# Number is negative zero

JavaScript, Math · Oct 20, 2020

Checks if the given value is equal to negative zero (`-0`

).

- Check whether a passed value is equal to
`0`

and if`1`

divided by the value equals`-Infinity`

.

`const isNegativeZero = val => val === 0 && 1 / val === -Infinity;`

```
isNegativeZero(-0); // true
isNegativeZero(0); // false
```