JarCasting 
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
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(' '));