# JS syntax - variables
[[JS Syntax]]
### variables
local variable - only initialized when evaluated
```js
let n;
let number = 1;
let numbers = [1,2,3];
```
global variable
```js
var number
var number = 1
```
global constant
```js
const number = 1
const func = () => {
let a = 1;
let b = 2;
return a+b
}
```