A spec-compliant `Array.prototype.includes` shim/polyfill/replacement that works as far down as ES3. 

An ES7/ES2016 spec-compliant `Array.prototype.includes` shim/polyfill/replacement that works as far down as ES3.

ljharb

array-includes

A spec-compliant `Array.prototype.includes` shim/polyfill/replacement that works as far down as ES3.

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	"requirePaddingNewLinesBeforeLineComments": true,

	"requireCurlyBraces": ["if", "else", "for", "while", "do", "try", "catch"],

	"requireSpaceAfterKeywords": ["if", "else", "for", "while", "do", "switch", "return", "try", "catch", "function"],

	"requireSpacesInAnonymousFunctionExpression": { "beforeOpeningRoundBrace": true, "beforeOpeningCurlyBrace": true },

	"requireSpacesInNamedFunctionExpression": { "beforeOpeningCurlyBrace": true },

	"disallowSpacesInNamedFunctionExpression": { "beforeOpeningRoundBrace": true },

	"requireSpacesInFunctionDeclaration": { "beforeOpeningCurlyBrace": true },

	"disallowSpacesInFunctionDeclaration": { "beforeOpeningRoundBrace": true },

	"disallowSpacesInsideParentheses": true,

	"disallowSpacesInsideArrayBrackets": true,

	"disallowQuotedKeysInObjects": "allButReserved",

	"disallowSpaceAfterPrefixUnaryOperators": ["++", "--", "+", "-", "~", "!"],

	"requireSpaceAfterPrefixUnaryOperators": [],

	"disallowSpaceBeforePostfixUnaryOperators": ["++", "--"],

	"requireSpaceBeforePostfixUnaryOperators": [],

	"disallowSpaceBeforeBinaryOperators": [],

	"requireSpaceBeforeBinaryOperators": ["+", "-", "/", "*", "=", "==", "===", "!=", "!=="],

	"requireSpaceAfterBinaryOperators": ["+", "-", "/", "*", "=", "==", "===", "!=", "!=="],

	"disallowSpaceAfterBinaryOperators": [],

	"disallowImplicitTypeConversion": ["binary", "string"],

	"excludeFiles": ["node_modules/**", "vendor/**"],

	"requirePaddingNewLinesBeforeExport": true,

	"requirePaddingNewLinesAfterUseStrict": true

  * Update `es-abstract`, `tape`, `eslint`, `semver`, `jscs`, `semver`

  * Update `es-abstract`, `editorconfig-tools`, `nsp`, `eslint`, `semver`

  * All grade A-supported `node`/`iojs` versions now ship with an `npm` that understands `^`.

  * Run `travis-ci` tests on `iojs` and `node` v0.12; allow 0.8 failures.

  * Update `tape`, `jscs`, `es-abstract`, remove `is`.

  * Update `tape`, `jscs`, `nsp`, `eslint`, `es-abstract`

  * Use `es-abstract` for ECMAScript spec internal abstract operations

  * Speed optimization: use Array#indexOf when available

  * Fix ES3, IE 6-8, Opera 10.6, Opera 11.1 support

  * Ensure tests are includes in the module on `npm`

	"description": "A spec-compliant `Array.prototype.includes` shim/polyfill/replacement that works as far down as ES3.",

		"test": "npm run lint && npm run test:shimmed && npm run test:module && npm run security",

		"test:shimmed": "node test/shimmed.js",

		"coverage:quiet": "covert test/*.js --quiet",

		"lint": "npm run jscs && npm run eslint",

		"eccheck": "editorconfig-tools check *.js **/*.js > /dev/null",

		"url": "git://github.com/ljharb/array-includes.git"

var defineProperties = require('define-properties');

var isEnumerable = Object.prototype.propertyIsEnumerable;

var functionsHaveNames = function f() {}.name === 'f';

	t.equal(Array.prototype.includes.length, 1, 'Array#includes has a length of 1');

	t.test('Function name', { skip: !functionsHaveNames }, function (st) {

		st.equal(Array.prototype.includes.name, 'includes', 'Array#includes has name "includes"');

	t.test('enumerability', { skip: !defineProperties.supportsDescriptors }, function (et) {

		et.equal(false, isEnumerable.call(Array.prototype, 'includes'), 'Array#includes is not enumerable');

		var fn = function () { return this === null; };

	t.test('bad array/this value', { skip: !supportsStrictMode }, function (st) {

		st.throws(function () { return includes(undefined, 'a'); }, TypeError, 'undefined is not an object');

		st.throws(function () { return includes(null, 'a'); }, TypeError, 'null is not an object');

	require('./tests')(bind.call(Function.call, Array.prototype.includes), t);

		@@ -0,1 +1,6 @@
		1.1.1 / 2015-05-23
		=================
		* Test up to `io.js` `v2.0`
		* Update `es-abstract`, `tape`, `eslint`, `semver`, `jscs`, `semver`

		1.1.0 / 2015-03-19
		@@ -2,0 +7,0 @@ =================

		{
		"name": "array-includes",
		"version": "1.1.0",
		"version": "1.1.1",
		"author": "Jordan Harband",
		@@ -36,3 +36,3 @@ "description": "A spec-compliant `Array.prototype.includes` shim/polyfill/replacement that works as far down as ES3.",
		"define-properties": "^1.0.1",
		"es-abstract": "^1.2.0"
		"es-abstract": "^1.2.1"
		},
		@@ -42,10 +42,10 @@ "devDependencies": {
		"function-bind": "^1.0.2",
		"tape": "^3.5.0",
		"tape": "^4.0.0",
		"indexof": "^0.0.1",
		"covert": "^1.0.1",
		"jscs": "^1.11.3",
		"covert": "^1.1.0",
		"jscs": "^1.13.1",
		"editorconfig-tools": "^0.1.1",
		"nsp": "^1.0.1",
		"eslint": "^0.17.1",
		"semver": "^4.3.1",
		"eslint": "^0.21.2",
		"semver": "^4.3.4",
		"replace": "^0.3.0"
		@@ -52,0 +52,0 @@ },

		@@ -24,2 +24,3 @@ var includes = require('../');
		'use strict';

		var fn = function () { return this === null; };
		@@ -31,2 +32,3 @@ return fn.call(null);
		'use strict';

		st.throws(function () { return includes(undefined, 'a'); }, TypeError, 'undefined is not an object');
		@@ -33,0 +35,0 @@ st.throws(function () { return includes(null, 'a'); }, TypeError, 'null is not an object');

Improved metrics

Dependency changes

		{
		"additionalRules": [],

		"requireSemicolons": true,

		"disallowMultipleSpaces": true,

		"disallowIdentifierNames": [],

		"requirePaddingNewLinesBeforeLineComments": true,

		"requireCurlyBraces": ["if", "else", "for", "while", "do", "try", "catch"],
		@@ -66,4 +74,34 @@
		"mark": "'"
		}
		},

		"disallowOperatorBeforeLineBreak": [],

		"requireSpaceBeforeKeywords": [
		"do",
		"for",
		"if",
		"else",
		"switch",
		"case",
		"try",
		"catch",
		"finally",
		"while",
		"with",
		"return"
		],

		"validateAlignedFunctionParameters": {
		"lineBreakAfterOpeningBraces": true,
		"lineBreakBeforeClosingBraces": true
		},

		"requirePaddingNewLinesBeforeExport": true,

		"validateNewlineAfterArrayElements": {
		"maximum": 3
		},

		"requirePaddingNewLinesAfterUseStrict": true
		}