20 lines
435 B
Markdown
20 lines
435 B
Markdown
---
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title: isNegativeZero
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tags: math,intermediate
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firstSeen: 2018-11-12T15:45:36+02:00
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lastUpdated: 2020-10-20T23:02:01+03:00
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---
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Checks if the given value is equal to negative zero (`-0`).
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- Check whether a passed value is equal to `0` and if `1` divided by the value equals `-Infinity`.
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```js
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const isNegativeZero = val => val === 0 && 1 / val === -Infinity;
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```
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```js
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isNegativeZero(-0); // true
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isNegativeZero(0); // false
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```
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