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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: () => '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 < 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 << 28 chars or longer, so:
if (str.length * count >= 1 << 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>
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