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                                <h1 id="muta&#xE7;&#xF5;es">Muta&#xE7;&#xF5;es</h1>
<p>A &#xFA;nica maneira de mudar o estado em uma <em>store</em>  Vuex &#xE9; fazendo <em>commit</em>  de uma muta&#xE7;&#xE3;o. As muta&#xE7;&#xF5;es Vuex s&#xE3;o muito semelhantes aos eventos: cada muta&#xE7;&#xE3;o possui uma string <strong> tipo </strong> e um <strong> manipulador </strong>. A fun&#xE7;&#xE3;o do manipulador &#xE9; onde n&#xF3;s executamos modifica&#xE7;&#xF5;es de estado reais e receber&#xE1; o estado como o primeiro argumento:</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>
    count<span class="token punctuation">:</span> <span class="token number">1</span>
  <span class="token punctuation">}</span><span class="token punctuation">,</span>
  mutations<span class="token punctuation">:</span> <span class="token punctuation">{</span>
    increment <span class="token punctuation">(</span>state<span class="token punctuation">)</span> <span class="token punctuation">{</span>
      <span class="token comment" spellcheck="true">// muda o estado</span>
      state<span class="token punctuation">.</span>count<span class="token operator">++</span>
    <span class="token punctuation">}</span>
  <span class="token punctuation">}</span>
<span class="token punctuation">}</span><span class="token punctuation">)</span>
</code></pre>
<p>Voc&#xEA; n&#xE3;o pode chamar diretamente um manipulador de muta&#xE7;&#xE3;o. Pense nisso mais como registro de eventos: &quot;Quando uma muta&#xE7;&#xE3;o com tipo <code>incremento</code> &#xE9; ativada, chame esse manipulador.&quot; Para invocar um manipulador de muta&#xE7;&#xE3;o, voc&#xEA; precisa chamar <code>store.commit</code> com seu tipo:</p>
<pre class="language-"><code class="lang-js">store<span class="token punctuation">.</span><span class="token function">commit</span><span class="token punctuation">(</span><span class="token string">&apos;increment&apos;</span><span class="token punctuation">)</span>
</code></pre>
<h3 id="commit-com-payload">Commit com payload</h3>
<p>Voc&#xEA; pode passar um argumento adicional para <code>store.commit</code>, que &#xE9; chamado de <strong> payload </strong> para a muta&#xE7;&#xE3;o:</p>
<pre class="language-"><code class="lang-js"><span class="token comment" spellcheck="true">// ...</span>
mutations<span class="token punctuation">:</span> <span class="token punctuation">{</span>
  increment <span class="token punctuation">(</span>state<span class="token punctuation">,</span> n<span class="token punctuation">)</span> <span class="token punctuation">{</span>
    state<span class="token punctuation">.</span>count <span class="token operator">+</span><span class="token operator">=</span> n
  <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><span class="token function">commit</span><span class="token punctuation">(</span><span class="token string">&apos;increment&apos;</span><span class="token punctuation">,</span> <span class="token number">10</span><span class="token punctuation">)</span>
</code></pre>
<p>Na maioria dos casos, o payload deve ser um objeto para que ele possa conter v&#xE1;rios campos e a muta&#xE7;&#xE3;o gravada tamb&#xE9;m ser&#xE1; mais descritiva:</p>
<pre class="language-"><code class="lang-js"><span class="token comment" spellcheck="true">// ...</span>
mutations<span class="token punctuation">:</span> <span class="token punctuation">{</span>
  increment <span class="token punctuation">(</span>state<span class="token punctuation">,</span> payload<span class="token punctuation">)</span> <span class="token punctuation">{</span>
    state<span class="token punctuation">.</span>count <span class="token operator">+</span><span class="token operator">=</span> payload<span class="token punctuation">.</span>amount
  <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><span class="token function">commit</span><span class="token punctuation">(</span><span class="token string">&apos;increment&apos;</span><span class="token punctuation">,</span> <span class="token punctuation">{</span>
  amount<span class="token punctuation">:</span> <span class="token number">10</span>
<span class="token punctuation">}</span><span class="token punctuation">)</span>
</code></pre>
<h3 id="commit-com-object-style">Commit com Object-Style</h3>
<p>Uma maneira alternativa de confirmar uma muta&#xE7;&#xE3;o &#xE9; usando diretamente um objeto que possui uma propriedade <code>type</code>:</p>
<pre class="language-"><code class="lang-js">store<span class="token punctuation">.</span><span class="token function">commit</span><span class="token punctuation">(</span><span class="token punctuation">{</span>
  type<span class="token punctuation">:</span> <span class="token string">&apos;increment&apos;</span><span class="token punctuation">,</span>
  amount<span class="token punctuation">:</span> <span class="token number">10</span>
<span class="token punctuation">}</span><span class="token punctuation">)</span>
</code></pre>
<p>Ao fazer um <em>commit</em>  com object-style, todo o objeto ser&#xE1; passado como payload para os manipuladores de muta&#xE7;&#xE3;o, de modo que o manipulador permane&#xE7;a o mesmo:</p>
<pre class="language-"><code class="lang-js">mutations<span class="token punctuation">:</span> <span class="token punctuation">{</span>
  increment <span class="token punctuation">(</span>state<span class="token punctuation">,</span> payload<span class="token punctuation">)</span> <span class="token punctuation">{</span>
    state<span class="token punctuation">.</span>count <span class="token operator">+</span><span class="token operator">=</span> payload<span class="token punctuation">.</span>amount
  <span class="token punctuation">}</span>
<span class="token punctuation">}</span>
</code></pre>
<h3 id="muta&#xE7;&#xF5;es-seguem-as-regras-de-reatividade-do-vue">Muta&#xE7;&#xF5;es seguem as regras de reatividade do Vue</h3>
<p>Uma vez que o estado de uma <em>store</em>  Vuex &#xE9; reativo para o Vue, quando mutar o estado, os componentes Vue que observam o estado ser&#xE3;o atualizados automaticamente. Isso tamb&#xE9;m significa que as muta&#xE7;&#xF5;es Vuex est&#xE3;o sujeitas &#xE0;s mesmas ressalvas de reatividade quando se trabalha com apenas Vue:</p>
<ol>
<li><p>Prefira inicializar o estado inicial da sua <em>store</em>  com todos os campos desejados antecipadamente.</p>
</li>
<li><p>Ao adicionar novas propriedades a um objeto, voc&#xEA; deve:</p>
<ul>
<li>Use <code>Vue.set(obj, &apos;newProp&apos;, 123)</code>, ou</li>
</ul>
</li>
</ol>
<ul>
<li>Substitua esse Objeto por um novo. Por exemplo, usando o est&#xE1;gio 3 <a href="https://github.com/sebmarkbage/ecmascript-rest-restpread" target="_blank">object spread syntax</a>, podemos grav&#xE1;-lo assim:</li>
</ul>
<pre class="language-"><code>``` js
state.obj = { ...state.obj, newProp: 123 }
```
</code></pre><h3 id="usando-constantes-para-tipos-de-muta&#xE7;&#xE3;o">Usando Constantes para Tipos de Muta&#xE7;&#xE3;o</h3>
<p>&#xC9; um padr&#xE3;o normalmente visto para usar constantes para tipos de muta&#xE7;&#xE3;o em v&#xE1;rias implementa&#xE7;&#xF5;es de Flux. Isso permite que o c&#xF3;digo aproveite ferramentas como linters e colocar todas as constantes em um &#xFA;nico arquivo permite que seus colaboradores tenham uma vis&#xE3;o r&#xE1;pida de quais muta&#xE7;&#xF5;es s&#xE3;o poss&#xED;veis em todo o aplicativo:</p>
<pre class="language-"><code class="lang-js"><span class="token comment" spellcheck="true">// mutation-types.js</span>
<span class="token keyword">export</span> <span class="token keyword">const</span> SOME_MUTATION <span class="token operator">=</span> <span class="token string">&apos;SOME_MUTATION&apos;</span>
</code></pre>
<pre class="language-"><code class="lang-js"><span class="token comment" spellcheck="true">// store.js</span>
<span class="token keyword">import</span> Vuex <span class="token keyword">from</span> <span class="token string">&apos;vuex&apos;</span>
<span class="token keyword">import</span> <span class="token punctuation">{</span> SOME_MUTATION <span class="token punctuation">}</span> <span class="token keyword">from</span> <span class="token string">&apos;./mutation-types&apos;</span>

<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> <span class="token operator">...</span> <span class="token punctuation">}</span><span class="token punctuation">,</span>
  mutations<span class="token punctuation">:</span> <span class="token punctuation">{</span>
    <span class="token comment" spellcheck="true">// podemos usar o recurso de dado computado do ES2015</span>
    <span class="token comment" spellcheck="true">// usar uma constante como o nome da fun&#xE7;&#xE3;o</span>
    <span class="token punctuation">[</span>SOME_MUTATION<span class="token punctuation">]</span> <span class="token punctuation">(</span>state<span class="token punctuation">)</span> <span class="token punctuation">{</span>
      <span class="token comment" spellcheck="true">// mutate state</span>
    <span class="token punctuation">}</span>
  <span class="token punctuation">}</span>
<span class="token punctuation">}</span><span class="token punctuation">)</span>
</code></pre>
<p>Querer usar constantes &#xE9; ,em grande parte, uma prefer&#xEA;ncia - pode ser &#xFA;til em grandes projetos com muitos desenvolvedores, mas &#xE9; totalmente opcional se voc&#xEA; n&#xE3;o gosta deles.</p>
<h3 id="muta&#xE7;&#xF5;es-devem-ser-s&#xED;ncronas">Muta&#xE7;&#xF5;es devem ser s&#xED;ncronas</h3>
<p>Uma regra importante a lembrar &#xE9; que <strong> as fun&#xE7;&#xF5;es do manipulador de muta&#xE7;&#xE3;o devem ser s&#xED;ncronas </strong>. Por qu&#xEA;? Considere o seguinte exemplo:</p>
<pre class="language-"><code class="lang-js">mutations<span class="token punctuation">:</span> <span class="token punctuation">{</span>
  someMutation <span class="token punctuation">(</span>state<span class="token punctuation">)</span> <span class="token punctuation">{</span>
    api<span class="token punctuation">.</span><span class="token function">callAsyncMethod</span><span class="token punctuation">(</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=</span><span class="token operator">&gt;</span> <span class="token punctuation">{</span>
      state<span class="token punctuation">.</span>count<span class="token operator">++</span>
    <span class="token punctuation">}</span><span class="token punctuation">)</span>
  <span class="token punctuation">}</span>
<span class="token punctuation">}</span>
</code></pre>
<p>Agora imagine que estamos depurando o aplicativo e observamos os registros de muta&#xE7;&#xE3;o do devtool. Para cada muta&#xE7;&#xE3;o registrada, o devtool precisar&#xE1; capturar &quot;antes&quot; e &quot;depois&quot; <em>snapshots</em>  do estado. No entanto, o retorno de chamada ass&#xED;ncrono dentro da muta&#xE7;&#xE3;o de exemplo acima torna isso imposs&#xED;vel: o <em>callback</em>  ainda n&#xE3;o foi chamado quando a muta&#xE7;&#xE3;o foi comitada, e n&#xE3;o existe nenhuma maneira para o devtool saber quando o <em>callback</em>  ser&#xE1; chamado - qualquer muta&#xE7;&#xE3;o de estado realizada no retorno desse <em>callback</em>  &#xE9; essencialmente n&#xE3;o rastre&#xE1;vel!</p>
<h3 id="fazendo-commit-de-muta&#xE7;&#xF5;es-em-componente">Fazendo commit de Muta&#xE7;&#xF5;es em Componente</h3>
<p>Voc&#xEA; pode fazer um commit de muta&#xE7;&#xF5;es em componentes com <code>this.$store.commit(&apos;xxx&apos;)</code>, ou use o auxiliar <code>mapMutations</code> que mapeia m&#xE9;todos de componente para chamadas<code>store.commit</code> (requer a inje&#xE7;&#xE3;o root <code>store</code>):</p>
<pre class="language-"><code class="lang-js"><span class="token keyword">import</span> <span class="token punctuation">{</span> mapMutations <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>
  methods<span class="token punctuation">:</span> <span class="token punctuation">{</span>
    <span class="token operator">...</span><span class="token function">mapMutations</span><span class="token punctuation">(</span><span class="token punctuation">[</span>
      <span class="token string">&apos;increment&apos;</span><span class="token punctuation">,</span> <span class="token comment" spellcheck="true">// mapeia `this.increment()` para `this.$store.commit(&apos;increment&apos;)`</span>

      <span class="token comment" spellcheck="true">// `mapMutations` tamb&#xE9;m suporta payloads:</span>
      <span class="token string">&apos;incrementBy&apos;</span> <span class="token comment" spellcheck="true">// mapeia `this.incrementBy(amount)` para `this.$store.commit(&apos;incrementBy&apos;, amount)`</span>
    <span class="token punctuation">]</span><span class="token punctuation">)</span><span class="token punctuation">,</span>
    <span class="token operator">...</span><span class="token function">mapMutations</span><span class="token punctuation">(</span><span class="token punctuation">{</span>
      add<span class="token punctuation">:</span> <span class="token string">&apos;increment&apos;</span> <span class="token comment" spellcheck="true">// mapeia `this.add()` para `this.$store.commit(&apos;increment&apos;)`</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="a&#xE7;&#xF5;es">A&#xE7;&#xF5;es</h3>
<p>Assincronicidade combinada com a muta&#xE7;&#xE3;o do estado pode tornar o seu programa muito dif&#xED;cil de acontecer. Por exemplo, quando voc&#xEA; chama dois m&#xE9;todos com retrocessos ass&#xED;ncronos que mutam o estado, como voc&#xEA; sabe quando eles s&#xE3;o chamados e qual callback foi chamado primeiro? &#xC9; exatamente por isso que queremos separar os dois conceitos. No Vuex, as muta&#xE7;&#xF5;es <strong> s&#xE3;o transa&#xE7;&#xF5;es s&#xED;ncronas </strong>:</p>
<pre class="language-"><code class="lang-js">store<span class="token punctuation">.</span><span class="token function">commit</span><span class="token punctuation">(</span><span class="token string">&apos;increment&apos;</span><span class="token punctuation">)</span>
<span class="token comment" spellcheck="true">// qualquer altera&#xE7;&#xE3;o de estado que a muta&#xE7;&#xE3;o &quot;incrementar&quot; possa causar</span>
<span class="token comment" spellcheck="true">// deve ser feita neste momento</span>
</code></pre>
<p>Para lidar com opera&#xE7;&#xF5;es ass&#xED;ncronas, vamos apresentar as <a href="actions.html">A&#xE7;&#xF5;es</a>.</p>

                                
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