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authorPeter Bengtsson <mail@peterbe.com>2020-12-08 14:42:17 -0500
committerPeter Bengtsson <mail@peterbe.com>2020-12-08 14:42:17 -0500
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+---
+title: yield*
+slug: Web/JavaScript/Reference/Operators/yield*
+tags:
+ - ECMAScript 2015
+ - Generators
+ - Iterable
+ - Iterator
+ - JavaScript
+ - Operator
+ - Reference
+translation_of: Web/JavaScript/Reference/Operators/yield*
+---
+<div>{{jsSidebar("Operators")}}</div>
+
+<p><strong><code>yield*</code> 표현식</strong>은 다른 {{jsxref("Statements/function*", "generator")}} 또는 이터러블(iterable) 객체에 yield를 위임할 때 사용됩니다.</p>
+
+<div>{{EmbedInteractiveExample("pages/js/expressions-yieldasterisk.html")}}</div>
+
+
+
+<h2 id="구문">구문</h2>
+
+<pre class="syntaxbox">yield* [[<em>expression</em>]];</pre>
+
+<dl>
+ <dt><code>expression</code></dt>
+ <dd>이터러블(iterable) 객체를 반환하는 표현식.</dd>
+</dl>
+
+<h2 id="설명">설명</h2>
+
+<p>yield* 표현은 피연산자를 반복하고 반환되는 값을 yield합니다.</p>
+
+<p>yield* 표현 자체의 값은 반복자(iterator)가 종료될 때 반환되는 값입니다. (i.e., done이 true일 때)</p>
+
+<h2 id="예제">예제</h2>
+
+<h3 id="다른_생성기(generator)에_위임하기">다른 생성기(generator)에 위임하기</h3>
+
+<p>다음 코드는, next() 호출을 통해 g1()으로부터 yield 되는 값을 g2()에서 yield 되는 것처럼 만듭니다.</p>
+
+<pre class="brush: js">function* g1() {
+ yield 2;
+ yield 3;
+ yield 4;
+}
+
+function* g2() {
+ yield 1;
+ yield* g1();
+ yield 5;
+}
+
+var iterator = g2();
+
+console.log(iterator.next()); // { value: 1, done: false }
+console.log(iterator.next()); // { value: 2, done: false }
+console.log(iterator.next()); // { value: 3, done: false }
+console.log(iterator.next()); // { value: 4, done: false }
+console.log(iterator.next()); // { value: 5, done: false }
+console.log(iterator.next()); // { value: undefined, done: true }
+</pre>
+
+<h3 id="다른_이터러블(iterable)_객체">다른 이터러블(iterable) 객체</h3>
+
+<p>생성기 객체 말고도, yield*는 다른 반복 가능한 객체도 yield 할 수 있습니다. e.g. 배열, 문자열 또는 arguments 객체</p>
+
+<pre class="brush: js">function* g3() {
+ yield* [1, 2];
+ yield* "34";
+ yield* Array.from(arguments);
+}
+
+var iterator = g3(5, 6);
+
+console.log(iterator.next()); // { value: 1, done: false }
+console.log(iterator.next()); // { value: 2, done: false }
+console.log(iterator.next()); // { value: "3", done: false }
+console.log(iterator.next()); // { value: "4", done: false }
+console.log(iterator.next()); // { value: 5, done: false }
+console.log(iterator.next()); // { value: 6, done: false }
+console.log(iterator.next()); // { value: undefined, done: true }
+</pre>
+
+<h3 id="yield*_표현_자체의_값"><code>yield*</code> 표현 자체의 값</h3>
+
+<p><code>yield*</code> 는 구문이 아닌 표현입니다. 따라서 값으로 평가됩니다.</p>
+
+<pre class="brush: js">function* g4() {
+ yield* [1, 2, 3];
+ return "foo";
+}
+
+var result;
+
+function* g5() {
+ result = yield* g4();
+}
+
+var iterator = g5();
+
+console.log(iterator.next()); // { value: 1, done: false }
+console.log(iterator.next()); // { value: 2, done: false }
+console.log(iterator.next()); // { value: 3, done: false }
+console.log(iterator.next()); // { value: undefined, done: true },
+ // g4() 는 여기서 { value: "foo", done: true }를 반환합니다
+
+console.log(result); // "foo"
+</pre>
+
+<h2 id="명세">명세</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('ES2015', '#sec-generator-function-definitions-runtime-semantics-evaluation', 'Yield')}}</td>
+ <td>{{Spec2('ES2015')}}</td>
+ <td>Initial definition.</td>
+ </tr>
+ <tr>
+ <td>{{SpecName('ESDraft', '#sec-generator-function-definitions-runtime-semantics-evaluation', 'Yield')}}</td>
+ <td>{{Spec2('ESDraft')}}</td>
+ <td> </td>
+ </tr>
+ </tbody>
+</table>
+
+<h2 id="브라우저_호환성">브라우저 호환성</h2>
+
+
+
+<p>{{Compat("javascript.operators.yield_star")}}</p>
+
+<h2 id="Firefox에_한정된_내용">Firefox에 한정된 내용</h2>
+
+<ul>
+ <li>Gecko 33 {{geckoRelease(33)}} 부터, yield 표현 구문 분석이 최신 ES6 표준에 맞추도록 업데이트 되었습니다 ({{bug(981599)}}):
+ <ul>
+ <li>개행 제한이 이제 구현되었습니다. 개행이 없는 "yield" 와 "*"만 인정됩니다. 다음과 같은 코드는 {{jsxref("SyntaxError")}}를 발생시킵니다:
+ <pre class="brush: js">function* foo() {
+ yield
+ *[];
+}</pre>
+ </li>
+ </ul>
+ </li>
+</ul>
+
+<h2 id="같이_보기">같이 보기</h2>
+
+<ul>
+ <li><a href="/en-US/docs/Web/JavaScript/Guide/The_Iterator_protocol">The Iterator protocol</a></li>
+ <li>{{jsxref("Statements/function*", "function*")}}</li>
+ <li>{{jsxref("Operators/function*", "function* expression")}}</li>
+ <li>{{jsxref("Operators/yield", "yield")}}</li>
+</ul>