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javascript/snippets/is-negative-zero.md

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+---
+title: Number is negative zero
+type: snippet
+tags: [math]
+cover: flower-portrait-8
+dateModified: 2020-10-20T23:02:01+03:00
+---
+
+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`.
+
+```js
+const isNegativeZero = val => val === 0 && 1 / val === -Infinity;
+```
+
+```js
+isNegativeZero(-0); // true
+isNegativeZero(0); // false
+```