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a utilies library reduce boilerplate for vuex
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<h1 id="getters">Getters</h1>
<p>때로는 저장소 상태를 기반하는 상태를 계산해야 할 수도 있습니다.(예: 아이템 리스트를 필터링하고 계산)</p>
<pre class="language-"><code class="lang-js">computed<span class="token punctuation">:</span> <span class="token punctuation">{</span>
doneTodosCount <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token keyword">return</span> <span class="token keyword">this</span><span class="token punctuation">.</span>$store<span class="token punctuation">.</span>state<span class="token punctuation">.</span>todos<span class="token punctuation">.</span><span class="token function">filter</span><span class="token punctuation">(</span>todo <span class="token operator">=</span><span class="token operator">></span> todo<span class="token punctuation">.</span>done<span class="token punctuation">)</span><span class="token punctuation">.</span>length
<span class="token punctuation">}</span>
<span class="token punctuation">}</span>
</code></pre>
<p>둘 이상의 컴포넌트가 이를 사용 해야하는 경우 함수를 복제하거나 공유된 헬퍼를 추출하여 여러 위치에서 가져와야합니다. 둘 다 이상적이지 않습니다.</p>
<p>Vuex를 사용하면 저장소에서 "getters"를 정의 할 수 있습니다(저장소의 계산된 속성으로 생각됩니다). Getters는 첫 번째 전달인자로 상태를 받습니다.</p>
<pre class="language-"><code class="lang-js"><span class="token keyword">const</span> store <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">Vuex<span class="token punctuation">.</span>Store</span><span class="token punctuation">(</span><span class="token punctuation">{</span>
state<span class="token punctuation">:</span> <span class="token punctuation">{</span>
todos<span class="token punctuation">:</span> <span class="token punctuation">[</span>
<span class="token punctuation">{</span> id<span class="token punctuation">:</span> <span class="token number">1</span><span class="token punctuation">,</span> text<span class="token punctuation">:</span> <span class="token string">'...'</span><span class="token punctuation">,</span> done<span class="token punctuation">:</span> <span class="token boolean">true</span> <span class="token punctuation">}</span><span class="token punctuation">,</span>
<span class="token punctuation">{</span> id<span class="token punctuation">:</span> <span class="token number">2</span><span class="token punctuation">,</span> text<span class="token punctuation">:</span> <span class="token string">'...'</span><span class="token punctuation">,</span> done<span class="token punctuation">:</span> <span class="token boolean">false</span> <span class="token punctuation">}</span>
<span class="token punctuation">]</span>
<span class="token punctuation">}</span><span class="token punctuation">,</span>
getters<span class="token punctuation">:</span> <span class="token punctuation">{</span>
doneTodos<span class="token punctuation">:</span> state <span class="token operator">=</span><span class="token operator">></span> <span class="token punctuation">{</span>
<span class="token keyword">return</span> state<span class="token punctuation">.</span>todos<span class="token punctuation">.</span><span class="token function">filter</span><span class="token punctuation">(</span>todo <span class="token operator">=</span><span class="token operator">></span> todo<span class="token punctuation">.</span>done<span class="token punctuation">)</span>
<span class="token punctuation">}</span>
<span class="token punctuation">}</span>
<span class="token punctuation">}</span><span class="token punctuation">)</span>
</code></pre>
<p>getters는 <code>store.getters</code> 객체에 노출 됩니다.</p>
<pre class="language-"><code class="lang-js">store<span class="token punctuation">.</span>getters<span class="token punctuation">.</span>doneTodos <span class="token comment" spellcheck="true">// -> [{ id: 1, text: '...', done: true }]</span>
</code></pre>
<p>Getters는 두 번째 전달인자로 다른 getter도 받게됩니다.</p>
<pre class="language-"><code class="lang-js">getters<span class="token punctuation">:</span> <span class="token punctuation">{</span>
<span class="token comment" spellcheck="true">// ...</span>
doneTodosCount<span class="token punctuation">:</span> <span class="token punctuation">(</span>state<span class="token punctuation">,</span> getters<span class="token punctuation">)</span> <span class="token operator">=</span><span class="token operator">></span> <span class="token punctuation">{</span>
<span class="token keyword">return</span> getters<span class="token punctuation">.</span>doneTodos<span class="token punctuation">.</span>length
<span class="token punctuation">}</span>
<span class="token punctuation">}</span>
</code></pre>
<pre class="language-"><code class="lang-js">store<span class="token punctuation">.</span>getters<span class="token punctuation">.</span>doneTodosCount <span class="token comment" spellcheck="true">// -> 1</span>
</code></pre>
<p>이제 모든 컴포넌트에서 쉽게 사용할 수 있습니다.</p>
<pre class="language-"><code class="lang-js">computed<span class="token punctuation">:</span> <span class="token punctuation">{</span>
doneTodosCount <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token keyword">return</span> <span class="token keyword">this</span><span class="token punctuation">.</span>$store<span class="token punctuation">.</span>getters<span class="token punctuation">.</span>doneTodosCount
<span class="token punctuation">}</span>
<span class="token punctuation">}</span>
</code></pre>
<h3 id="mapgetters-헬퍼"><code>mapGetters</code> 헬퍼</h3>
<p><code>mapGetters</code> 헬퍼는 저장소 getter를 로컬 계산된 속성에 매핑합니다.</p>
<pre class="language-"><code class="lang-js"><span class="token keyword">import</span> <span class="token punctuation">{</span> mapGetters <span class="token punctuation">}</span> <span class="token keyword">from</span> <span class="token string">'vuex'</span>
<span class="token keyword">export</span> <span class="token keyword">default</span> <span class="token punctuation">{</span>
<span class="token comment" spellcheck="true">// ...</span>
computed<span class="token punctuation">:</span> <span class="token punctuation">{</span>
<span class="token comment" spellcheck="true">// getter를 객체 전파 연산자로 계산하여 추가합니다.</span>
<span class="token operator">...</span><span class="token function">mapGetters</span><span class="token punctuation">(</span><span class="token punctuation">[</span>
<span class="token string">'doneTodosCount'</span><span class="token punctuation">,</span>
<span class="token string">'anotherGetter'</span><span class="token punctuation">,</span>
<span class="token comment" spellcheck="true">// ...</span>
<span class="token punctuation">]</span><span class="token punctuation">)</span>
<span class="token punctuation">}</span>
<span class="token punctuation">}</span>
</code></pre>
<p>getter를 다른 이름으로 매핑하려면 객체를 사용합니다.</p>
<pre class="language-"><code class="lang-js"><span class="token operator">...</span><span class="token function">mapGetters</span><span class="token punctuation">(</span><span class="token punctuation">{</span>
<span class="token comment" spellcheck="true">// this.doneCount를 store.getters.doneTodosCount에 매핑하십시오.</span>
doneCount<span class="token punctuation">:</span> <span class="token string">'doneTodosCount'</span>
<span class="token punctuation">}</span><span class="token punctuation">)</span>
</code></pre>
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