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