61 lines
2.3 KiB
Markdown
61 lines
2.3 KiB
Markdown
# object-is <sup>[![Version Badge][npm-version-svg]][package-url]</sup>
|
|
|
|
[![github actions][actions-image]][actions-url]
|
|
[![coverage][codecov-image]][codecov-url]
|
|
[![License][license-image]][license-url]
|
|
[![Downloads][downloads-image]][downloads-url]
|
|
|
|
[![npm badge][npm-badge-png]][package-url]
|
|
|
|
ES2015-compliant shim for Object.is - differentiates between -0 and +0, and can compare to NaN.
|
|
|
|
Essentially, Object.is returns the same value as === - but true for NaN, and false for -0 and +0.
|
|
|
|
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).
|
|
|
|
## Example
|
|
|
|
```js
|
|
Object.is = require('object-is');
|
|
var assert = require('assert');
|
|
|
|
assert.ok(Object.is());
|
|
assert.ok(Object.is(undefined));
|
|
assert.ok(Object.is(undefined, undefined));
|
|
assert.ok(Object.is(null, null));
|
|
assert.ok(Object.is(true, true));
|
|
assert.ok(Object.is(false, false));
|
|
assert.ok(Object.is('foo', 'foo'));
|
|
|
|
var arr = [1, 2];
|
|
assert.ok(Object.is(arr, arr));
|
|
assert.equal(Object.is(arr, [1, 2]), false);
|
|
|
|
assert.ok(Object.is(0, 0));
|
|
assert.ok(Object.is(-0, -0));
|
|
assert.equal(Object.is(0, -0), false);
|
|
|
|
assert.ok(Object.is(NaN, NaN));
|
|
assert.ok(Object.is(Infinity, Infinity));
|
|
assert.ok(Object.is(-Infinity, -Infinity));
|
|
```
|
|
|
|
## Tests
|
|
Simply clone the repo, `npm install`, and run `npm test`
|
|
|
|
[package-url]: https://npmjs.com/package/object-is
|
|
[npm-version-svg]: https://versionbadg.es/es-shims/object-is.svg
|
|
[deps-svg]: https://david-dm.org/es-shims/object-is.svg
|
|
[deps-url]: https://david-dm.org/es-shims/object-is
|
|
[dev-deps-svg]: https://david-dm.org/es-shims/object-is/dev-status.svg
|
|
[dev-deps-url]: https://david-dm.org/es-shims/object-is#info=devDependencies
|
|
[npm-badge-png]: https://nodei.co/npm/object-is.png?downloads=true&stars=true
|
|
[license-image]: https://img.shields.io/npm/l/object-is.svg
|
|
[license-url]: LICENSE
|
|
[downloads-image]: https://img.shields.io/npm/dm/object-is.svg
|
|
[downloads-url]: https://npm-stat.com/charts.html?package=object-is
|
|
[codecov-image]: https://codecov.io/gh/es-shims/object-is/branch/main/graphs/badge.svg
|
|
[codecov-url]: https://app.codecov.io/gh/es-shims/object-is/
|
|
[actions-image]: https://img.shields.io/endpoint?url=https://github-actions-badge-u3jn4tfpocch.runkit.sh/es-shims/object-is
|
|
[actions-url]: https://github.com/es-shims/object-is/actions
|