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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: Object.entries()
+slug: Web/JavaScript/Reference/Global_Objects/Object/entries
+translation_of: Web/JavaScript/Reference/Global_Objects/Object/entries
+---
+<div>{{JSRef}}</div>
+
+<p><code><strong>Object.entries()</strong></code> 메서드는 {{jsxref("Statements/for...in", "for...in")}}와 같은 순서로 주어진 객체 자체의 enumerable 속성 <code>[key, value]</code> 쌍의 배열을 반환합니다. (<code>for-in</code> 루프가 다른점은 프로토 타입 체인의 속성도 열거한다는 점입니다).</p>
+
+<p><code><strong>Object.entries()</strong></code> 에 의해 반환된 배열(array)의 순서는 객체가 정의된 방법과 관련이 없습니다.  배열 순서가 쓸 곳이 있다면, 다음과 같이 정렬을 먼저 하시는 것이 좋습니다 <code>Object.entries(obj).sort((a, b) =&gt; b[0].localeCompare(a[0]));</code>.</p>
+
+<div>{{EmbedInteractiveExample("pages/js/object-entries.html", "taller")}}</div>
+
+
+
+<h2 id="Syntax">Syntax</h2>
+
+<pre class="syntaxbox notranslate">Object.entries(<var>obj</var>)</pre>
+
+<h3 id="Parameters">Parameters</h3>
+
+<dl>
+ <dt><code>obj</code></dt>
+ <dd>객체 자체의 열거 가능한 문자열 키를 가진 속성 <code>[key, value]</code> 쌍이 반환되는 객체입니다.</dd>
+</dl>
+
+<h3 id="Return_value">Return value</h3>
+
+<p>지정된 객체 자체의 열거 가능한 문자속성 <code>[key, value]</code> 쌍의 배열입니다.</p>
+
+<h2 id="Description">Description</h2>
+
+<p><code>Object.entries()</code>는 <code>object</code>에 직접있는 enumerable 속성 <code>[key, value]</code> 쌍에 해당하는 배열을 반환합니다. 속성의 순서는 개체의 속성 값을 수동으로 반복하여 주어진 순서와 동일합니다.</p>
+
+<h2 id="Polyfill">Polyfill</h2>
+
+<p>기본적으로 지원하지 않는 이전 환경에서 호환 가능한 <code>Object.entries</code> 지원을 추가하려면 <a href="https://github.com/tc39/proposal-object-values-entries">tc39/proposal-object-values-entries</a>에 Object.entries의 데모 구현을 찾을 수 있습니다 (IE에 대한 지원이 필요하지 않은 경우) , <a href="https://github.com/es-shims/Object.entries">es-shims/Object.entries</a> 저장소에있는 polyfill을 사용하거나 아래에 나열된 polyfill을 간단하게 배치 할 수 있습니다.</p>
+
+<pre class="brush: js notranslate">if (!Object.entries)
+  Object.entries = function( obj ){
+ var ownProps = Object.keys( obj ),
+  i = ownProps.length,
+ resArray = new Array(i); // preallocate the Array
+  while (i--)
+  resArray[i] = [ownProps[i], obj[ownProps[i]]];
+
+  return resArray;
+ };
+</pre>
+
+<p>For the above polyfill code snippet, if you need support for IE &lt; 9, then you will also need an Object.keys polyfill (such as the one found on the {{jsxref("Object.keys")}} page).</p>
+
+<p>위의 polyfill 코드 스 니펫의 경우 Internet Explorer (9버전 이전)를 지원해야하는 경우 Object.keys polyfill ( {{jsxref("Object.keys")}} 페이지에 있는 것과 같은)도 필요합니다.</p>
+
+<h2 id="Examples">Examples</h2>
+
+<pre class="brush: js notranslate">const obj = { foo: 'bar', baz: 42 };
+console.log(Object.entries(obj)); // [ ['foo', 'bar'], ['baz', 42] ]
+
+// array like object
+const obj = { 0: 'a', 1: 'b', 2: 'c' };
+console.log(Object.entries(obj)); // [ ['0', 'a'], ['1', 'b'], ['2', 'c'] ]
+
+// array like object with random key ordering
+const anObj = { 100: 'a', 2: 'b', 7: 'c' };
+console.log(Object.entries(anObj)); // [ ['2', 'b'], ['7', 'c'], ['100', 'a'] ]
+
+// getFoo is property which isn't enumerable
+const myObj = Object.create({}, { getFoo: { value() { return this.foo; } } });
+myObj.foo = 'bar';
+console.log(Object.entries(myObj)); // [ ['foo', 'bar'] ]
+
+// non-object argument will be coerced to an object
+console.log(Object.entries('foo')); // [ ['0', 'f'], ['1', 'o'], ['2', 'o'] ]
+
+// returns an empty array for any primitive type, since primitives have no own properties
+console.log(Object.entries(100)); // [ ]
+
+// iterate through key-value gracefully
+const obj = { a: 5, b: 7, c: 9 };
+for (const [key, value] of Object.entries(obj)) {
+ console.log(`${key} ${value}`); // "a 5", "b 7", "c 9"
+}
+
+// Or, using array extras
+Object.entries(obj).forEach(([key, value]) =&gt; {
+console.log(`${key} ${value}`); // "a 5", "b 7", "c 9"
+});
+</pre>
+
+<h3 id="Converting_an_Object_to_a_Map">Converting an <code>Object</code> to a <code>Map</code></h3>
+
+<p>{{jsxref("Map", "new Map()")}} 생성자는 반복 가능한 항목을 허용합니다. <code>Object.entries</code>를 사용하면 {{jsxref("Object")}}에서 {{jsxref("Map")}}로 쉽게 변환 할 수 있습니다.</p>
+
+
+
+<pre class="brush: js notranslate">const obj = { foo: 'bar', baz: 42 };
+const map = new Map(Object.entries(obj));
+console.log(map); // Map { foo: "bar", baz: 42 }
+</pre>
+
+<h3 id="Iterating_through_an_Object">Iterating through an <code>Object</code></h3>
+
+<p><a href="/en-US/docs/Web/JavaScript/Reference/Operators/Destructuring_assignment#Array_destructuring">Array Destructuring</a>을 사용하면 객체를 쉽게 반복 할 수 있습니다.</p>
+
+<pre class="brush: js notranslate">const obj = { foo: 'bar', baz: 42 };
+Object.entries(obj).forEach(([key, value]) =&gt; console.log(`${key}: ${value}`)); // "foo: bar", "baz: 42"
+</pre>
+
+<h2 id="Specifications">Specifications</h2>
+
+<table>
+ <thead>
+ <tr>
+ <th scope="col">Specification</th>
+ </tr>
+ </thead>
+ <tbody>
+ <tr>
+ <td>{{SpecName('ESDraft', '#sec-object.entries', 'Object.entries')}}</td>
+ </tr>
+ </tbody>
+</table>
+
+<h2 id="Browser_compatibility">Browser compatibility</h2>
+
+<div>
+
+
+<p>{{Compat("javascript.builtins.Object.entries")}}</p>
+</div>
+
+<h2 id="See_also">See also</h2>
+
+<ul>
+ <li><a href="/ko/docs/Web/JavaScript/Enumerability_and_ownership_of_properties">Enumerability and ownership of properties</a></li>
+ <li>{{jsxref("Object.keys()")}}</li>
+ <li>{{jsxref("Object.values()")}}</li>
+ <li>{{jsxref("Object.prototype.propertyIsEnumerable()")}}</li>
+ <li>{{jsxref("Object.create()")}}</li>
+ <li>{{jsxref("Object.getOwnPropertyNames()")}}</li>
+ <li>{{jsxref("Map.prototype.entries()")}}</li>
+ <li>{{jsxref("Map.prototype.keys()")}}</li>
+ <li>{{jsxref("Map.prototype.values()")}}</li>
+</ul>