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                                <h1 id="getters">Getters</h1>
<p>&#xB54C;&#xB85C;&#xB294; &#xC800;&#xC7A5;&#xC18C; &#xC0C1;&#xD0DC;&#xB97C; &#xAE30;&#xBC18;&#xD558;&#xB294; &#xC0C1;&#xD0DC;&#xB97C; &#xACC4;&#xC0B0;&#xD574;&#xC57C; &#xD560; &#xC218;&#xB3C4; &#xC788;&#xC2B5;&#xB2C8;&#xB2E4;.(&#xC608;: &#xC544;&#xC774;&#xD15C; &#xB9AC;&#xC2A4;&#xD2B8;&#xB97C; &#xD544;&#xD130;&#xB9C1;&#xD558;&#xACE0; &#xACC4;&#xC0B0;)</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">&gt;</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>&#xB458; &#xC774;&#xC0C1;&#xC758; &#xCEF4;&#xD3EC;&#xB10C;&#xD2B8;&#xAC00; &#xC774;&#xB97C; &#xC0AC;&#xC6A9; &#xD574;&#xC57C;&#xD558;&#xB294; &#xACBD;&#xC6B0; &#xD568;&#xC218;&#xB97C; &#xBCF5;&#xC81C;&#xD558;&#xAC70;&#xB098; &#xACF5;&#xC720;&#xB41C; &#xD5EC;&#xD37C;&#xB97C; &#xCD94;&#xCD9C;&#xD558;&#xC5EC; &#xC5EC;&#xB7EC; &#xC704;&#xCE58;&#xC5D0;&#xC11C; &#xAC00;&#xC838;&#xC640;&#xC57C;&#xD569;&#xB2C8;&#xB2E4;. &#xB458; &#xB2E4; &#xC774;&#xC0C1;&#xC801;&#xC774;&#xC9C0; &#xC54A;&#xC2B5;&#xB2C8;&#xB2E4;.</p>
<p>Vuex&#xB97C; &#xC0AC;&#xC6A9;&#xD558;&#xBA74; &#xC800;&#xC7A5;&#xC18C;&#xC5D0;&#xC11C; &quot;getters&quot;&#xB97C; &#xC815;&#xC758; &#xD560; &#xC218; &#xC788;&#xC2B5;&#xB2C8;&#xB2E4;(&#xC800;&#xC7A5;&#xC18C;&#xC758; &#xACC4;&#xC0B0;&#xB41C; &#xC18D;&#xC131;&#xC73C;&#xB85C; &#xC0DD;&#xAC01;&#xB429;&#xB2C8;&#xB2E4;). Getters&#xB294; &#xCCAB; &#xBC88;&#xC9F8; &#xC804;&#xB2EC;&#xC778;&#xC790;&#xB85C; &#xC0C1;&#xD0DC;&#xB97C; &#xBC1B;&#xC2B5;&#xB2C8;&#xB2E4;.</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">&apos;...&apos;</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">&apos;...&apos;</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">&gt;</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">&gt;</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>getters&#xB294; <code>store.getters</code> &#xAC1D;&#xCCB4;&#xC5D0; &#xB178;&#xCD9C; &#xB429;&#xB2C8;&#xB2E4;.</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">// -&gt; [{ id: 1, text: &apos;...&apos;, done: true }]</span>
</code></pre>
<p>Getters&#xB294; &#xB450; &#xBC88;&#xC9F8; &#xC804;&#xB2EC;&#xC778;&#xC790;&#xB85C; &#xB2E4;&#xB978; getter&#xB3C4; &#xBC1B;&#xAC8C;&#xB429;&#xB2C8;&#xB2E4;.</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">&gt;</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">// -&gt; 1</span>
</code></pre>
<p>&#xC774;&#xC81C; &#xBAA8;&#xB4E0; &#xCEF4;&#xD3EC;&#xB10C;&#xD2B8;&#xC5D0;&#xC11C; &#xC27D;&#xAC8C; &#xC0AC;&#xC6A9;&#xD560; &#xC218; &#xC788;&#xC2B5;&#xB2C8;&#xB2E4;.</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-&#xD5EC;&#xD37C;"><code>mapGetters</code> &#xD5EC;&#xD37C;</h3>
<p><code>mapGetters</code> &#xD5EC;&#xD37C;&#xB294; &#xC800;&#xC7A5;&#xC18C; getter&#xB97C; &#xB85C;&#xCEEC; &#xACC4;&#xC0B0;&#xB41C; &#xC18D;&#xC131;&#xC5D0; &#xB9E4;&#xD551;&#xD569;&#xB2C8;&#xB2E4;.</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">&apos;vuex&apos;</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">// getter&#xB97C; &#xAC1D;&#xCCB4; &#xC804;&#xAC1C; &#xC5F0;&#xC0B0;&#xC790;(Object Spread Operator)&#xB85C; &#xACC4;&#xC0B0;&#xD558;&#xC5EC; &#xCD94;&#xAC00;&#xD569;&#xB2C8;&#xB2E4;.</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">&apos;doneTodosCount&apos;</span><span class="token punctuation">,</span>
      <span class="token string">&apos;anotherGetter&apos;</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>getter&#xB97C; &#xB2E4;&#xB978; &#xC774;&#xB984;&#xC73C;&#xB85C; &#xB9E4;&#xD551;&#xD558;&#xB824;&#xBA74; &#xAC1D;&#xCCB4;&#xB97C; &#xC0AC;&#xC6A9;&#xD569;&#xB2C8;&#xB2E4;.</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.doneCount&#xB97C; store.getters.doneTodosCount&#xC5D0; &#xB9E4;&#xD551;&#xD558;&#xC2ED;&#xC2DC;&#xC624;.</span>
  doneCount<span class="token punctuation">:</span> <span class="token string">&apos;doneTodosCount&apos;</span>
<span class="token punctuation">}</span><span class="token punctuation">)</span>
</code></pre>

                                
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