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authorFlorian Merz <me@fiji-flo.de>2021-02-11 14:45:12 +0100
committerFlorian Merz <me@fiji-flo.de>2021-02-11 14:45:12 +0100
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+---
+title: String.prototype.concat()
+slug: Web/JavaScript/Referencia/Objectes_globals/String/concat
+translation_of: Web/JavaScript/Reference/Global_Objects/String/concat
+---
+<div>{{JSRef}}</div>
+
+<p>El mètode <strong><code>concat()</code></strong> combina el text de dos o més strings i retorna un nou string.</p>
+
+<h2 id="Sintaxi">Sintaxi</h2>
+
+<pre class="syntaxbox"><code><var>str</var>.concat(<var>string2</var>, <var>string3</var>[, ..., <var>stringN</var>])</code></pre>
+
+<h3 id="Paràmetres">Paràmetres</h3>
+
+<dl>
+ <dt><code>string2...string<em>N</em></code></dt>
+ <dd>Strings que seran concatenats a aquest string.</dd>
+</dl>
+
+<h2 id="Descripció">Descripció</h2>
+
+<p>La funció <code>concat()</code> combina el text d'un o més strings i retorna un nou string. Canvis al text d'un string no afecten l'altre string.</p>
+
+<h2 id="Exemples">Exemples</h2>
+
+<h3 id="Utilitzar_concat()">Utilitzar <code>concat()</code></h3>
+
+<p>L'exemple següent combina strings en un nou string.</p>
+
+<pre class="brush: js">var hola = 'Hola, ';
+console.log(hola.concat('Kevin', ' tingueu un bon dia.'));
+
+/* Hola, Kevin tingueu un bon dia. */
+</pre>
+
+<h2 id="Rendiment">Rendiment</h2>
+
+<p>Es recomana altament utilitzar els {{jsxref("Operators/Assignment_Operators", "operadors d'assignació", "", 1)}} (<code>+</code>, <code>+=</code>) en comptes del mètode <code>concat()</code>. Vegeu aquest <a href="http://jsperf.com/concat-vs-plus-vs-join">test de rendiment</a>.</p>
+
+<h2 id="Especificacions">Especificacions</h2>
+
+<table class="standard-table">
+ <tbody>
+ <tr>
+ <th scope="col">Especificació</th>
+ <th scope="col">Estat</th>
+ <th scope="col">Comentaris</th>
+ </tr>
+ <tr>
+ <td>{{SpecName('ES3')}}</td>
+ <td>{{Spec2('ES3')}}</td>
+ <td>Definició inicial. Implementat a JavaScript 1.2.</td>
+ </tr>
+ <tr>
+ <td>{{SpecName('ES5.1', '#sec-15.5.4.6', 'String.prototype.concat')}}</td>
+ <td>{{Spec2('ES5.1')}}</td>
+ <td> </td>
+ </tr>
+ <tr>
+ <td>{{SpecName('ES6', '#sec-string.prototype.concat', 'String.prototype.concat')}}</td>
+ <td>{{Spec2('ES6')}}</td>
+ <td> </td>
+ </tr>
+ </tbody>
+</table>
+
+<h2 id="Compatibilitat_amb_navegadors">Compatibilitat amb navegadors</h2>
+
+<div>{{CompatibilityTable}}</div>
+
+<div id="compat-desktop">
+<table class="compat-table">
+ <tbody>
+ <tr>
+ <th>Característica</th>
+ <th>Chrome</th>
+ <th>Firefox (Gecko)</th>
+ <th>Internet Explorer</th>
+ <th>Opera</th>
+ <th>Safari</th>
+ </tr>
+ <tr>
+ <td>Suport bàsic</td>
+ <td>{{CompatVersionUnknown}}</td>
+ <td>{{CompatVersionUnknown}}</td>
+ <td>{{CompatVersionUnknown}}</td>
+ <td>{{CompatVersionUnknown}}</td>
+ <td>{{CompatVersionUnknown}}</td>
+ </tr>
+ </tbody>
+</table>
+</div>
+
+<div id="compat-mobile">
+<table class="compat-table">
+ <tbody>
+ <tr>
+ <th>Característica</th>
+ <th>Android</th>
+ <th>Chrome for Android</th>
+ <th>Firefox Mobile (Gecko)</th>
+ <th>IE Mobile</th>
+ <th>Opera Mobile</th>
+ <th>Safari Mobile</th>
+ </tr>
+ <tr>
+ <td>Suport bàsic</td>
+ <td>{{CompatVersionUnknown}}</td>
+ <td>{{CompatVersionUnknown}}</td>
+ <td>{{CompatVersionUnknown}}</td>
+ <td>{{CompatVersionUnknown}}</td>
+ <td>{{CompatVersionUnknown}}</td>
+ <td>{{CompatVersionUnknown}}</td>
+ </tr>
+ </tbody>
+</table>
+</div>
+
+<h2 id="Vegeu_també">Vegeu també</h2>
+
+<ul>
+ <li>{{jsxref("Array.prototype.concat()")}}</li>
+ <li>{{jsxref("Operators/Assignment_Operators", "Operadors d'asssignació", "", 1)}}</li>
+</ul>