<h3>Switch statements: hide them</h3> <p>Use polymorphism or a factory. A <code>switch</code> with multiple cases usually violates the Single Responsibility Principle.</p>
<h2>7. Boundaries: Keep Third-Party Code at Arm’s Length</h2> <p>Wrap external APIs (libraries, frameworks) to isolate changes. Do not let a specific JSON library leak into your core domain.</p>
<h2>3. Comments: Don’t Compensate for Bad Code</h2> <p>The proper use of comments is to explain <em>why</em>, not <em>what</em>. Clear code needs few comments.</p> codigo limpo epub
<h2>2. Functions: The First Line of Organization</h2> <p>Functions should do one thing, do it well, and do it only.</p>
<div class="bad"> <code>// increment i by 1<br />i++;</code> </div> <div class="good"> <code>// Retry up to 3 times due to eventual consistency in payment service<br />for (int attempt = 0; attempt < 3; attempt++) { ... }</code> </div>
<h2>4. Formatting: Vertical Density and Horizontal Flow</h2> <p>Code formatting is communication. Use consistent rules.</p> Do not let a specific JSON library leak
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<h2>Introduction</h2> <p>Clean code is not a luxury—it's a necessity. Code is read far more often than it is written. This guide distills the core ideas from Robert C. Martin’s <em>Clean Code</em> and decades of collective experience into actionable rules. You will learn how to name variables, write functions, handle errors, and structure classes so that your code tells a story, not a puzzle.</p>
<ul> <li><strong>Rigidity</strong>: A small change breaks many parts → increase cohesion, reduce coupling.</li> <li><strong>Fragility</strong>: Changes cause unexpected failures → add tests, encapsulation.</li> <li><strong>Opacity</strong>: Code is hard to understand → rename, refactor, add explanatory variables.</li> <li><strong>Feature envy</strong>: A method seems more interested in another class’s data → move the method.</li> <li><strong>Long parameter list</strong>: Wrap parameters into an object (DTO).</li> </ul> One indentation level = 4 spaces.<
<ul> <li><strong>Vertical density</strong>: Related concepts should be close. Local variables at the top of a function, helper functions directly below the calling function.</li> <li><strong>Horizontal spacing</strong>: Use spaces around operators (<code>a + b</code>), not tabs or chaotic mixtures. One indentation level = 4 spaces.</li> <li><strong>Team rules</strong>: If you work in a team, agree on an automatic formatter (Prettier, Black, gofmt).</li> </ul>
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