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60 lines
2.0 KiB
60 lines
2.0 KiB
#object-is <sup>[![Version Badge][2]][1]</sup>
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[![Build Status][3]][4]
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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 Object.is - differentiates between -0 and +0, and can compare to NaN.
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Essentially, Object.is returns the same value as === - but true for NaN, and false for -0 and +0.
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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](https://tc39.es/ecma262).
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## Example
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```js
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Object.is = require('object-is');
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var assert = require('assert');
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assert.ok(Object.is());
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assert.ok(Object.is(undefined));
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assert.ok(Object.is(undefined, undefined));
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assert.ok(Object.is(null, null));
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assert.ok(Object.is(true, true));
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assert.ok(Object.is(false, false));
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assert.ok(Object.is('foo', 'foo'));
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var arr = [1, 2];
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assert.ok(Object.is(arr, arr));
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assert.notOk(Object.is(arr, [1, 2]));
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assert.ok(Object.is(0, 0));
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assert.ok(Object.is(-0, -0));
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assert.notOk(Object.is(0, -0));
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assert.ok(Object.is(NaN, NaN));
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assert.ok(Object.is(Infinity, Infinity));
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assert.ok(Object.is(-Infinity, -Infinity));
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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/object-is
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[2]: http://versionbadg.es/es-shims/object-is.svg
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[3]: https://travis-ci.org/es-shims/object-is.svg
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[4]: https://travis-ci.org/es-shims/object-is
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[5]: https://david-dm.org/es-shims/object-is.svg
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[6]: https://david-dm.org/es-shims/object-is
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[7]: https://david-dm.org/es-shims/object-is/dev-status.svg
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[8]: https://david-dm.org/es-shims/object-is#info=devDependencies
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[11]: https://nodei.co/npm/object-is.png?downloads=true&stars=true
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[license-image]: http://img.shields.io/npm/l/object-is.svg
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[license-url]: LICENSE
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[downloads-image]: http://img.shields.io/npm/dm/object-is.svg
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[downloads-url]: http://npm-stat.com/charts.html?package=object-is
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