--- title: Array.prototype.includes() slug: Web/JavaScript/Referencia/Objectes_globals/Array/includes translation_of: Web/JavaScript/Reference/Global_Objects/Array/includes ---
El mètode includes()
determina si un array inclou un element concret, retornant true
o false
segons s'escaigui.
var boolean = array.includes(elementCercat[, desdePosicio])
elementCercat
. Un valor negatiu cercarà el nombre absolut donat de posicions contant des del final de l'array. El seu valor per defecte és 0.Un {{jsxref("Boolean")}}.
[1, 2, 3].includes(2); // true [1, 2, 3].includes(4); // false [1, 2, 3].includes(3, 3); // false [1, 2, 3].includes(3, -1); // true [1, 2, NaN].includes(NaN); // true
if (!Array.prototype.includes) { Array.prototype.includes = function(searchElement /*, fromIndex*/ ) { 'use strict'; var O = Object(this); var len = parseInt(O.length) || 0; if (len === 0) { return false; } var n = parseInt(arguments[1]) || 0; var k; if (n >= 0) { k = n; } else { k = len + n; if (k < 0) {k = 0;} } var currentElement; while (k < len) { currentElement = O[k]; if (searchElement === currentElement || (searchElement !== searchElement && currentElement !== currentElement)) { // NaN !== NaN return true; } k++; } return false; }; }
Especificació | Estat | Comentaris |
---|---|---|
{{SpecName('ES7', '#sec-array.prototype.includes', 'Array.prototype.includes')}} | {{Spec2('ES7')}} | Definició inicial. |
{{SpecName('ESDraft', '#sec-array.prototype.includes', 'Array.prototype.includes')}} | {{Spec2('ESDraft')}} |
Característica | Chrome | Firefox (Gecko) | Internet Explorer | Edge | Opera | Safari |
---|---|---|---|---|---|---|
Suport bàsic |
{{CompatChrome(47)}} |
43 | {{CompatNo}} | {{CompatNo}} | 34 | 9 |
Característica | Android | Android Webview | Firefox Mobile (Gecko) | IE Mobile | Opera Mobile | Safari Mobile | Chrome for Android |
---|---|---|---|---|---|---|---|
Suport bàsic | {{CompatNo}} |
{{CompatChrome(47)}} |
43 | {{CompatNo}} | 34 | 9 |
{{CompatChrome(47)}} |