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                                <h1 id="&#x30B2;&#x30C3;&#x30BF;&#x30FC;">&#x30B2;&#x30C3;&#x30BF;&#x30FC;</h1>
<p>&#x4F8B;&#x3048;&#x3070;&#x9805;&#x76EE;&#x306E;&#x30EA;&#x30B9;&#x30C8;&#x3092;&#x30D5;&#x30A3;&#x30EB;&#x30BF;&#x30EA;&#x30F3;&#x30B0;&#x3057;&#x305F;&#x308A;&#x30AB;&#x30A6;&#x30F3;&#x30C8;&#x3059;&#x308B;&#x3068;&#x304D;&#x306E;&#x3088;&#x3046;&#x306B;&#x3001;&#x30B9;&#x30C8;&#x30A2;&#x306E;&#x72B6;&#x614B;&#x3092;&#x7B97;&#x51FA;&#x3057;&#x305F;&#x3044;&#x3068;&#x304D;&#x304C;&#x3042;&#x308A;&#x307E;&#x3059;&#x3002;</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>&#x3082;&#x3057;&#x3053;&#x306E;&#x95A2;&#x6570;&#x3092;&#x8907;&#x6570;&#x306E;&#x30B3;&#x30F3;&#x30DD;&#x30FC;&#x30CD;&#x30F3;&#x30C8;&#x3067;&#x5229;&#x7528;&#x3057;&#x305F;&#x304F;&#x306A;&#x3063;&#x305F;&#x3089;&#x3001;&#x95A2;&#x6570;&#x3092;&#x30B3;&#x30D4;&#x30FC;&#x3059;&#x308B;&#x304B;&#x3001;&#x3042;&#x308B;&#x3044;&#x306F;&#x95A2;&#x6570;&#x3092;&#x5171;&#x7528;&#x306E;&#x30D8;&#x30EB;&#x30D1;&#x30FC;&#x306B;&#x5207;&#x308A;&#x51FA;&#x3057;&#x3066;&#x8907;&#x6570;&#x306E;&#x5834;&#x6240;&#x3067;&#x30A4;&#x30F3;&#x30DD;&#x30FC;&#x30C8;&#x3059;&#x308B;&#x5FC5;&#x8981;&#x304C;&#x3042;&#x308A;&#x307E;&#x3059;&#x3002;&#x3057;&#x304B;&#x3057;&#x3001;&#x3069;&#x3061;&#x3089;&#x3082;&#x7406;&#x60F3;&#x7684;&#x3068;&#x306F;&#x3044;&#x3048;&#x307E;&#x305B;&#x3093;&#x3002;</p>
<p>Vuex &#x3092;&#x5229;&#x7528;&#x3059;&#x308B;&#x3068;&#x30B9;&#x30C8;&#x30A2;&#x5185;&#x306B; &quot;&#x30B2;&#x30C3;&#x30BF;&#x30FC;&quot; &#x3092;&#x5B9A;&#x7FA9;&#x3059;&#x308B;&#x3053;&#x3068;&#x304C;&#x3067;&#x304D;&#x307E;&#x3059;&#x3002;&#x305D;&#x308C;&#x3089;&#x3092;&#x30B9;&#x30C8;&#x30A2;&#x306E;&#x7B97;&#x51FA;&#x30D7;&#x30ED;&#x30D1;&#x30C6;&#x30A3;&#x3068;&#x8003;&#x3048;&#x308B;&#x3053;&#x3068;&#x304C;&#x3067;&#x304D;&#x307E;&#x3059;&#x3002;&#x7B97;&#x51FA;&#x30D7;&#x30ED;&#x30D1;&#x30C6;&#x30A3;&#x3068;&#x540C;&#x69D8;&#x306B;&#x3001;&#x30B2;&#x30C3;&#x30BF;&#x30FC;&#x306E;&#x7D50;&#x679C;&#x306F;&#x305D;&#x306E;&#x4F9D;&#x5B58;&#x95A2;&#x4FC2;&#x306B;&#x57FA;&#x3065;&#x3044;&#x3066;&#x8A08;&#x7B97;&#x3055;&#x308C;&#x3001;&#x4F9D;&#x5B58;&#x95A2;&#x4FC2;&#x306E;&#x4E00;&#x90E8;&#x304C;&#x5909;&#x66F4;&#x3055;&#x308C;&#x305F;&#x3068;&#x304D;&#x306B;&#x306E;&#x307F;&#x518D;&#x8A55;&#x4FA1;&#x3055;&#x308C;&#x307E;&#x3059;&#x3002;</p>
<p>&#x30B2;&#x30C3;&#x30BF;&#x30FC;&#x306F;&#x7B2C;1&#x5F15;&#x6570;&#x3068;&#x3057;&#x3066;&#x3001;state &#x3092;&#x53D7;&#x3051;&#x53D6;&#x308A;&#x307E;&#x3059;:</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>
<h3 id="&#x30D7;&#x30ED;&#x30D1;&#x30C6;&#x30A3;&#x30B9;&#x30BF;&#x30A4;&#x30EB;&#x30A2;&#x30AF;&#x30BB;&#x30B9;">&#x30D7;&#x30ED;&#x30D1;&#x30C6;&#x30A3;&#x30B9;&#x30BF;&#x30A4;&#x30EB;&#x30A2;&#x30AF;&#x30BB;&#x30B9;</h3>
<p>&#x30B2;&#x30C3;&#x30BF;&#x30FC;&#x306F; <code>store.getters</code> &#x30AA;&#x30D6;&#x30B8;&#x30A7;&#x30AF;&#x30C8;&#x304B;&#x3089;&#x53D6;&#x308A;&#x51FA;&#x3055;&#x308C;&#x3001;&#x30D7;&#x30ED;&#x30D1;&#x30C6;&#x30A3;&#x3068;&#x3057;&#x3066;&#x30A2;&#x30AF;&#x30BB;&#x30B9;&#x3059;&#x308B;&#x3053;&#x3068;&#x304C;&#x3067;&#x304D;&#x307E;&#x3059;:</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>&#x30B2;&#x30C3;&#x30BF;&#x30FC;&#x306F;&#x7B2C;2&#x5F15;&#x6570;&#x3068;&#x3057;&#x3066;&#x4ED6;&#x306E;&#x30B2;&#x30C3;&#x30BF;&#x30FC;&#x3092;&#x53D7;&#x3051;&#x53D6;&#x308A;&#x307E;&#x3059;:</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>&#x3069;&#x306E;&#x30B3;&#x30F3;&#x30DD;&#x30FC;&#x30CD;&#x30F3;&#x30C8;&#x306E;&#x5185;&#x90E8;&#x3067;&#x3082;&#x7C21;&#x5358;&#x306B;&#x30B2;&#x30C3;&#x30BF;&#x30FC;&#x3092;&#x5229;&#x7528;&#x3059;&#x308B;&#x3053;&#x3068;&#x304C;&#x3067;&#x304D;&#x307E;&#x3059;:</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>
<p>&#x30D7;&#x30ED;&#x30D1;&#x30C6;&#x30A3;&#x3068;&#x3057;&#x3066;&#x30A2;&#x30AF;&#x30BB;&#x30B9;&#x3055;&#x308C;&#x308B;&#x30B2;&#x30C3;&#x30BF;&#x30FC;&#x306F; Vue &#x306E;&#x30EA;&#x30A2;&#x30AF;&#x30C6;&#x30A3;&#x30D6;&#x30B7;&#x30B9;&#x30C6;&#x30E0;&#x306E;&#x4E00;&#x90E8;&#x3068;&#x3057;&#x3066;&#x30AD;&#x30E3;&#x30C3;&#x30B7;&#x30E5;&#x3055;&#x308C;&#x308B;&#x3068;&#x3044;&#x3046;&#x70B9;&#x306B;&#x7559;&#x610F;&#x3057;&#x3066;&#x304F;&#x3060;&#x3055;&#x3044;&#x3002;</p>
<h3 id="&#x30E1;&#x30BD;&#x30C3;&#x30C9;&#x30B9;&#x30BF;&#x30A4;&#x30EB;&#x30A2;&#x30AF;&#x30BB;&#x30B9;">&#x30E1;&#x30BD;&#x30C3;&#x30C9;&#x30B9;&#x30BF;&#x30A4;&#x30EB;&#x30A2;&#x30AF;&#x30BB;&#x30B9;</h3>
<p>&#x95A2;&#x6570;&#x3092;&#x8FD4;&#x308A;&#x5024;&#x306B;&#x3059;&#x308B;&#x3053;&#x3068;&#x3067;&#x3001;&#x30B2;&#x30C3;&#x30BF;&#x30FC;&#x306B;&#x5F15;&#x6570;&#x3092;&#x6E21;&#x3059;&#x3053;&#x3068;&#x3082;&#x3067;&#x304D;&#x307E;&#x3059;&#x3002;&#x3053;&#x308C;&#x306F;&#x7279;&#x306B;&#x30B9;&#x30C8;&#x30A2;&#x306E;&#x4E2D;&#x306E;&#x914D;&#x5217;&#x3092;&#x691C;&#x7D22;&#x3059;&#x308B;&#x6642;&#x306B;&#x5F79;&#x7ACB;&#x3061;&#x307E;&#x3059;&#xFF1A;</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>
  getTodoById<span class="token punctuation">:</span> <span class="token punctuation">(</span>state<span class="token punctuation">)</span> <span class="token operator">=</span><span class="token operator">&gt;</span> <span class="token punctuation">(</span>id<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> state<span class="token punctuation">.</span>todos<span class="token punctuation">.</span><span class="token function">find</span><span class="token punctuation">(</span>todo <span class="token operator">=</span><span class="token operator">&gt;</span> todo<span class="token punctuation">.</span>id <span class="token operator">===</span> id<span class="token punctuation">)</span>
  <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><span class="token function">getTodoById</span><span class="token punctuation">(</span><span class="token number">2</span><span class="token punctuation">)</span> <span class="token comment" spellcheck="true">// -&gt; { id: 2, text: &apos;...&apos;, done: false }</span>
</code></pre>
<p>&#x30E1;&#x30BD;&#x30C3;&#x30C9;&#x306B;&#x3088;&#x3063;&#x3066;&#x30A2;&#x30AF;&#x30BB;&#x30B9;&#x3055;&#x308C;&#x308B;&#x30B2;&#x30C3;&#x30BF;&#x30FC;&#x306F;&#x547C;&#x3073;&#x51FA;&#x3059;&#x5EA6;&#x306B;&#x5B9F;&#x884C;&#x3055;&#x308C;&#x3001;&#x305D;&#x306E;&#x7D50;&#x679C;&#x306F;&#x30AD;&#x30E3;&#x30C3;&#x30B7;&#x30E5;&#x3055;&#x308C;&#x306A;&#x3044;&#x70B9;&#x306B;&#x7559;&#x610F;&#x3057;&#x3066;&#x304F;&#x3060;&#x3055;&#x3044;&#x3002;</p>
<h3 id="mapgetters-&#x30D8;&#x30EB;&#x30D1;&#x30FC;"><code>mapGetters</code> &#x30D8;&#x30EB;&#x30D1;&#x30FC;</h3>
<p><code>mapGetters</code> &#x30D8;&#x30EB;&#x30D1;&#x30FC;&#x306F;&#x30B9;&#x30C8;&#x30A2;&#x306E;&#x30B2;&#x30C3;&#x30BF;&#x30FC;&#x3092;&#x30ED;&#x30FC;&#x30AB;&#x30EB;&#x306E;&#x7B97;&#x51FA;&#x30D7;&#x30ED;&#x30D1;&#x30C6;&#x30A3;&#x306B;&#x30DE;&#x30C3;&#x30D4;&#x30F3;&#x30B0;&#x3055;&#x305B;&#x307E;&#x3059;:</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">// &#x30B2;&#x30C3;&#x30BF;&#x30FC;&#x3092;&#x3001;&#x30B9;&#x30D7;&#x30EC;&#x30C3;&#x30C9;&#x6F14;&#x7B97;&#x5B50;&#xFF08;object spread operator&#xFF09;&#x3092;&#x4F7F;&#x3063;&#x3066; computed &#x306B;&#x7D44;&#x307F;&#x8FBC;&#x3080;</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>&#x30B2;&#x30C3;&#x30BF;&#x30FC;&#x3092;&#x7570;&#x306A;&#x308B;&#x540D;&#x524D;&#x3067;&#x30DE;&#x30C3;&#x30D4;&#x30F3;&#x30B0;&#x3055;&#x305B;&#x305F;&#x3044;&#x3068;&#x304D;&#x306F;&#x30AA;&#x30D6;&#x30B8;&#x30A7;&#x30AF;&#x30C8;&#x3092;&#x4F7F;&#x3044;&#x307E;&#x3059;:</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` &#x3092; `store.getters.doneTodosCount` &#x306B;&#x30DE;&#x30C3;&#x30D4;&#x30F3;&#x30B0;&#x3055;&#x305B;&#x308B;</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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