https://github.com/es-shims/object-is

ES6-compliant shim for Object.is - differentiates between -0 and +0, and can compare to NaN.
https://github.com/es-shims/object-is

Last synced: about 1 month ago
JSON representation

ES6-compliant shim for Object.is - differentiates between -0 and +0, and can compare to NaN.

• Host: GitHub
• URL: https://github.com/es-shims/object-is
• Owner: es-shims
• License: mit
• Created: 2014-02-18T06:06:05.000Z (over 10 years ago)
• Default Branch: main
• Last Pushed: 2024-02-28T00:02:55.000Z (4 months ago)
• Last Synced: 2024-05-09T09:56:59.852Z (about 2 months ago)
• Language: JavaScript
• Size: 141 KB
• Stars: 25
• Watchers: 4
• Forks: 8
• Open Issues: 1
• Metadata Files:
  • Readme: README.md
  • Changelog: CHANGELOG.md
  • License: LICENSE

Lists

• awesome-ponyfills - object-is - [`Object.is`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/is) (Objects)

README

        
# object-is [![Version Badge][npm-version-svg]][package-url]

[![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