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Update isNegativeZero.md

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Angelos Chalaris
2018-11-21 19:20:08 +02:00
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### isNegativeZero
Checks if the given value is a negative zero `-0`.
Checks if the given value is equal to negative zero (`-0`).
Checks whether a passed value is equal to `0` and if one devided by the value equals `-Infinity`.
Checks whether a passed value is equal to `0` and if `1` divided by the value equals `-Infinity`.
```js
const isNegativeZero = val => val === 0 && 1 / val === -Infinity;