is-nan ^{[![Version Badge][2]][1]}

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ES2015-compliant shim for Number.isNaN - the global isNaN returns false positives.

This package implements the es-shim API interface. It works in an ES3-supported environment and complies with the spec.

Example

``js
Number.isNaN = require('is-nan');
var assert = require('assert');

assert.notOk(Number.isNaN(undefined));
assert.notOk(Number.isNaN(null));
assert.notOk(Number.isNaN(false));
assert.notOk(Number.isNaN(true));
assert.notOk(Number.isNaN(0));
assert.notOk(Number.isNaN(42));
assert.notOk(Number.isNaN(Infinity));
assert.notOk(Number.isNaN(-Infinity));
assert.notOk(Number.isNaN('foo'));
assert.notOk(Number.isNaN(function () {}));
assert.notOk(Number.isNaN([]));
assert.notOk(Number.isNaN({}));

assert.ok(Number.isNaN(NaN));
`

Tests


Simply clone the repo, npm install, and run npm test`

[1]: https://npmjs.org/package/is-nan
[2]: https://versionbadg.es/es-shims/is-nan.svg
[5]: https://david-dm.org/es-shims/is-nan.svg
[6]: https://david-dm.org/es-shims/is-nan
[7]: https://david-dm.org/es-shims/is-nan/dev-status.svg
[8]: https://david-dm.org/es-shims/is-nan#info=devDependencies
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[license-url]: LICENSE
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[downloads-url]: https://npm-stat.com/charts.html?package=is-nan