---
id: 1accac75-7a5c-4847-977a-f0ae63454820
title: JavaScript Math library
---

# ES6

## .sign(x)

### Returns

-   -1 if x is a negative number (including -Infinity).
-   0 if x is zero4.
-   +1 if x is a positive number (including Infinity).
-   NaN if x is NaN or not a number.

``` javascript
console.log(Math.sign(-8)) // -a
console.log(Math.sign(3)) // 1
console.log(Math.sign(0)) // 0
console.log(Math.sign(NaN)) // NaN
console.log(Math.sign(-Infinity)) // -1
console.log(Math.sign(Infinity)) // 1
```

## .trunc(x)

``` javascript
console.log(Math.trunc(3.1)) // 3
console.log(Math.trunc(3.9)) // 3
console.log(Math.trunc(-3.1)) // 3
console.log(Math.trunc(-3.9)) // 3
```

## .cbrt(x)

Returns the cube root of x:

``` javascript
console.log(Math.cbrt(8)) // 2
console.log(Math.cbrt(27)) // 3
```