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+---
+title: String.prototype.startsWith()
+slug: Web/JavaScript/Reference/Global_Objects/String/startsWith
+tags:
+  - ECMAScript 2015
+  - JavaScript
+  - Method
+  - Prototype
+  - Reference
+  - String
+translation_of: Web/JavaScript/Reference/Global_Objects/String/startsWith
+---
+<div>{{JSRef}}</div>
+
+<p><span class="seoSummary"><strong><code>startsWith()</code></strong></span><span class="seoSummary"> 메소드는 어떤 문자열이 특정 문자로 시작하는지 확인하여 결과를 <code>true</code> 혹은 <code>false</code>로 반환합니다.</span></p>
+
+<h2 id="구문">구문</h2>
+
+<pre class="syntaxbox"><var>str</var>.startsWith(<var>searchString</var>[, <var>position</var>])</pre>
+
+<h3 id="매개변수">매개변수</h3>
+
+<dl>
+ <dt><code>searchString</code></dt>
+ <dd>문자열의 시작 지점에서 탐색할 문자열</dd>
+ <dt><code>position</code> {{optional_inline}}</dt>
+ <dd><code>searchString</code>을 탐색할 위치. 기본값 0.</dd>
+</dl>
+
+<h3 id="반환_값">반환 값</h3>
+
+<p>문자열이 검색 문자열로 시작하면 <code>true</code>, 아니면 <code>false</code>.</p>
+
+<h2 id="설명"><span style="display: none;"> </span><span style="display: none;"> </span>설명</h2>
+
+<p><code>startsWith</code> 메소드로 어떤 문자열이 다른 문자열로 시작하는지 확인 할 수 있습니다. 대소문자를 구분합니다.</p>
+
+<h2 id="예시">예시</h2>
+
+<h3 id="startsWith()_사용하기"><code>startsWith()</code> 사용하기</h3>
+
+<pre class="brush: js">//startswith
+var str = 'To be, or not to be, that is the question.';
+
+console.log(str.startsWith('To be'));         // true
+console.log(str.startsWith('not to be'));     // false
+console.log(str.startsWith('not to be', 10)); // true
+</pre>
+
+<h2 id="폴리필">폴리필</h2>
+
+<p><code>startsWith</code> 메소드는 ECMAScript 2015 명세에 포함됐으며, 아직까지 모든 JavaScrpt 구현체가 지원하지 않을 수 있습니다. 그러나 아래 코드 조각을 사용해 폴리필 할 수 있습니다.</p>
+
+<pre><code>if (!String.prototype.startsWith) {
+	String.prototype.startsWith = function(search, pos) {
+		return this.substr(!pos || pos &lt; 0 ? 0 : +pos, search.length) === search;
+	};
+}</code></pre>
+
+<p>ES2015 명세를 모두 만족하지만, 더 무거운 폴리필은 <a href="https://github.com/mathiasbynens/String.prototype.startsWith">Mathias Bynens의 GitHub</a> 에서 확인할 수 있습니다.</p>
+
+<h2 id="명세서">명세서</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.startswith', 'String.prototype.startsWith')}}</td>
+   <td>{{Spec2('ES6')}}</td>
+   <td>Initial definition.</td>
+  </tr>
+  <tr>
+   <td>{{SpecName('ESDraft', '#sec-string.prototype.startswith', 'String.prototype.startsWith')}}</td>
+   <td>{{Spec2('ESDraft')}}</td>
+   <td> </td>
+  </tr>
+ </tbody>
+</table>
+
+<h2 id="브라우저_호환성">브라우저 호환성</h2>
+
+<div>{{Compat("javascript.builtins.String.startsWith")}}</div>
+
+<h2 id="관련_문서">관련 문서</h2>
+
+<ul>
+ <li>{{jsxref("String.prototype.endsWith()")}}</li>
+ <li>{{jsxref("String.prototype.includes()")}}</li>
+ <li>{{jsxref("String.prototype.indexOf()")}}</li>
+ <li>{{jsxref("String.prototype.lastIndexOf()")}}</li>
+</ul>