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