 🗳 block | ⛔ |
| var | ✅ | ✅ | function | "undefined" |
💎 const
the word const comes from constant, so it shouldn't change at all.
- redeclare -> NO❗
- reassign -> NO❗
- scope -> block! We protect const in block !!
- initialize -> of course NO❗
💎 let
let is actually almost const except one thing
- reassign -> OK ✅
💎 var
var is so much freedom man, it's not recommended now
▼ and difference of hoisting, I've wrote about it in other article
