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array.prototype.indexof \u003csup\u003e[![Version Badge][npm-version-svg]][package-url]\u003c/sup\u003e\n\n[![github actions][actions-image]][actions-url]\n[![coverage][codecov-image]][codecov-url]\n[![dependency status][deps-svg]][deps-url]\n[![dev dependency status][dev-deps-svg]][dev-deps-url]\n[![License][license-image]][license-url]\n[![Downloads][downloads-image]][downloads-url]\n\n[![npm badge][npm-badge-png]][package-url]\n\nAn ES2015 spec-compliant `Array.prototype.indexof` shim/polyfill/replacement that works as far down as ES3.\n\nThis 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://www.ecma-international.org/ecma-262/6.0/).\n\nBecause `Array.prototype.indexOf` depends on a receiver (the “this” value), the main export takes the array to operate on as the first argument.\n\n## Example\n\n```js\nvar indexOf = require('array.prototype.indexof');\nvar assert = require('assert');\n\nassert.equal(indexOf([1, 2, 3], 2), 1);\nassert.equal(indexOf([1, 0, 1], 1), 0);\nassert.equal(indexOf([1, 2, 3], 4), -1);\nassert.equal(indexOf([NaN], NaN), -1);\n```\n\n```js\nvar indexOf = require('array.prototype.indexof');\nvar assert = require('assert');\n/* when Array#indexOf is not present */\ndelete Array.prototype.indexOf;\nvar shimmedMap = indexOf.shim();\nassert.equal(shimmedMap, indexOf.getPolyfill());\nassert.equal([1, 2, 3].indexOf(2), 1);\nassert.equal([1, 0, 1].indexOf(1), 0);\nassert.equal([1, 2, 3].indexOf(4), -1);\nassert.equal([NaN].indexOf(NaN), -1);\n```\n\n```js\nvar indexOf = require('array.prototype.indexof');\nvar assert = require('assert');\n/* when Array#indexOf is present */\nvar shimmedMap = indexOf.shim();\nassert.equal(shimmedMap, Array.prototype.indexOf);\nassert.equal([1, 2, 3].indexOf(2), 1);\n```\n\n## Tests\nSimply clone the repo, `npm install`, and run `npm test`\n\n[package-url]: https://npmjs.org/package/array.prototype.indexof\n[npm-version-svg]: https://versionbadg.es/es-shims/Array.prototype.indexOf.svg\n[deps-svg]: https://david-dm.org/es-shims/Array.prototype.indexOf.svg\n[deps-url]: https://david-dm.org/es-shims/Array.prototype.indexOf\n[dev-deps-svg]: https://david-dm.org/es-shims/Array.prototype.indexOf/dev-status.svg\n[dev-deps-url]: https://david-dm.org/es-shims/Array.prototype.indexOf#info=devDependencies\n[npm-badge-png]: https://nodei.co/npm/array.prototype.indexof.png?downloads=true\u0026stars=true\n[license-image]: https://img.shields.io/npm/l/array.prototype.indexof.svg\n[license-url]: LICENSE\n[downloads-image]: https://img.shields.io/npm/dm/array.prototype.indexof.svg\n[downloads-url]: https://npm-stat.com/charts.html?package=array.prototype.indexof\n[codecov-image]: https://codecov.io/gh/es-shims/Array.prototype.indexOf/branch/main/graphs/badge.svg\n[codecov-url]: https://app.codecov.io/gh/es-shims/Array.prototype.indexOf/\n[actions-image]: https://img.shields.io/endpoint?url=https://github-actions-badge-u3jn4tfpocch.runkit.sh/es-shims/Array.prototype.indexOf\n[actions-url]: https://github.com/es-shims/Array.prototype.indexOf/actions\n","project_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fes-shims%2Farray.prototype.indexof","html_url":"https://awesome.ecosyste.ms/projects/github.com%2Fes-shims%2Farray.prototype.indexof","lists_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fes-shims%2Farray.prototype.indexof/lists"}