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95 lines
2.9 KiB
Markdown
95 lines
2.9 KiB
Markdown
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# array-includes <sup>[![Version Badge][npm-version-svg]][package-url]</sup>
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[![Build Status][travis-svg]][travis-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](http://www.ecma-international.org/ecma-262/6.0/).
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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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## 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]: http://versionbadg.es/es-shims/array-includes.svg
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[travis-svg]: https://travis-ci.org/es-shims/array-includes.svg
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[travis-url]: https://travis-ci.org/es-shims/array-includes
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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]: http://img.shields.io/npm/l/array-includes.svg
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[license-url]: LICENSE
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[downloads-image]: http://img.shields.io/npm/dm/array-includes.svg
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[downloads-url]: http://npm-stat.com/charts.html?package=array-includes
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