| 1 | #object-is <sup>[![Version Badge][2]][1]</sup>
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| 2 |
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| 3 | [![Build Status][3]][4]
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| 4 | [![dependency status][5]][6]
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| 5 | [![dev dependency status][7]][8]
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| 6 | [![License][license-image]][license-url]
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| 7 | [![Downloads][downloads-image]][downloads-url]
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| 8 |
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| 9 | [![npm badge][11]][1]
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| 10 |
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| 11 | ES2015-compliant shim for Object.is - differentiates between -0 and +0, and can compare to NaN.
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| 12 |
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| 13 | Essentially, Object.is returns the same value as === - but true for NaN, and false for -0 and +0.
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| 14 |
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| 15 | 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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| 16 |
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| 17 | ## Example
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| 18 |
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| 19 | ```js
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| 20 | Object.is = require('object-is');
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| 21 | var assert = require('assert');
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| 22 |
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| 23 | assert.ok(Object.is());
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| 24 | assert.ok(Object.is(undefined));
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| 25 | assert.ok(Object.is(undefined, undefined));
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| 26 | assert.ok(Object.is(null, null));
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| 27 | assert.ok(Object.is(true, true));
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| 28 | assert.ok(Object.is(false, false));
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| 29 | assert.ok(Object.is('foo', 'foo'));
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| 30 |
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| 31 | var arr = [1, 2];
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| 32 | assert.ok(Object.is(arr, arr));
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| 33 | assert.notOk(Object.is(arr, [1, 2]));
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| 34 |
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| 35 | assert.ok(Object.is(0, 0));
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| 36 | assert.ok(Object.is(-0, -0));
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| 37 | assert.notOk(Object.is(0, -0));
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| 38 |
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| 39 | assert.ok(Object.is(NaN, NaN));
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| 40 | assert.ok(Object.is(Infinity, Infinity));
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| 41 | assert.ok(Object.is(-Infinity, -Infinity));
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| 42 | ```
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| 43 |
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| 44 | ## Tests
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| 45 | Simply clone the repo, `npm install`, and run `npm test`
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| 46 |
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| 47 | [1]: https://npmjs.org/package/object-is
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| 48 | [2]: http://versionbadg.es/es-shims/object-is.svg
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| 49 | [3]: https://travis-ci.org/es-shims/object-is.svg
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| 50 | [4]: https://travis-ci.org/es-shims/object-is
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| 51 | [5]: https://david-dm.org/es-shims/object-is.svg
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| 52 | [6]: https://david-dm.org/es-shims/object-is
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| 53 | [7]: https://david-dm.org/es-shims/object-is/dev-status.svg
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| 54 | [8]: https://david-dm.org/es-shims/object-is#info=devDependencies
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| 55 | [11]: https://nodei.co/npm/object-is.png?downloads=true&stars=true
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| 56 | [license-image]: http://img.shields.io/npm/l/object-is.svg
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| 57 | [license-url]: LICENSE
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| 58 | [downloads-image]: http://img.shields.io/npm/dm/object-is.svg
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| 59 | [downloads-url]: http://npm-stat.com/charts.html?package=object-is
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| 60 |
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