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    <title>DEV Community: Determinado 96</title>
    <description>The latest articles on DEV Community by Determinado 96 (@determinado96).</description>
    <link>https://dev.to/determinado96</link>
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      <title>DEV Community: Determinado 96</title>
      <link>https://dev.to/determinado96</link>
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    <item>
      <title>Um resumo sobre o padrão de projeto Adapter</title>
      <dc:creator>Determinado 96</dc:creator>
      <pubDate>Tue, 07 Apr 2026 17:46:13 +0000</pubDate>
      <link>https://dev.to/determinado96/um-resumo-sobre-o-padrao-de-projeto-adapter-1mh8</link>
      <guid>https://dev.to/determinado96/um-resumo-sobre-o-padrao-de-projeto-adapter-1mh8</guid>
      <description>&lt;h2&gt;
  
  
  Analogia
&lt;/h2&gt;

&lt;p&gt;Imagine que você tem um carregador de celular 🇧🇷 (tomada brasileira), mas viajou para os Estados Unidos 🇺🇸 e lá a tomada é diferente.&lt;/p&gt;

&lt;ul&gt;
&lt;li&gt;O carregador funciona&lt;/li&gt;
&lt;li&gt;A energia funciona&lt;/li&gt;
&lt;li&gt;Mas… eles não encaixam!&lt;/li&gt;
&lt;/ul&gt;

&lt;h2&gt;
  
  
  O que você faz?
&lt;/h2&gt;

&lt;p&gt;Você usa um adaptador de tomada. Esse adaptador não muda o carregador nem a tomada — ele só faz os dois conseguirem se conectar (faz uma tradução).&lt;/p&gt;

&lt;p&gt;O Adapter faz duas coisas que não são compatíveis conseguirem trabalhar juntas.&lt;/p&gt;

&lt;h2&gt;
  
  
  Exemplo simples
&lt;/h2&gt;



&lt;div class="highlight js-code-highlight"&gt;
&lt;pre class="highlight javascript"&gt;&lt;code&gt;&lt;span class="nf"&gt;pagar&lt;/span&gt;&lt;span class="p"&gt;(&lt;/span&gt;&lt;span class="nx"&gt;valor&lt;/span&gt;&lt;span class="p"&gt;)&lt;/span&gt; &lt;span class="c1"&gt;// sistema espera algo assim (tomada us)&lt;/span&gt;

&lt;span class="nf"&gt;fazerPagamento&lt;/span&gt;&lt;span class="p"&gt;(&lt;/span&gt;&lt;span class="nx"&gt;valor&lt;/span&gt;&lt;span class="p"&gt;)&lt;/span&gt; &lt;span class="c1"&gt;// você tem algo assim (tomara 🇧🇷)&lt;/span&gt;

&lt;span class="c1"&gt;// o adapter faz as duas coisas que não são compatíveis conseguirem trabalhar&lt;/span&gt;
&lt;span class="kd"&gt;class&lt;/span&gt; &lt;span class="nc"&gt;AdapterPagamento&lt;/span&gt; &lt;span class="p"&gt;{&lt;/span&gt;
  &lt;span class="nf"&gt;constructor&lt;/span&gt;&lt;span class="p"&gt;(&lt;/span&gt;&lt;span class="nx"&gt;servico&lt;/span&gt;&lt;span class="p"&gt;)&lt;/span&gt; &lt;span class="p"&gt;{&lt;/span&gt;
    &lt;span class="k"&gt;this&lt;/span&gt;&lt;span class="p"&gt;.&lt;/span&gt;&lt;span class="nx"&gt;servico&lt;/span&gt; &lt;span class="o"&gt;=&lt;/span&gt; &lt;span class="nx"&gt;servico&lt;/span&gt;&lt;span class="p"&gt;;&lt;/span&gt;
  &lt;span class="p"&gt;}&lt;/span&gt;

  &lt;span class="nf"&gt;pagar&lt;/span&gt;&lt;span class="p"&gt;(&lt;/span&gt;&lt;span class="nx"&gt;valor&lt;/span&gt;&lt;span class="p"&gt;)&lt;/span&gt; &lt;span class="p"&gt;{&lt;/span&gt;
    &lt;span class="k"&gt;this&lt;/span&gt;&lt;span class="p"&gt;.&lt;/span&gt;&lt;span class="nx"&gt;servico&lt;/span&gt;&lt;span class="p"&gt;.&lt;/span&gt;&lt;span class="nf"&gt;fazerPagamento&lt;/span&gt;&lt;span class="p"&gt;(&lt;/span&gt;&lt;span class="nx"&gt;valor&lt;/span&gt;&lt;span class="p"&gt;);&lt;/span&gt;
  &lt;span class="p"&gt;}&lt;/span&gt;
&lt;span class="p"&gt;}&lt;/span&gt;
&lt;/code&gt;&lt;/pre&gt;

&lt;/div&gt;



&lt;h2&gt;
  
  
  O Adapter pode ser bidirecional?
&lt;/h2&gt;

&lt;p&gt;Na maioria dos casos, você só precisa de uma direção:&lt;/p&gt;

&lt;ul&gt;
&lt;li&gt;Sistema → Adapter → Código existente&lt;/li&gt;
&lt;/ul&gt;

&lt;p&gt;Porque existe um lado dominante (o sistema que define o padrão).&lt;/p&gt;

&lt;h2&gt;
  
  
  Quando vira bidirecional?
&lt;/h2&gt;

&lt;p&gt;Quando você tem dois sistemas que precisam conversar entre si, e cada um fala um idioma” diferente.&lt;/p&gt;

&lt;ul&gt;
&lt;li&gt;Sistema A usa: pagar(valor)&lt;/li&gt;
&lt;li&gt;Sistema B usa: fazerPagamento(valor)&lt;/li&gt;
&lt;li&gt;A → B precisa de um Adapter&lt;/li&gt;
&lt;li&gt;B → A precisa de outro Adapter&lt;/li&gt;
&lt;/ul&gt;

&lt;h2&gt;
  
  
  Exemplo completo
&lt;/h2&gt;

&lt;p&gt;&lt;a href="https://github.com/determinado96/Design-patterns/blob/main/src/structural/adapter/index.ts" rel="noopener noreferrer"&gt;https://github.com/determinado96/Design-patterns/blob/main/src/structural/adapter/index.ts&lt;/a&gt;&lt;/p&gt;

</description>
      <category>architecture</category>
      <category>beginners</category>
      <category>design</category>
      <category>javascript</category>
    </item>
    <item>
      <title>Um resumo sobre coesão e SRP</title>
      <dc:creator>Determinado 96</dc:creator>
      <pubDate>Mon, 06 Apr 2026 17:23:09 +0000</pubDate>
      <link>https://dev.to/determinado96/um-resumo-sobre-coesao-e-srp-gf6</link>
      <guid>https://dev.to/determinado96/um-resumo-sobre-coesao-e-srp-gf6</guid>
      <description>&lt;h2&gt;
  
  
  O que é uma classe coesa?
&lt;/h2&gt;

&lt;p&gt;Uma classe coesa é aquela que tem apenas uma responsabilidade.&lt;br&gt;
Classes coesas são menores, mais organizadas, fáceis de manter e reutilizar.&lt;/p&gt;

&lt;h2&gt;
  
  
  Exemplo de classe com baixa coesão
&lt;/h2&gt;



&lt;div class="highlight js-code-highlight"&gt;
&lt;pre class="highlight javascript"&gt;&lt;code&gt;&lt;span class="kd"&gt;class&lt;/span&gt; &lt;span class="nc"&gt;CalculadoraDeSalario&lt;/span&gt; &lt;span class="p"&gt;{&lt;/span&gt;
  &lt;span class="nf"&gt;calcula&lt;/span&gt;&lt;span class="p"&gt;(&lt;/span&gt;&lt;span class="nx"&gt;funcionario&lt;/span&gt;&lt;span class="p"&gt;)&lt;/span&gt; &lt;span class="p"&gt;{&lt;/span&gt;
    &lt;span class="k"&gt;if &lt;/span&gt;&lt;span class="p"&gt;(&lt;/span&gt;&lt;span class="nx"&gt;funcionario&lt;/span&gt;&lt;span class="p"&gt;.&lt;/span&gt;&lt;span class="nx"&gt;cargo&lt;/span&gt; &lt;span class="o"&gt;===&lt;/span&gt; &lt;span class="dl"&gt;"&lt;/span&gt;&lt;span class="s2"&gt;DESENVOLVEDOR&lt;/span&gt;&lt;span class="dl"&gt;"&lt;/span&gt;&lt;span class="p"&gt;)&lt;/span&gt; &lt;span class="p"&gt;{&lt;/span&gt;
      &lt;span class="k"&gt;return&lt;/span&gt; &lt;span class="k"&gt;this&lt;/span&gt;&lt;span class="p"&gt;.&lt;/span&gt;&lt;span class="nf"&gt;dezOuVintePorcento&lt;/span&gt;&lt;span class="p"&gt;(&lt;/span&gt;&lt;span class="nx"&gt;funcionario&lt;/span&gt;&lt;span class="p"&gt;);&lt;/span&gt;
    &lt;span class="p"&gt;}&lt;/span&gt;

    &lt;span class="k"&gt;if &lt;/span&gt;&lt;span class="p"&gt;(&lt;/span&gt;&lt;span class="nx"&gt;funcionario&lt;/span&gt;&lt;span class="p"&gt;.&lt;/span&gt;&lt;span class="nx"&gt;cargo&lt;/span&gt; &lt;span class="o"&gt;===&lt;/span&gt; &lt;span class="dl"&gt;"&lt;/span&gt;&lt;span class="s2"&gt;DBA&lt;/span&gt;&lt;span class="dl"&gt;"&lt;/span&gt; &lt;span class="o"&gt;||&lt;/span&gt; &lt;span class="nx"&gt;funcionario&lt;/span&gt;&lt;span class="p"&gt;.&lt;/span&gt;&lt;span class="nx"&gt;cargo&lt;/span&gt; &lt;span class="o"&gt;===&lt;/span&gt; &lt;span class="dl"&gt;"&lt;/span&gt;&lt;span class="s2"&gt;TESTER&lt;/span&gt;&lt;span class="dl"&gt;"&lt;/span&gt;&lt;span class="p"&gt;)&lt;/span&gt; &lt;span class="p"&gt;{&lt;/span&gt;
      &lt;span class="k"&gt;return&lt;/span&gt; &lt;span class="k"&gt;this&lt;/span&gt;&lt;span class="p"&gt;.&lt;/span&gt;&lt;span class="nf"&gt;quinzeOuVinteCincoPorcento&lt;/span&gt;&lt;span class="p"&gt;(&lt;/span&gt;&lt;span class="nx"&gt;funcionario&lt;/span&gt;&lt;span class="p"&gt;);&lt;/span&gt;
    &lt;span class="p"&gt;}&lt;/span&gt;

    &lt;span class="k"&gt;throw&lt;/span&gt; &lt;span class="k"&gt;new&lt;/span&gt; &lt;span class="nc"&gt;Error&lt;/span&gt;&lt;span class="p"&gt;(&lt;/span&gt;&lt;span class="dl"&gt;"&lt;/span&gt;&lt;span class="s2"&gt;Funcionário inválido&lt;/span&gt;&lt;span class="dl"&gt;"&lt;/span&gt;&lt;span class="p"&gt;);&lt;/span&gt;
  &lt;span class="p"&gt;}&lt;/span&gt;

  &lt;span class="nf"&gt;dezOuVintePorcento&lt;/span&gt;&lt;span class="p"&gt;(&lt;/span&gt;&lt;span class="nx"&gt;funcionario&lt;/span&gt;&lt;span class="p"&gt;)&lt;/span&gt; &lt;span class="p"&gt;{&lt;/span&gt;
    &lt;span class="k"&gt;if &lt;/span&gt;&lt;span class="p"&gt;(&lt;/span&gt;&lt;span class="nx"&gt;funcionario&lt;/span&gt;&lt;span class="p"&gt;.&lt;/span&gt;&lt;span class="nx"&gt;salarioBase&lt;/span&gt; &lt;span class="o"&gt;&amp;gt;&lt;/span&gt; &lt;span class="mi"&gt;3000&lt;/span&gt;&lt;span class="p"&gt;)&lt;/span&gt; &lt;span class="p"&gt;{&lt;/span&gt;
      &lt;span class="k"&gt;return&lt;/span&gt; &lt;span class="nx"&gt;funcionario&lt;/span&gt;&lt;span class="p"&gt;.&lt;/span&gt;&lt;span class="nx"&gt;salarioBase&lt;/span&gt; &lt;span class="o"&gt;*&lt;/span&gt; &lt;span class="mf"&gt;0.8&lt;/span&gt;&lt;span class="p"&gt;;&lt;/span&gt;
    &lt;span class="p"&gt;}&lt;/span&gt;
    &lt;span class="k"&gt;return&lt;/span&gt; &lt;span class="nx"&gt;funcionario&lt;/span&gt;&lt;span class="p"&gt;.&lt;/span&gt;&lt;span class="nx"&gt;salarioBase&lt;/span&gt; &lt;span class="o"&gt;*&lt;/span&gt; &lt;span class="mf"&gt;0.9&lt;/span&gt;&lt;span class="p"&gt;;&lt;/span&gt;
  &lt;span class="p"&gt;}&lt;/span&gt;

  &lt;span class="nf"&gt;quinzeOuVinteCincoPorcento&lt;/span&gt;&lt;span class="p"&gt;(&lt;/span&gt;&lt;span class="nx"&gt;funcionario&lt;/span&gt;&lt;span class="p"&gt;)&lt;/span&gt; &lt;span class="p"&gt;{&lt;/span&gt;
    &lt;span class="k"&gt;if &lt;/span&gt;&lt;span class="p"&gt;(&lt;/span&gt;&lt;span class="nx"&gt;funcionario&lt;/span&gt;&lt;span class="p"&gt;.&lt;/span&gt;&lt;span class="nx"&gt;salarioBase&lt;/span&gt; &lt;span class="o"&gt;&amp;gt;&lt;/span&gt; &lt;span class="mi"&gt;2000&lt;/span&gt;&lt;span class="p"&gt;)&lt;/span&gt; &lt;span class="p"&gt;{&lt;/span&gt;
      &lt;span class="k"&gt;return&lt;/span&gt; &lt;span class="nx"&gt;funcionario&lt;/span&gt;&lt;span class="p"&gt;.&lt;/span&gt;&lt;span class="nx"&gt;salarioBase&lt;/span&gt; &lt;span class="o"&gt;*&lt;/span&gt; &lt;span class="mf"&gt;0.75&lt;/span&gt;&lt;span class="p"&gt;;&lt;/span&gt;
    &lt;span class="p"&gt;}&lt;/span&gt;
    &lt;span class="k"&gt;return&lt;/span&gt; &lt;span class="nx"&gt;funcionario&lt;/span&gt;&lt;span class="p"&gt;.&lt;/span&gt;&lt;span class="nx"&gt;salarioBase&lt;/span&gt; &lt;span class="o"&gt;*&lt;/span&gt; &lt;span class="mf"&gt;0.85&lt;/span&gt;&lt;span class="p"&gt;;&lt;/span&gt;
  &lt;span class="p"&gt;}&lt;/span&gt;
&lt;span class="p"&gt;}&lt;/span&gt;
&lt;/code&gt;&lt;/pre&gt;

&lt;/div&gt;



&lt;h2&gt;
  
  
  Problemas dessa classe
&lt;/h2&gt;

&lt;ul&gt;
&lt;li&gt;A classe precisa saber todos os cargos.&lt;/li&gt;
&lt;li&gt;Muitos ifs → sempre que surgir um novo cargo, a classe precisa ser alterada.&lt;/li&gt;
&lt;li&gt;As regras de cálculo não podem ser reutilizadas facilmente.&lt;/li&gt;
&lt;li&gt;A classe tem mais de uma responsabilidade (decidir o cargo + calcular o salário).&lt;/li&gt;
&lt;/ul&gt;

&lt;p&gt;Ou seja, baixa coesão e alto acoplamento.&lt;/p&gt;

&lt;p&gt;O ideal seria cada regra de cálculo estar em uma classe separada. Isso aumenta a coesão e facilita reutilização e manutenção.&lt;/p&gt;

&lt;h2&gt;
  
  
  Por que essa classe é difícil de reutilizar?
&lt;/h2&gt;

&lt;p&gt;Imagine que você queira reutilizar apenas a regra dezOuVintePorcento() em outro lugar do sistema.&lt;/p&gt;

&lt;p&gt;Você não consegue usar só o método, porque ele está dentro da classe CalculadoraDeSalario.&lt;/p&gt;

&lt;p&gt;Então você é obrigado a:&lt;/p&gt;

&lt;ul&gt;
&lt;li&gt;Instanciar a classe&lt;/li&gt;
&lt;li&gt;Criar um objeto funcionário&lt;/li&gt;
&lt;li&gt;Passar o funcionário&lt;/li&gt;
&lt;li&gt;Só então usar o método&lt;/li&gt;
&lt;/ul&gt;

&lt;p&gt;Ou seja, para reutilizar uma regra de cálculo, você precisa levar a classe inteira junto.&lt;/p&gt;

&lt;p&gt;Isso é um sinal claro de baixa coesão, porque a classe está fazendo coisas demais.&lt;/p&gt;

&lt;h2&gt;
  
  
  Exemplo de classe refatorada com alta coesão
&lt;/h2&gt;



&lt;div class="highlight js-code-highlight"&gt;
&lt;pre class="highlight javascript"&gt;&lt;code&gt;&lt;span class="kd"&gt;class&lt;/span&gt; &lt;span class="nc"&gt;Cargo&lt;/span&gt; &lt;span class="p"&gt;{&lt;/span&gt;
  &lt;span class="nf"&gt;calculaSalario&lt;/span&gt;&lt;span class="p"&gt;(&lt;/span&gt;&lt;span class="nx"&gt;salarioBase&lt;/span&gt;&lt;span class="p"&gt;)&lt;/span&gt; &lt;span class="p"&gt;{&lt;/span&gt;
    &lt;span class="k"&gt;throw&lt;/span&gt; &lt;span class="k"&gt;new&lt;/span&gt; &lt;span class="nc"&gt;Error&lt;/span&gt;&lt;span class="p"&gt;(&lt;/span&gt;&lt;span class="dl"&gt;"&lt;/span&gt;&lt;span class="s2"&gt;Método deve ser implementado pela subclasse&lt;/span&gt;&lt;span class="dl"&gt;"&lt;/span&gt;&lt;span class="p"&gt;);&lt;/span&gt;
  &lt;span class="p"&gt;}&lt;/span&gt;
&lt;span class="p"&gt;}&lt;/span&gt;

&lt;span class="kd"&gt;class&lt;/span&gt; &lt;span class="nc"&gt;Desenvolvedor&lt;/span&gt; &lt;span class="kd"&gt;extends&lt;/span&gt; &lt;span class="nc"&gt;Cargo&lt;/span&gt; &lt;span class="p"&gt;{&lt;/span&gt;
  &lt;span class="nf"&gt;calculaSalario&lt;/span&gt;&lt;span class="p"&gt;(&lt;/span&gt;&lt;span class="nx"&gt;salarioBase&lt;/span&gt;&lt;span class="p"&gt;)&lt;/span&gt; &lt;span class="p"&gt;{&lt;/span&gt;
    &lt;span class="k"&gt;return&lt;/span&gt; &lt;span class="nx"&gt;salarioBase&lt;/span&gt; &lt;span class="o"&gt;&amp;gt;&lt;/span&gt; &lt;span class="mi"&gt;3000&lt;/span&gt;
      &lt;span class="p"&gt;?&lt;/span&gt; &lt;span class="nx"&gt;salarioBase&lt;/span&gt; &lt;span class="o"&gt;*&lt;/span&gt; &lt;span class="mf"&gt;0.8&lt;/span&gt;
      &lt;span class="p"&gt;:&lt;/span&gt; &lt;span class="nx"&gt;salarioBase&lt;/span&gt; &lt;span class="o"&gt;*&lt;/span&gt; &lt;span class="mf"&gt;0.9&lt;/span&gt;&lt;span class="p"&gt;;&lt;/span&gt;
  &lt;span class="p"&gt;}&lt;/span&gt;
&lt;span class="p"&gt;}&lt;/span&gt;

&lt;span class="kd"&gt;class&lt;/span&gt; &lt;span class="nc"&gt;Dba&lt;/span&gt; &lt;span class="kd"&gt;extends&lt;/span&gt; &lt;span class="nc"&gt;Cargo&lt;/span&gt; &lt;span class="p"&gt;{&lt;/span&gt;
  &lt;span class="nf"&gt;calculaSalario&lt;/span&gt;&lt;span class="p"&gt;(&lt;/span&gt;&lt;span class="nx"&gt;salarioBase&lt;/span&gt;&lt;span class="p"&gt;)&lt;/span&gt; &lt;span class="p"&gt;{&lt;/span&gt;
    &lt;span class="k"&gt;return&lt;/span&gt; &lt;span class="nx"&gt;salarioBase&lt;/span&gt; &lt;span class="o"&gt;&amp;gt;&lt;/span&gt; &lt;span class="mi"&gt;2000&lt;/span&gt;
      &lt;span class="p"&gt;?&lt;/span&gt; &lt;span class="nx"&gt;salarioBase&lt;/span&gt; &lt;span class="o"&gt;*&lt;/span&gt; &lt;span class="mf"&gt;0.75&lt;/span&gt;
      &lt;span class="p"&gt;:&lt;/span&gt; &lt;span class="nx"&gt;salarioBase&lt;/span&gt; &lt;span class="o"&gt;*&lt;/span&gt; &lt;span class="mf"&gt;0.85&lt;/span&gt;&lt;span class="p"&gt;;&lt;/span&gt;
  &lt;span class="p"&gt;}&lt;/span&gt;
&lt;span class="p"&gt;}&lt;/span&gt;

&lt;span class="kd"&gt;class&lt;/span&gt; &lt;span class="nc"&gt;Tester&lt;/span&gt; &lt;span class="kd"&gt;extends&lt;/span&gt; &lt;span class="nc"&gt;Cargo&lt;/span&gt; &lt;span class="p"&gt;{&lt;/span&gt;
  &lt;span class="nf"&gt;calculaSalario&lt;/span&gt;&lt;span class="p"&gt;(&lt;/span&gt;&lt;span class="nx"&gt;salarioBase&lt;/span&gt;&lt;span class="p"&gt;)&lt;/span&gt; &lt;span class="p"&gt;{&lt;/span&gt;
    &lt;span class="k"&gt;return&lt;/span&gt; &lt;span class="nx"&gt;salarioBase&lt;/span&gt; &lt;span class="o"&gt;&amp;gt;&lt;/span&gt; &lt;span class="mi"&gt;2000&lt;/span&gt;
      &lt;span class="p"&gt;?&lt;/span&gt; &lt;span class="nx"&gt;salarioBase&lt;/span&gt; &lt;span class="o"&gt;*&lt;/span&gt; &lt;span class="mf"&gt;0.75&lt;/span&gt;
      &lt;span class="p"&gt;:&lt;/span&gt; &lt;span class="nx"&gt;salarioBase&lt;/span&gt; &lt;span class="o"&gt;*&lt;/span&gt; &lt;span class="mf"&gt;0.85&lt;/span&gt;&lt;span class="p"&gt;;&lt;/span&gt;
  &lt;span class="p"&gt;}&lt;/span&gt;
&lt;span class="p"&gt;}&lt;/span&gt;

&lt;span class="kd"&gt;const&lt;/span&gt; &lt;span class="nx"&gt;RegrasPorCargo&lt;/span&gt; &lt;span class="o"&gt;=&lt;/span&gt; &lt;span class="p"&gt;{&lt;/span&gt;
  &lt;span class="na"&gt;DESENVOLVEDOR&lt;/span&gt;&lt;span class="p"&gt;:&lt;/span&gt; &lt;span class="k"&gt;new&lt;/span&gt; &lt;span class="nc"&gt;Desenvolvedor&lt;/span&gt;&lt;span class="p"&gt;(),&lt;/span&gt;
  &lt;span class="na"&gt;DBA&lt;/span&gt;&lt;span class="p"&gt;:&lt;/span&gt; &lt;span class="k"&gt;new&lt;/span&gt; &lt;span class="nc"&gt;Dba&lt;/span&gt;&lt;span class="p"&gt;(),&lt;/span&gt;
  &lt;span class="na"&gt;TESTER&lt;/span&gt;&lt;span class="p"&gt;:&lt;/span&gt; &lt;span class="k"&gt;new&lt;/span&gt; &lt;span class="nc"&gt;Tester&lt;/span&gt;&lt;span class="p"&gt;()&lt;/span&gt;
&lt;span class="p"&gt;};&lt;/span&gt;

&lt;span class="kd"&gt;class&lt;/span&gt; &lt;span class="nc"&gt;CalculadoraDeSalarioRefatorada&lt;/span&gt; &lt;span class="p"&gt;{&lt;/span&gt;
  &lt;span class="nf"&gt;calcula&lt;/span&gt;&lt;span class="p"&gt;(&lt;/span&gt;&lt;span class="nx"&gt;funcionario&lt;/span&gt;&lt;span class="p"&gt;)&lt;/span&gt; &lt;span class="p"&gt;{&lt;/span&gt;
    &lt;span class="kd"&gt;const&lt;/span&gt; &lt;span class="nx"&gt;regra&lt;/span&gt; &lt;span class="o"&gt;=&lt;/span&gt; &lt;span class="nx"&gt;RegrasPorCargo&lt;/span&gt;&lt;span class="p"&gt;[&lt;/span&gt;&lt;span class="nx"&gt;funcionario&lt;/span&gt;&lt;span class="p"&gt;.&lt;/span&gt;&lt;span class="nx"&gt;cargo&lt;/span&gt;&lt;span class="p"&gt;];&lt;/span&gt;

    &lt;span class="k"&gt;if &lt;/span&gt;&lt;span class="p"&gt;(&lt;/span&gt;&lt;span class="o"&gt;!&lt;/span&gt;&lt;span class="nx"&gt;regra&lt;/span&gt;&lt;span class="p"&gt;)&lt;/span&gt; &lt;span class="p"&gt;{&lt;/span&gt;
      &lt;span class="k"&gt;throw&lt;/span&gt; &lt;span class="k"&gt;new&lt;/span&gt; &lt;span class="nc"&gt;Error&lt;/span&gt;&lt;span class="p"&gt;(&lt;/span&gt;&lt;span class="dl"&gt;"&lt;/span&gt;&lt;span class="s2"&gt;Funcionário inválido&lt;/span&gt;&lt;span class="dl"&gt;"&lt;/span&gt;&lt;span class="p"&gt;);&lt;/span&gt;
    &lt;span class="p"&gt;}&lt;/span&gt;

    &lt;span class="k"&gt;return&lt;/span&gt; &lt;span class="nx"&gt;regra&lt;/span&gt;&lt;span class="p"&gt;.&lt;/span&gt;&lt;span class="nf"&gt;calculaSalario&lt;/span&gt;&lt;span class="p"&gt;(&lt;/span&gt;&lt;span class="nx"&gt;funcionario&lt;/span&gt;&lt;span class="p"&gt;.&lt;/span&gt;&lt;span class="nx"&gt;salarioBase&lt;/span&gt;&lt;span class="p"&gt;);&lt;/span&gt;
  &lt;span class="p"&gt;}&lt;/span&gt;
&lt;span class="p"&gt;}&lt;/span&gt;

&lt;span class="kd"&gt;const&lt;/span&gt; &lt;span class="nx"&gt;funcionario2&lt;/span&gt; &lt;span class="o"&gt;=&lt;/span&gt; &lt;span class="p"&gt;{&lt;/span&gt;
  &lt;span class="na"&gt;cargo&lt;/span&gt;&lt;span class="p"&gt;:&lt;/span&gt; &lt;span class="dl"&gt;"&lt;/span&gt;&lt;span class="s2"&gt;DESENVOLVEDOR&lt;/span&gt;&lt;span class="dl"&gt;"&lt;/span&gt;&lt;span class="p"&gt;,&lt;/span&gt;
  &lt;span class="na"&gt;salarioBase&lt;/span&gt;&lt;span class="p"&gt;:&lt;/span&gt; &lt;span class="mi"&gt;3500&lt;/span&gt;
&lt;span class="p"&gt;};&lt;/span&gt;

&lt;span class="kd"&gt;const&lt;/span&gt; &lt;span class="nx"&gt;calculadora2&lt;/span&gt; &lt;span class="o"&gt;=&lt;/span&gt; &lt;span class="k"&gt;new&lt;/span&gt; &lt;span class="nc"&gt;CalculadoraDeSalarioRefatorada&lt;/span&gt;&lt;span class="p"&gt;();&lt;/span&gt;

&lt;span class="nx"&gt;console&lt;/span&gt;&lt;span class="p"&gt;.&lt;/span&gt;&lt;span class="nf"&gt;log&lt;/span&gt;&lt;span class="p"&gt;(&lt;/span&gt;&lt;span class="nx"&gt;calculadora2&lt;/span&gt;&lt;span class="p"&gt;.&lt;/span&gt;&lt;span class="nf"&gt;calcula&lt;/span&gt;&lt;span class="p"&gt;(&lt;/span&gt;&lt;span class="nx"&gt;funcionario2&lt;/span&gt;&lt;span class="p"&gt;));&lt;/span&gt;
&lt;/code&gt;&lt;/pre&gt;

&lt;/div&gt;



&lt;h2&gt;
  
  
  Primeiro passo para entender a refatoração
&lt;/h2&gt;

&lt;p&gt;Antes da refatoração, a classe CalculadoraDeSalario mudava por dois motivos:&lt;/p&gt;

&lt;ul&gt;
&lt;li&gt;Quando surgia um novo cargo&lt;/li&gt;
&lt;li&gt;Quando surgia uma nova regra de cálculo&lt;/li&gt;
&lt;/ul&gt;

&lt;p&gt;Ou seja, a classe tinha mais de um motivo para mudar, o que quebra o SRP (Single Responsibility Principle).&lt;/p&gt;

&lt;p&gt;Se observarmos os métodos de cálculo, mesmo sendo diferentes, todos têm o mesmo formato:&lt;/p&gt;

&lt;ul&gt;
&lt;li&gt;Recebem o salário&lt;/li&gt;
&lt;li&gt;Aplicam uma regra&lt;/li&gt;
&lt;li&gt;Retornam o salário calculado&lt;/li&gt;
&lt;/ul&gt;

&lt;p&gt;Ou seja, todos seguem a mesma abstração.&lt;br&gt;
Então a ideia da refatoração é criar uma classe para cada regra de cálculo, todas com o mesmo método calculaSalario().&lt;/p&gt;

&lt;ul&gt;
&lt;li&gt;O que ganhamos com isso?&lt;/li&gt;
&lt;li&gt;Cada regra fica isolada&lt;/li&gt;
&lt;li&gt;Uma mudança em uma regra não afeta as outras&lt;/li&gt;
&lt;li&gt;As classes ficam menores&lt;/li&gt;
&lt;li&gt;As classes ficam mais coesas&lt;/li&gt;
&lt;li&gt;O sistema fica mais fácil de manter&lt;/li&gt;
&lt;li&gt;Podemos adicionar novos cargos sem alterar código existente&lt;/li&gt;
&lt;/ul&gt;

&lt;p&gt;Agora cada classe tem apenas um motivo para mudar: a sua própria regra de cálculo.&lt;/p&gt;

&lt;h2&gt;
  
  
  Por que não separar em pequenos métodos?
&lt;/h2&gt;

&lt;p&gt;Se separamos um método grande em pequenos métodos não teremos reuso isolado.&lt;/p&gt;

&lt;h2&gt;
  
  
  Referência
&lt;/h2&gt;

&lt;blockquote&gt;
&lt;p&gt;Este exemplo e a ideia de refatoração foram inspirados no livro: Orientação a Objetos e SOLID para Ninjas - Projetando classes flexíveis - MAURÍCIO ANICHE&lt;/p&gt;
&lt;/blockquote&gt;

</description>
      <category>architecture</category>
      <category>beginners</category>
      <category>codequality</category>
      <category>javascript</category>
    </item>
    <item>
      <title>Um resumo sobre tipos de Parâmetros em REST</title>
      <dc:creator>Determinado 96</dc:creator>
      <pubDate>Mon, 06 Apr 2026 03:17:47 +0000</pubDate>
      <link>https://dev.to/determinado96/um-resumo-sobre-tipos-de-parametros-em-rest-1cd7</link>
      <guid>https://dev.to/determinado96/um-resumo-sobre-tipos-de-parametros-em-rest-1cd7</guid>
      <description>&lt;h2&gt;
  
  
  Tipos de parâmetros
&lt;/h2&gt;

&lt;p&gt;Em APIs REST existem 3 tipos principais de parâmetros:&lt;/p&gt;

&lt;div class="table-wrapper-paragraph"&gt;&lt;table&gt;
&lt;thead&gt;
&lt;tr&gt;
&lt;th&gt;Tipo&lt;/th&gt;
&lt;th&gt;Onde fica&lt;/th&gt;
&lt;th&gt;Para que serve&lt;/th&gt;
&lt;/tr&gt;
&lt;/thead&gt;
&lt;tbody&gt;
&lt;tr&gt;
&lt;td&gt;Path Param&lt;/td&gt;
&lt;td&gt;URL&lt;/td&gt;
&lt;td&gt;Identificar recurso&lt;/td&gt;
&lt;/tr&gt;
&lt;tr&gt;
&lt;td&gt;Query Param&lt;/td&gt;
&lt;td&gt;URL&lt;/td&gt;
&lt;td&gt;Filtrar / paginar / ordenar&lt;/td&gt;
&lt;/tr&gt;
&lt;tr&gt;
&lt;td&gt;Body&lt;/td&gt;
&lt;td&gt;Corpo da requisição&lt;/td&gt;
&lt;td&gt;Enviar dados&lt;/td&gt;
&lt;/tr&gt;
&lt;/tbody&gt;
&lt;/table&gt;&lt;/div&gt;

&lt;h2&gt;
  
  
  Path Parameter (req.params)
&lt;/h2&gt;

&lt;p&gt;Parâmetro que vai na URL e serve para identificar um recurso específico (usuário, linha na tabela com base num id).&lt;/p&gt;

&lt;p&gt;Exemplo:&lt;/p&gt;

&lt;p&gt;&lt;code&gt;GET /chamados/6&lt;br&gt;
PUT /chamados/6&lt;br&gt;
DELETE /chamados/6&lt;/code&gt;&lt;/p&gt;

&lt;p&gt;Pode ter mais que um?&lt;/p&gt;

&lt;p&gt;Sim, um por segmento da URL.&lt;/p&gt;

&lt;p&gt;&lt;code&gt;GET /usuarios/10/chamados/6&lt;/code&gt;&lt;/p&gt;

&lt;p&gt;Quando usar?&lt;/p&gt;

&lt;div class="table-wrapper-paragraph"&gt;&lt;table&gt;
&lt;thead&gt;
&lt;tr&gt;
&lt;th&gt;Situação&lt;/th&gt;
&lt;th&gt;Exemplo&lt;/th&gt;
&lt;/tr&gt;
&lt;/thead&gt;
&lt;tbody&gt;
&lt;tr&gt;
&lt;td&gt;Buscar 1 registro&lt;/td&gt;
&lt;td&gt;&lt;code&gt;/chamados/6&lt;/code&gt;&lt;/td&gt;
&lt;/tr&gt;
&lt;tr&gt;
&lt;td&gt;Atualizar&lt;/td&gt;
&lt;td&gt;&lt;code&gt;/chamados/6&lt;/code&gt;&lt;/td&gt;
&lt;/tr&gt;
&lt;tr&gt;
&lt;td&gt;Deletar&lt;/td&gt;
&lt;td&gt;&lt;code&gt;/chamados/6&lt;/code&gt;&lt;/td&gt;
&lt;/tr&gt;
&lt;tr&gt;
&lt;td&gt;Recurso relacionado&lt;/td&gt;
&lt;td&gt;&lt;code&gt;/usuarios/10/chamados/6&lt;/code&gt;&lt;/td&gt;
&lt;/tr&gt;
&lt;/tbody&gt;
&lt;/table&gt;&lt;/div&gt;

&lt;h2&gt;
  
  
  Query Parameter (req.query)
&lt;/h2&gt;

&lt;p&gt;Parâmetro que vai depois do ? na URL e serve para filtrar ou consultar dados.&lt;/p&gt;

&lt;p&gt;Exemplo:&lt;/p&gt;

&lt;p&gt;&lt;code&gt;GET /chamados?status=aberto&lt;br&gt;
GET /chamados?prioridade=alta&lt;br&gt;
GET /chamados?page=2&amp;amp;limit=10&lt;br&gt;
GET /chamados?status=aberto&amp;amp;prioridade=alta&lt;/code&gt;&lt;/p&gt;

&lt;p&gt;Quando usar?&lt;/p&gt;

&lt;div class="table-wrapper-paragraph"&gt;&lt;table&gt;
&lt;thead&gt;
&lt;tr&gt;
&lt;th&gt;Situação&lt;/th&gt;
&lt;th&gt;Exemplo&lt;/th&gt;
&lt;/tr&gt;
&lt;/thead&gt;
&lt;tbody&gt;
&lt;tr&gt;
&lt;td&gt;Filtro&lt;/td&gt;
&lt;td&gt;&lt;code&gt;?status=aberto&lt;/code&gt;&lt;/td&gt;
&lt;/tr&gt;
&lt;tr&gt;
&lt;td&gt;Paginação&lt;/td&gt;
&lt;td&gt;&lt;code&gt;?page=2&lt;/code&gt;&lt;/td&gt;
&lt;/tr&gt;
&lt;tr&gt;
&lt;td&gt;Limite&lt;/td&gt;
&lt;td&gt;&lt;code&gt;?limit=10&lt;/code&gt;&lt;/td&gt;
&lt;/tr&gt;
&lt;tr&gt;
&lt;td&gt;Ordenação&lt;/td&gt;
&lt;td&gt;&lt;code&gt;?order=prioridade&lt;/code&gt;&lt;/td&gt;
&lt;/tr&gt;
&lt;tr&gt;
&lt;td&gt;Busca&lt;/td&gt;
&lt;td&gt;&lt;code&gt;?search=mouse&lt;/code&gt;&lt;/td&gt;
&lt;/tr&gt;
&lt;/tbody&gt;
&lt;/table&gt;&lt;/div&gt;

&lt;h2&gt;
  
  
  Body Parameter (req.body)
&lt;/h2&gt;

&lt;p&gt;Dados enviados no corpo da requisição (normalmente JSON).&lt;/p&gt;

&lt;p&gt;Usado em:&lt;/p&gt;

&lt;div class="table-wrapper-paragraph"&gt;&lt;table&gt;
&lt;thead&gt;
&lt;tr&gt;
&lt;th&gt;Método&lt;/th&gt;
&lt;th&gt;Uso&lt;/th&gt;
&lt;/tr&gt;
&lt;/thead&gt;
&lt;tbody&gt;
&lt;tr&gt;
&lt;td&gt;POST&lt;/td&gt;
&lt;td&gt;Criar&lt;/td&gt;
&lt;/tr&gt;
&lt;tr&gt;
&lt;td&gt;PUT&lt;/td&gt;
&lt;td&gt;Atualizar&lt;/td&gt;
&lt;/tr&gt;
&lt;tr&gt;
&lt;td&gt;PATCH&lt;/td&gt;
&lt;td&gt;Atualizar parcial&lt;/td&gt;
&lt;/tr&gt;
&lt;/tbody&gt;
&lt;/table&gt;&lt;/div&gt;

&lt;p&gt;Body Json&lt;/p&gt;

&lt;p&gt;&lt;code&gt;{&lt;br&gt;
  "titulo": "Mouse quebrado",&lt;br&gt;
  "descricao": "Meu mouse parou de funcionar",&lt;br&gt;
  "prioridade": "ALTA"&lt;br&gt;
}&lt;/code&gt;&lt;/p&gt;

&lt;p&gt;Body também vem de FORMS&lt;/p&gt;

&lt;p&gt;Quando você envia um form HTML, os dados também vão no body, não na query.&lt;/p&gt;

</description>
      <category>api</category>
      <category>backend</category>
      <category>beginners</category>
      <category>webdev</category>
    </item>
    <item>
      <title>Um resumo sobre Fake Delay – Protegendo contra User Enumeration</title>
      <dc:creator>Determinado 96</dc:creator>
      <pubDate>Sun, 05 Apr 2026 23:12:39 +0000</pubDate>
      <link>https://dev.to/determinado96/um-resumo-sobre-fake-delay-protegendo-contra-user-enumeration-4b1f</link>
      <guid>https://dev.to/determinado96/um-resumo-sobre-fake-delay-protegendo-contra-user-enumeration-4b1f</guid>
      <description>&lt;h2&gt;
  
  
  O que é Fake Delay?
&lt;/h2&gt;

&lt;p&gt;Fake delay é um atraso intencional adicionado em respostas do sistema para evitar que atacantes descubram informações sensíveis apenas pelo tempo de resposta.&lt;/p&gt;

&lt;ul&gt;
&lt;li&gt;Problema comum: sistemas podem responder mais rápido ou mais lento dependendo do dado solicitado, permitindo que alguém deduza informações privadas (como usuários existentes, senhas ou recursos).&lt;/li&gt;
&lt;li&gt;Solução: introduzir um tempo de resposta uniforme, mesmo quando a ação falha, garantindo que nenhuma informação seja revelada pelo tempo.&lt;/li&gt;
&lt;li&gt;Analogia: é como ficar sempre no mesmo ritmo de atendimento, independentemente de o pedido estar correto ou errado, para que ninguém consiga adivinhar o que acontece “por trás do balcão”.&lt;/li&gt;
&lt;/ul&gt;

</description>
      <category>backend</category>
      <category>cybersecurity</category>
      <category>infosec</category>
      <category>security</category>
    </item>
    <item>
      <title>Um resumo dos motivos para utilizar os commits antes das operações de E/S</title>
      <dc:creator>Determinado 96</dc:creator>
      <pubDate>Sun, 05 Apr 2026 22:31:08 +0000</pubDate>
      <link>https://dev.to/determinado96/um-resumo-dos-motivos-para-utilizar-os-commits-antes-das-operacoes-de-es-21m0</link>
      <guid>https://dev.to/determinado96/um-resumo-dos-motivos-para-utilizar-os-commits-antes-das-operacoes-de-es-21m0</guid>
      <description>&lt;h2&gt;
  
  
  O que são operações de E/S?
&lt;/h2&gt;

&lt;p&gt;São todas as operações em que um computador envia ou recebe dados para algum lugar fora dele mesmo. Um exemplo comum em sistemas é o envio de e-mails, que envolve comunicação com servidores externos.&lt;/p&gt;

&lt;h2&gt;
  
  
  Por que fazer o commit antes do envio de e-mail?
&lt;/h2&gt;

&lt;p&gt;Operações de E/S podem demorar ou falhar (ex.: timeout, problemas de rede). Desta forma, manter a E/S dentro de uma transação deixa o banco aberto por mais tempo, aumentando risco de:&lt;/p&gt;

&lt;ul&gt;
&lt;li&gt;Deadlocks.&lt;/li&gt;
&lt;li&gt;Travamentos.&lt;/li&gt;
&lt;li&gt;Inconsistência de dados (ex.: o e-mail é enviado, mas o commit falha).&lt;/li&gt;
&lt;/ul&gt;

&lt;p&gt;Fazendo o commit antes da operação de E/S, garantimos que:&lt;/p&gt;

&lt;ul&gt;
&lt;li&gt;O banco de dados já está atualizado.&lt;/li&gt;
&lt;li&gt;A operação de E/S não bloqueia nem compromete a transação.&lt;/li&gt;
&lt;/ul&gt;

</description>
      <category>architecture</category>
      <category>backend</category>
      <category>database</category>
      <category>softwareengineering</category>
    </item>
    <item>
      <title>Um resumo sobre JWT Token</title>
      <dc:creator>Determinado 96</dc:creator>
      <pubDate>Sun, 05 Apr 2026 22:20:27 +0000</pubDate>
      <link>https://dev.to/determinado96/um-resumo-sobre-jwt-token-1kff</link>
      <guid>https://dev.to/determinado96/um-resumo-sobre-jwt-token-1kff</guid>
      <description>&lt;h2&gt;
  
  
  O que é JWT Token?
&lt;/h2&gt;

&lt;p&gt;JWT é um token usado para &lt;strong&gt;autenticação e autorização&lt;/strong&gt; em aplicações web. Ele permite que o usuário faça login uma vez e depois apenas envie o token nas próximas requisições.&lt;/p&gt;

&lt;p&gt;Analogia: É como se você se cadastrasse em um clube, pagasse a mensalidade e recebesse uma carteirinha; depois, basta mostrar a carteirinha para entrar sempre, sem precisar pagar ou se cadastrar novamente.&lt;/p&gt;

&lt;h2&gt;
  
  
  Estrutura do JWT
&lt;/h2&gt;

&lt;p&gt;O JWT tem três partes: HEADER.PAYLOAD.SIGNATURE&lt;/p&gt;

&lt;ol&gt;
&lt;li&gt;Header: contém o tipo do token e o algoritmo.&lt;/li&gt;
&lt;li&gt;Payload: contém os dados do usuário.&lt;/li&gt;
&lt;li&gt;Signature: assinatura para garantir que o token não foi alterado.&lt;/li&gt;
&lt;/ol&gt;

&lt;p&gt;Exemplo:&lt;br&gt;
&lt;/p&gt;

&lt;div class="highlight js-code-highlight"&gt;
&lt;pre class="highlight json"&gt;&lt;code&gt;&lt;span class="p"&gt;{&lt;/span&gt;&lt;span class="w"&gt;
  &lt;/span&gt;&lt;span class="nl"&gt;"alg"&lt;/span&gt;&lt;span class="p"&gt;:&lt;/span&gt;&lt;span class="s2"&gt;"HS256"&lt;/span&gt;&lt;span class="p"&gt;,&lt;/span&gt;&lt;span class="w"&gt;
  &lt;/span&gt;&lt;span class="nl"&gt;"typ"&lt;/span&gt;&lt;span class="p"&gt;:&lt;/span&gt;&lt;span class="s2"&gt;"JWT"&lt;/span&gt;&lt;span class="w"&gt;
&lt;/span&gt;&lt;span class="p"&gt;}&lt;/span&gt;&lt;span class="w"&gt;
&lt;/span&gt;&lt;span class="p"&gt;{&lt;/span&gt;&lt;span class="w"&gt;
  &lt;/span&gt;&lt;span class="nl"&gt;"id"&lt;/span&gt;&lt;span class="p"&gt;:&lt;/span&gt;&lt;span class="mi"&gt;18&lt;/span&gt;&lt;span class="p"&gt;,&lt;/span&gt;&lt;span class="w"&gt;
  &lt;/span&gt;&lt;span class="nl"&gt;"tipo"&lt;/span&gt;&lt;span class="p"&gt;:&lt;/span&gt;&lt;span class="s2"&gt;"USUARIO"&lt;/span&gt;&lt;span class="p"&gt;,&lt;/span&gt;&lt;span class="w"&gt;
  &lt;/span&gt;&lt;span class="nl"&gt;"iat"&lt;/span&gt;&lt;span class="p"&gt;:&lt;/span&gt;&lt;span class="mi"&gt;1775408838&lt;/span&gt;&lt;span class="p"&gt;,&lt;/span&gt;&lt;span class="w"&gt;
  &lt;/span&gt;&lt;span class="nl"&gt;"exp"&lt;/span&gt;&lt;span class="p"&gt;:&lt;/span&gt;&lt;span class="mi"&gt;1775412438&lt;/span&gt;&lt;span class="w"&gt;
&lt;/span&gt;&lt;span class="p"&gt;}&lt;/span&gt;&lt;span class="w"&gt;
&lt;/span&gt;&lt;/code&gt;&lt;/pre&gt;

&lt;/div&gt;



&lt;h2&gt;
  
  
  Como funciona o fluxo com JWT numa aplicação?
&lt;/h2&gt;

&lt;ol&gt;
&lt;li&gt;Usuário faz login.&lt;/li&gt;
&lt;li&gt;Servidor gera o token com os dados do usuário.&lt;/li&gt;
&lt;li&gt;Servidor envia o token para o cliente.&lt;/li&gt;
&lt;li&gt;Cliente envia o token nas próximas requisições.&lt;/li&gt;
&lt;li&gt;Middleware valida o token.&lt;/li&gt;
&lt;li&gt;Middleware coloca os dados necessários em req.user.&lt;/li&gt;
&lt;li&gt;A rota usa os dados necessários que estão em req.user.&lt;/li&gt;
&lt;/ol&gt;

&lt;h2&gt;
  
  
  Boas práticas com Token
&lt;/h2&gt;

&lt;ul&gt;
&lt;li&gt;Não colocar senha no token.&lt;/li&gt;
&lt;li&gt;Não colocar dados sensíveis.&lt;/li&gt;
&lt;li&gt;Sempre definir expiração (exp).&lt;/li&gt;
&lt;li&gt;Usar HTTPS.&lt;/li&gt;
&lt;li&gt;Usar Refresh Token.&lt;/li&gt;
&lt;/ul&gt;

</description>
      <category>backend</category>
      <category>beginners</category>
      <category>security</category>
      <category>webdev</category>
    </item>
  </channel>
</rss>
