ES2015-compliant shim for Number.isNaN - the global isNaN returns false positives.
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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.
``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));
`
, 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
[11]: https://nodei.co/npm/is-nan.png?downloads=true&stars=true
[license-image]: https://img.shields.io/npm/l/is-nan.svg
[license-url]: LICENSE
[downloads-image]: https://img.shields.io/npm/dm/is-nan.svg
[downloads-url]: https://npm-stat.com/charts.html?package=is-nan