| # number-is-nan [](https://travis-ci.org/sindresorhus/number-is-nan) | 
 |  | 
 | > ES2015 [`Number.isNaN()`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number/isNaN) [ponyfill](https://ponyfill.com) | 
 |  | 
 |  | 
 | ## Install | 
 |  | 
 | ``` | 
 | $ npm install --save number-is-nan | 
 | ``` | 
 |  | 
 |  | 
 | ## Usage | 
 |  | 
 | ```js | 
 | var numberIsNan = require('number-is-nan'); | 
 |  | 
 | numberIsNan(NaN); | 
 | //=> true | 
 |  | 
 | numberIsNan('unicorn'); | 
 | //=> false | 
 | ``` | 
 |  | 
 |  | 
 | ## License | 
 |  | 
 | MIT © [Sindre Sorhus](http://sindresorhus.com) |