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105 lines
3.3 KiB
105 lines
3.3 KiB
# array-includes <sup>[![Version Badge][npm-version-svg]][package-url]</sup> |
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[![github actions][actions-image]][actions-url] |
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[![coverage][codecov-image]][codecov-url] |
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[![dependency status][deps-svg]][deps-url] |
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[![dev dependency status][dev-deps-svg]][dev-deps-url] |
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[![License][license-image]][license-url] |
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[![Downloads][downloads-image]][downloads-url] |
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[![npm badge][npm-badge-png]][package-url] |
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An ES7/ES2016 spec-compliant `Array.prototype.includes` shim/polyfill/replacement that works as far down as ES3. |
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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 proposed [spec](https://262.ecma-international.org/6.0/). |
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Because `Array.prototype.includes` depends on a receiver (the `this` value), the main export takes the array to operate on as the first argument. |
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Engines that need this package include: |
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- IE (all versions) |
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- Safari < 9 |
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- Firefox < 43, and 99+ |
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- Chrome < 47 |
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- Edge < 14 |
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- node < 6 |
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## Getting started |
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```sh |
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npm install --save array-includes |
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``` |
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## Usage |
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Basic usage: **includes(array, value[, fromIndex=0])** |
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```js |
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var includes = require('array-includes'); |
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var assert = require('assert'); |
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var arr = [ 'one', 'two' ]; |
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includes(arr, 'one'); // true |
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includes(arr, 'three'); // false |
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includes(arr, 'one', 1); // false |
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``` |
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## Example |
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```js |
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var arr = [ |
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1, |
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'foo', |
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NaN, |
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-0 |
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]; |
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assert.equal(arr.indexOf(0) > -1, true); |
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assert.equal(arr.indexOf(-0) > -1, true); |
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assert.equal(includes(arr, 0), true); |
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assert.equal(includes(arr, -0), true); |
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assert.equal(arr.indexOf(NaN) > -1, false); |
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assert.equal(includes(arr, NaN), true); |
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assert.equal(includes(arr, 'foo', 0), true); |
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assert.equal(includes(arr, 'foo', 1), true); |
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assert.equal(includes(arr, 'foo', 2), false); |
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``` |
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```js |
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/* when Array#includes is not present */ |
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delete Array.prototype.includes; |
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var shimmedIncludes = includes.shim(); |
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assert.equal(shimmedIncludes, includes.getPolyfill()); |
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assert.equal(arr.includes('foo', 1), includes(arr, 'foo', 1)); |
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``` |
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```js |
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/* when Array#includes is present */ |
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var shimmedIncludes = includes.shim(); |
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assert.equal(shimmedIncludes, Array.prototype.includes); |
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assert.equal(arr.includes(1, 'foo'), includes(arr, 1, 'foo')); |
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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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[package-url]: https://npmjs.org/package/array-includes |
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[npm-version-svg]: https://versionbadg.es/es-shims/array-includes.svg |
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[deps-svg]: https://david-dm.org/es-shims/array-includes.svg |
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[deps-url]: https://david-dm.org/es-shims/array-includes |
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[dev-deps-svg]: https://david-dm.org/es-shims/array-includes/dev-status.svg |
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[dev-deps-url]: https://david-dm.org/es-shims/array-includes#info=devDependencies |
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[npm-badge-png]: https://nodei.co/npm/array-includes.png?downloads=true&stars=true |
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[license-image]: https://img.shields.io/npm/l/array-includes.svg |
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[license-url]: LICENSE |
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[downloads-image]: https://img.shields.io/npm/dm/array-includes.svg |
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[downloads-url]: https://npm-stat.com/charts.html?package=array-includes |
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[codecov-image]: https://codecov.io/gh/es-shims/array-includes/branch/main/graphs/badge.svg |
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[codecov-url]: https://app.codecov.io/gh/es-shims/array-includes/ |
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[actions-image]: https://img.shields.io/endpoint?url=https://github-actions-badge-u3jn4tfpocch.runkit.sh/es-shims/array-includes |
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[actions-url]: https://github.com/es-shims/array-includes/actions
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