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+---
+title: String.prototype.repeat()
+slug: Web/JavaScript/Reference/Global_Objects/String/repeat
+translation_of: Web/JavaScript/Reference/Global_Objects/String/repeat
+original_slug: Web/JavaScript/Referencje/Obiekty/String/repeat
+---
+<div>{{JSRef}}</div>
+
+<p>The <strong><code>repeat()</code></strong> method constructs and returns a new string which contains the specified number of copies of the string on which it was called, concatenated together.</p>
+
+<h2 id="Składnia">Składnia</h2>
+
+<pre class="syntaxbox"><var>str</var>.repeat(<var>count</var>)</pre>
+
+<h3 id="Parametry">Parametry</h3>
+
+<dl>
+ <dt><code>count</code></dt>
+ <dd>An integer between 0 and +∞: [0, +∞), indicating the number of times to repeat the string in the newly-created string that is to be returned.</dd>
+</dl>
+
+<h3 id="Zwracana_wartość">Zwracana wartość</h3>
+
+<p>A new string containing the specified number of copies of the given string.</p>
+
+<h3 id="Exceptions">Exceptions</h3>
+
+<ul>
+ <li>{{jsxref("Errors/Negative_repetition_count", "RangeError")}}: repeat count must be non-negative.</li>
+ <li>{{jsxref("Errors/Resulting_string_too_large", "RangeError")}}: repeat count must be less than infinity and not overflow maximum string size.</li>
+</ul>
+
+<h2 id="Przykłady">Przykłady</h2>
+
+<pre class="brush: js">'abc'.repeat(-1);   // RangeError
+'abc'.repeat(0);    // ''
+'abc'.repeat(1);    // 'abc'
+'abc'.repeat(2);    // 'abcabc'
+'abc'.repeat(3.5);  // 'abcabcabc' (count will be converted to integer)
+'abc'.repeat(1/0);  // RangeError
+
+({ toString: () =&gt; 'abc', repeat: String.prototype.repeat }).repeat(2);
+// 'abcabc' (repeat() is a generic method)
+</pre>
+
+<h2 id="Polyfill">Polyfill</h2>
+
+<p>This method has been added to the ECMAScript 6 specification and may not be available in all JavaScript implementations yet. However, you can polyfill <code>String.prototype.repeat()</code> with the following snippet:</p>
+
+<pre class="brush: js">if (!String.prototype.repeat) {
+  String.prototype.repeat = function(count) {
+    'use strict';
+    if (this == null) {
+      throw new TypeError('can\'t convert ' + this + ' to object');
+    }
+    var str = '' + this;
+    count = +count;
+    if (count != count) {
+      count = 0;
+    }
+    if (count &lt; 0) {
+      throw new RangeError('repeat count must be non-negative');
+    }
+    if (count == Infinity) {
+      throw new RangeError('repeat count must be less than infinity');
+    }
+    count = Math.floor(count);
+    if (str.length == 0 || count == 0) {
+      return '';
+    }
+    // Ensuring count is a 31-bit integer allows us to heavily optimize the
+    // main part. But anyway, most current (August 2014) browsers can't handle
+    // strings 1 &lt;&lt; 28 chars or longer, so:
+    if (str.length * count &gt;= 1 &lt;&lt; 28) {
+      throw new RangeError('repeat count must not overflow maximum string size');
+    }
+    var rpt = '';
+    for (;;) {
+      if ((count &amp; 1) == 1) {
+        rpt += str;
+      }
+      count &gt;&gt;&gt;= 1;
+      if (count == 0) {
+        break;
+      }
+      str += str;
+    }
+    // Could we try:
+    // return Array(count + 1).join(this);
+    return rpt;
+  }
+}
+</pre>
+
+<h2 id="Specifications">Specifications</h2>
+
+<table class="standard-table">
+ <tbody>
+  <tr>
+   <th scope="col">Specification</th>
+   <th scope="col">Status</th>
+   <th scope="col">Comment</th>
+  </tr>
+  <tr>
+   <td>{{SpecName('ES6', '#sec-string.prototype.repeat', 'String.prototype.repeat')}}</td>
+   <td>{{Spec2('ES6')}}</td>
+   <td>Initial definition.</td>
+  </tr>
+  <tr>
+   <td>{{SpecName('ESDraft', '#sec-string.prototype.repeat', 'String.prototype.repeat')}}</td>
+   <td>{{Spec2('ESDraft')}}</td>
+   <td> </td>
+  </tr>
+ </tbody>
+</table>
+
+<h2 id="Browser_compatibility">Browser compatibility</h2>
+
+<div>{{CompatibilityTable}}</div>
+
+<div id="compat-desktop">
+<table class="compat-table">
+ <tbody>
+  <tr>
+   <th>Feature</th>
+   <th>Chrome</th>
+   <th>Firefox (Gecko)</th>
+   <th>Internet Explorer</th>
+   <th>Opera</th>
+   <th>Safari</th>
+  </tr>
+  <tr>
+   <td>Basic support</td>
+   <td>{{CompatChrome("41")}} </td>
+   <td>{{CompatGeckoDesktop("24")}}</td>
+   <td>{{CompatNo}}</td>
+   <td>{{CompatNo}}</td>
+   <td>{{CompatSafari("9")}}</td>
+  </tr>
+ </tbody>
+</table>
+</div>
+
+<div id="compat-mobile">
+<table class="compat-table">
+ <tbody>
+  <tr>
+   <th>Feature</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>Basic support</td>
+   <td>{{CompatNo}}</td>
+   <td>{{CompatChrome("36")}}</td>
+   <td>{{CompatGeckoMobile("24")}}</td>
+   <td>{{CompatNo}}</td>
+   <td>{{CompatNo}}</td>
+   <td>{{CompatNo}}</td>
+  </tr>
+ </tbody>
+</table>
+</div>