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498 lines
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<h1>
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JSX 스프레드 어트리뷰트
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<a class="edit-page-link" href="https://github.com/facebook/react/tree/master/docs/docs/02.2-jsx-spread.ko-KR.md" target="_blank">Edit on GitHub</a>
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</h1>
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<div class="subHeader"></div>
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<p>미리 컴포넌트에 넣을 모든 프로퍼티를 알게 된다면, JSX를 사용하기 쉬워집니다.</p>
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<div class="highlight"><pre><code class="language-javascript" data-lang="javascript"> <span class="kd">var</span> <span class="nx">component</span> <span class="o">=</span> <span class="o"><</span><span class="nx">Component</span> <span class="nx">foo</span><span class="o">=</span><span class="p">{</span><span class="nx">x</span><span class="p">}</span> <span class="nx">bar</span><span class="o">=</span><span class="p">{</span><span class="nx">y</span><span class="p">}</span> <span class="o">/></span><span class="p">;</span>
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</code></pre></div><h2><a class="anchor" name="props--"></a>Props의 변경은 나빠요 <a class="hash-link" href="#props--">#</a></h2>
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<p>하지만 어떤 프로퍼티를 설정하고 싶은지 모른다면, 객체 레이어에 넣고 싶어질 수도 있습니다.</p>
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<div class="highlight"><pre><code class="language-javascript" data-lang="javascript"> <span class="kd">var</span> <span class="nx">component</span> <span class="o">=</span> <span class="o"><</span><span class="nx">Component</span> <span class="o">/></span><span class="p">;</span>
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<span class="nx">component</span><span class="p">.</span><span class="nx">props</span><span class="p">.</span><span class="nx">foo</span> <span class="o">=</span> <span class="nx">x</span><span class="p">;</span> <span class="c1">// 나쁨</span>
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<span class="nx">component</span><span class="p">.</span><span class="nx">props</span><span class="p">.</span><span class="nx">bar</span> <span class="o">=</span> <span class="nx">y</span><span class="p">;</span> <span class="c1">// 역시 나쁨</span>
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</code></pre></div>
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<p>이것은 안티 패턴입니다. 왜냐하면 한참 뒤까지 정확한 propTypes을 체크할 수 없다는 뜻이기 때문입니다. 이것은 propTypes 에러는 알기 힘든 스택 트레이스로 끝난다는 의미입니다.</p>
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<p>props는 변하지 않는 것으로 간주해야 합니다. props 객체를 변경하는 것은 다른 곳에서 예기치 못한 결과가 생길 수 있기 때문에 이상적으로는 이 시점에서 frozen 객체가 되어야 합니다.</p>
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<h2><a class="anchor" name="-"></a>스프레드 어트리뷰트 <a class="hash-link" href="#-">#</a></h2>
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<p>이제 JSX의 새로운 기능인 스프레드 어트리뷰트를 사용하실 수 있습니다.</p>
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<div class="highlight"><pre><code class="language-javascript" data-lang="javascript"> <span class="kd">var</span> <span class="nx">props</span> <span class="o">=</span> <span class="p">{};</span>
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<span class="nx">props</span><span class="p">.</span><span class="nx">foo</span> <span class="o">=</span> <span class="nx">x</span><span class="p">;</span>
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<span class="nx">props</span><span class="p">.</span><span class="nx">bar</span> <span class="o">=</span> <span class="nx">y</span><span class="p">;</span>
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<span class="kd">var</span> <span class="nx">component</span> <span class="o">=</span> <span class="o"><</span><span class="nx">Component</span> <span class="p">{...</span><span class="nx">props</span><span class="p">}</span> <span class="o">/></span><span class="p">;</span>
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</code></pre></div>
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<p>전달한 객체의 프로퍼티가 컴포넌트의 props에 복사됩니다.</p>
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<p>이렇게 여러 번 사용하거나 다른 어트리뷰트와 조합해서 사용할 수 있습니다. 명세의 순서는 중요합니다. 나중의 어트리뷰트가 이전 것보다 우선되기 때문입니다.</p>
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<div class="highlight"><pre><code class="language-javascript" data-lang="javascript"> <span class="kd">var</span> <span class="nx">props</span> <span class="o">=</span> <span class="p">{</span> <span class="nx">foo</span><span class="o">:</span> <span class="s1">'default'</span> <span class="p">};</span>
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<span class="kd">var</span> <span class="nx">component</span> <span class="o">=</span> <span class="o"><</span><span class="nx">Component</span> <span class="p">{...</span><span class="nx">props</span><span class="p">}</span> <span class="nx">foo</span><span class="o">=</span><span class="p">{</span><span class="s1">'override'</span><span class="p">}</span> <span class="o">/></span><span class="p">;</span>
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<span class="nx">console</span><span class="p">.</span><span class="nx">log</span><span class="p">(</span><span class="nx">component</span><span class="p">.</span><span class="nx">props</span><span class="p">.</span><span class="nx">foo</span><span class="p">);</span> <span class="c1">// 'override'</span>
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</code></pre></div><h2><a class="anchor" name="-...--"></a>이상한 <code>...</code> 표기법은 무엇인가요? <a class="hash-link" href="#-...--">#</a></h2>
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<p><code>...</code> 연산자(스프레드 연산자)는 이미 <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Spread_operator">ES6의 배열</a>에서 지원합니다. <a href="https://github.com/sebmarkbage/ecmascript-rest-spread">객체 rest와 스프레드 프로퍼티</a>에 대한 ES7의 제안도 있습니다. JSX의 구문을 더 깔끔하게 하기 위해 지원되고 개발중인 표준을 활용하고 있습니다.</p>
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