55 lines
1.6 KiB
Markdown
55 lines
1.6 KiB
Markdown
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#object-is <sup>[![Version Badge][2]][1]</sup>
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[![Build Status][3]][4] [![dependency status][5]][6] [![dev dependency status][7]][8]
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[![npm badge][11]][1]
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[![browser support][9]][10]
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ES6-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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## 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://vb.teelaun.ch/ljharb/object-is.svg
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[3]: https://travis-ci.org/ljharb/object-is.svg
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[4]: https://travis-ci.org/ljharb/object-is
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[5]: https://david-dm.org/ljharb/object-is.svg
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[6]: https://david-dm.org/ljharb/object-is
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[7]: https://david-dm.org/ljharb/object-is/dev-status.svg
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[8]: https://david-dm.org/ljharb/object-is#info=devDependencies
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[9]: https://ci.testling.com/ljharb/object-is.png
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[10]: https://ci.testling.com/ljharb/object-is
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[11]: https://nodei.co/npm/object-is.png?downloads=true&stars=true
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