is-nan-x
v2.1.1
ES6-compliant shim for Number.isNaN - the global isNaN returns false positives.
6.3K/weekUpdated 3 years agoMITUnpacked: 31.0 KB
Published by Graham Fairweather
npm install is-nan-x
title="Travis status">
alt="Travis status" height="18">
title="Dependency status">
alt="Dependency status" height="18"/>
title="devDependency status">
alt="devDependency status" height="18"/>
title="npm version">
alt="npm version" height="18">
title="jsDelivr hits"> alt="jsDelivr hits" height="18">
title="bettercodehub score"> alt="bettercodehub score" height="18">
title="Coverage Status">
alt="Coverage Status" height="18">
is-nan-x
ES6-compliant shim for Number.isNaN - the global isNaN returns false positives.
$3
This method determines whether the passed value is NaN and its type isNumber. 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(' '));
``