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50 lines
1.7 KiB
50 lines
1.7 KiB
1 year ago
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# is-nan <sup>[![Version Badge][2]][1]</sup>
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[![dependency status][5]][6]
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[![dev dependency status][7]][8]
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[![License][license-image]][license-url]
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[![Downloads][downloads-image]][downloads-url]
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[![npm badge][11]][1]
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ES2015-compliant shim for Number.isNaN - the global isNaN returns false positives.
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This package implements the [es-shim API](https://github.com/es-shims/api) interface. It works in an ES3-supported environment and complies with the [spec](http://www.ecma-international.org/ecma-262/6.0/#sec-number.isnan).
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## Example
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```js
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Number.isNaN = require('is-nan');
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var assert = require('assert');
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assert.notOk(Number.isNaN(undefined));
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assert.notOk(Number.isNaN(null));
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assert.notOk(Number.isNaN(false));
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assert.notOk(Number.isNaN(true));
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assert.notOk(Number.isNaN(0));
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assert.notOk(Number.isNaN(42));
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assert.notOk(Number.isNaN(Infinity));
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assert.notOk(Number.isNaN(-Infinity));
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assert.notOk(Number.isNaN('foo'));
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assert.notOk(Number.isNaN(function () {}));
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assert.notOk(Number.isNaN([]));
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assert.notOk(Number.isNaN({}));
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assert.ok(Number.isNaN(NaN));
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```
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## Tests
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Simply clone the repo, `npm install`, and run `npm test`
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[1]: https://npmjs.org/package/is-nan
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[2]: https://versionbadg.es/es-shims/is-nan.svg
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[5]: https://david-dm.org/es-shims/is-nan.svg
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[6]: https://david-dm.org/es-shims/is-nan
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[7]: https://david-dm.org/es-shims/is-nan/dev-status.svg
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[8]: https://david-dm.org/es-shims/is-nan#info=devDependencies
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[11]: https://nodei.co/npm/is-nan.png?downloads=true&stars=true
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[license-image]: https://img.shields.io/npm/l/is-nan.svg
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[license-url]: LICENSE
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[downloads-image]: https://img.shields.io/npm/dm/is-nan.svg
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[downloads-url]: https://npm-stat.com/charts.html?package=is-nan
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