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+---
+title: async function 표현식
+slug: Web/JavaScript/Reference/Operators/async_function
+translation_of: Web/JavaScript/Reference/Operators/async_function
+---
+<div>{{jsSidebar("Operators")}}</div>
+
+<p><strong><code>async function</code></strong> 키워드는 표현식 내에서 <code>async</code> 함수를 정의하기 위해 사용됩니다.</p>
+
+<p>또한 <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/async_function" title="The async function keyword can be used to define async functions inside expressions.">async function statement</a>을 사용하여 async 함수를 정의할 수 있습니다.</p>
+
+<h2 id="문법">문법</h2>
+
+<pre class="syntaxbox">async function [<em>name</em>]([<em>param1</em>[, <em>param2[</em>, ..., <em>paramN</em>]]]) { <em>statements </em>}</pre>
+
+<p>ES2015에서와 같이 <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Functions/Arrow_functions">arrow functions</a>를 사용해도 됩니다.</p>
+
+<h3 id="인수">인수</h3>
+
+<dl>
+ <dt><code><var>name</var></code></dt>
+ <dd>함수 이름. 생략가능하며 이경우함수는 <em>anonymous</em> 형식임  이름은 함수 몸체에 대해 지역적으로 사용.</dd>
+ <dt><code><var>paramN</var></code></dt>
+ <dd>함수에 전달될 인수의 이름.</dd>
+ <dt><code><var>statements</var></code></dt>
+ <dd>함수 몸체를 구성하는 명령문들.</dd>
+</dl>
+
+<h2 id="설명">설명</h2>
+
+<p><code>async function</code> 표현식은 {{jsxref('Statements/async_function', '<code>async function</code> 선언')}} 문법과 유사하며, 거의 동일합니다. <code>async function</code> 표현식과 <code>async function</code> 선언문의 주요 차이점은 익명함수로써의 사용 여부로, <code>async function</code> 표현식은 함수 이름을 생략하면 익명함수를 만듭니다. <code>async function</code> 표현식은 {{Glossary("IIFE")}}(즉시실행함수)로 사용할 수 있습니다. <code><a href="/en-US/docs/Web/JavaScript/Reference/Functions">functions</a></code>문서를 참고하세요.</p>
+
+<h2 id="Examples">Examples</h2>
+
+<h3 id="Simple_example">Simple example</h3>
+
+<pre><code>function resolveAfter2Seconds(x) {
+  return new Promise(resolve =&gt; {
+    setTimeout(() =&gt; {
+      resolve(x);
+    }, 2000);
+  });
+};
+
+
+var add = async function(x) { // async function 표현식을 변수에 할당
+  var a = await resolveAfter2Seconds(20);
+  var b = await resolveAfter2Seconds(30);
+  return x + a + b;
+};
+
+add(10).then(v =&gt; {
+  console.log(v);  // 4초 뒤에 60 출력
+});
+
+
+(async function(x) { // async function 표현식을 IIFE로 사용
+  var p_a = resolveAfter2Seconds(20);
+  var p_b = resolveAfter2Seconds(30);
+  return x + await p_a + await p_b;
+})(10).then(v =&gt; {
+  console.log(v);  // 2초 뒤에 60 출력
+});</code></pre>
+
+<h2 id="Specifications">Specifications</h2>
+
+<table class="standard-table">
+ <thead>
+  <tr>
+   <th scope="col">Specification</th>
+   <th scope="col">Status</th>
+   <th scope="col">Comment</th>
+  </tr>
+ </thead>
+ <tbody>
+  <tr>
+   <td>{{SpecName('ESDraft', '#sec-async-function-definitions', 'async function')}}</td>
+   <td>{{Spec2('ESDraft')}}</td>
+   <td>Initial definition in ES2017.</td>
+  </tr>
+ </tbody>
+</table>
+
+<h2 id="Browser_compatibility">Browser compatibility</h2>
+
+<div>{{Compat("javascript.operators.async_function_expression")}} </div>
+
+<div id="compat-mobile"></div>
+
+<h2 id="See_also">See also</h2>
+
+<ul>
+ <li>{{jsxref("Statements/async_function", "async function")}}</li>
+ <li>{{jsxref("AsyncFunction")}} object</li>
+ <li>{{jsxref("Operators/await", "await")}}</li>
+</ul>