https://github.com/xotic750/is-nan-x

ES6-compliant shim for Number.isNaN - the global isNaN returns false positives.
https://github.com/xotic750/is-nan-x

browser isnan javascript nodejs number

Last synced: 22 days ago
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ES6-compliant shim for Number.isNaN - the global isNaN returns false positives.

• Host: GitHub
• URL: https://github.com/xotic750/is-nan-x
• Owner: Xotic750
• License: mit
• Created: 2017-09-01T13:54:29.000Z (over 7 years ago)
• Default Branch: master
• Last Pushed: 2023-01-04T21:54:30.000Z (over 2 years ago)
• Last Synced: 2025-04-30T20:31:59.368Z (22 days ago)
• Topics: browser, isnan, javascript, nodejs, number
• Language: JavaScript
• Size: 3.01 MB
• Stars: 0
• Watchers: 1
• Forks: 0
• Open Issues: 21
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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## is-nan-x

ES6-compliant shim for Number.isNaN - the global isNaN returns false positives.



### `module.exports(value)` ⇒ boolean ⏏

This method determines whether the passed value is NaN and its type is

`Number`. It is a more robust version of the original, global isNaN().

**Kind**: Exported function  

**Returns**: boolean - `true` if the given value is NaN and its type is Number;

otherwise, `false`.

| Param | Type            | Description                     |

| ----- | --------------- | ------------------------------- |

| value | \* | The value to be tested for NaN. |

**Example**

```js

import numberIsNaN from 'is-nan-x';

console.log(numberIsNaN(NaN)); // true

console.log(numberIsNaN(Number.NaN)); // true

console.log(numberIsNaN(0 / 0)); // true

// e.g. these would have been true with global isNaN()

console.log(numberIsNaN('NaN')); // false

console.log(numberIsNaN(undefined)); // false

console.log(numberIsNaN({}); // false

console.log(numberIsNaN('blabla')); // false

// These all return false

console.log(numberIsNaN(true));

console.log(numberIsNaN(null));

console.log(numberIsNaN(37));

console.log(numberIsNaN('37'));

console.log(numberIsNaN('37.37'));

console.log(numberIsNaN(''));

console.log(numberIsNaN(' '));

```