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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
+---
+<div>{{JSRef}}</div>
+
+<p><strong><code>repeat()</code></strong> 메서드는 문자열을 주어진 횟수만큼 반복해 붙인 새로운 문자열을 반환합니다.</p>
+
+<h2 id="구문">구문</h2>
+
+<pre><code><var>str</var>.repeat(<var>count</var>);</code></pre>
+
+<h3 id="매개변수">매개변수</h3>
+
+<dl>
+ <dt><code>count</code></dt>
+ <dd>문자열을 반복할 횟수. 0과 양의 무한대 사이의 정수([0, +∞)).</dd>
+</dl>
+
+<h3 id="반환값">반환값</h3>
+
+<p>현재 문자열을 주어진 횟수만큼 반복해 붙인 새로운 문자열.</p>
+
+<h3 id="예외">예외</h3>
+
+<ul>
+ <li>{{jsxref("Errors/Negative_repetition_count", "RangeError")}}: 반복 횟수는 양의 정수여야 함.</li>
+ <li>{{jsxref("Errors/Resulting_string_too_large", "RangeError")}}: 반복 횟수는 무한대보다 작아야 하며, 최대 문자열 크기를 넘어선 안됨.</li>
+</ul>
+
+<h2 id="예제">예제</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="폴리필">폴리필</h2>
+
+<p><code>repeat</code>은 ECMAScript 2015 명세에 추가됐습니다. 따라서 어떤 표준 구현체에서는 사용할 수 없을 수도 있습니다. 그러나 아래 코드를 포함하면 지원하지 않는 플랫폼에서도 <font face="consolas, Liberation Mono, courier, monospace"><span style="background-color: rgba(220, 220, 220, 0.5);">repeat</span></font>을 사용할 수 있습니다.</p>
+
+<pre dir="rtl"><code>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 maxCount = str.length * count;
+    count = Math.floor(Math.log(count) / Math.log(2));
+    while (count) {
+       str += str;
+       count--;
+    }
+    str += str.substring(0, maxCount - str.length);
+    return str;
+  }
+}</code></pre>
+
+<h2 id="명세">명세</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('ES2015', '#sec-string.prototype.repeat', 'String.prototype.repeat')}}</td>
+   <td>{{Spec2('ES2015')}}</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="브라우저_호환성">브라우저 호환성</h2>
+
+<p class="hidden">The compatibility table in this page is generated from structured data. If you'd like to contribute to the data, please check out <a href="https://github.com/mdn/browser-compat-data">https://github.com/mdn/browser-compat-data</a> and send us a pull request.</p>
+
+<p>{{Compat("javascript.builtins.String.repeat")}}</p>