1801 lines
55 KiB
HTML
1801 lines
55 KiB
HTML
<!DOCTYPE html>
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<html>
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<head>
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<meta charset="utf-8">
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<meta http-equiv="X-UA-Compatible" content="IE=edge">
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<meta name="viewport" content="width=device-width, initial-scale=1">
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<meta name="description" content="Rules which enforce generally accepted best practices.">
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<meta name="keywords" content=" Best Practices, AvoidWithStatement, ConsistentReturn, GlobalVariable, ScopeForInVariable, UseBaseWithParseInt">
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<title>Best Practices | PMD Source Code Analyzer</title>
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<link rel="stylesheet" type="text/css" href="https://maxcdn.bootstrapcdn.com/font-awesome/4.5.0/css/font-awesome.min.css">
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<link rel="stylesheet" href="css/lavish-bootstrap.css">
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<link rel="stylesheet" href="css/theme-blue.css">
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<![endif]-->
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$(document).ready(function() {
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// Initialize navgoco with default options
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$("#mysidebar").navgoco({
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openClass: 'active', // open
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</head>
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<body>
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<!-- Navigation -->
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<span class="icon-bar"></span>
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</button>
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<a class="fa fa-home fa-lg navbar-brand" href="index.html"> <span class="projectTitle"> PMD Source Code Analyzer Project</span></a>
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<li><a href="https://github.com/pmd/pmd/releases/latest" target="_blank">Download</a></li>
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<li><a href="https://github.com/pmd/pmd" target="_blank">Fork us on github</a></li>
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<li>
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<!--start search-->
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<div id="search-demo-container">
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<input type="text" id="search-input" placeholder="search...">
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<ul id="results-container"></ul>
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</div>
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<script src="js/jekyll-search.js" type="text/javascript"></script>
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<script type="text/javascript">
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SimpleJekyllSearch.init({
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searchInput: document.getElementById('search-input'),
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resultsContainer: document.getElementById('results-container'),
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dataSource: 'search.json',
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searchResultTemplate: '<li><a href="{url}" title="Best Practices">{title}</a></li>',
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noResultsText: 'No results found.',
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limit: 10,
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fuzzy: true,
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</nav>
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<!-- Page Content -->
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<div class="container-toc-wrapper">
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<div class="container">
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<div class="col-lg-12"> </div>
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<!-- Content Row -->
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<div class="row">
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<!-- Sidebar Column -->
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<div class="col-md-3" id="tg-sb-sidebar">
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<ul id="mysidebar" class="nav">
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<li class="sidebarTitle">PMD 6.50.0-SNAPSHOT</li>
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<div class="sidebarTitleDate">Release date: 30-September-2022</div>
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<li>
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<a href="#">About</a>
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<ul>
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<li><a href="index.html">Home</a></li>
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<li><a href="pmd_release_notes.html">Release notes</a></li>
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<li><a href="pmd_next_major_development.html">PMD 7.0.0 development</a></li>
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<li><a href="pmd_about_help.html">Getting help</a></li>
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</ul>
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</li>
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<li>
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<a href="#">User Documentation</a>
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<ul>
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<li><a href="pmd_userdocs_installation.html">Installation and basic CLI usage</a></li>
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<li><a href="pmd_userdocs_making_rulesets.html">Making rulesets</a></li>
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<li><a href="pmd_userdocs_configuring_rules.html">Configuring rules</a></li>
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<li><a href="pmd_userdocs_best_practices.html">Best practices</a></li>
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<li><a href="pmd_userdocs_suppressing_warnings.html">Suppressing warnings</a></li>
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<li><a href="pmd_userdocs_incremental_analysis.html">Incremental analysis</a></li>
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<li><a href="pmd_userdocs_cli_reference.html">PMD CLI reference</a></li>
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<li><a href="pmd_userdocs_report_formats.html">PMD Report formats</a></li>
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<li class="subfolders">
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<a href="#">CPD reference</a>
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<ul>
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||
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||
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<li><a href="pmd_userdocs_cpd.html">Copy-paste detection</a></li>
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||
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||
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||
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<li><a href="pmd_userdocs_cpd_report_formats.html">CPD Report formats</a></li>
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||
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</ul>
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</li>
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||
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||
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||
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||
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||
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||
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||
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||
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||
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<li class="subfolders">
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||
<a href="#">Extending PMD</a>
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||
<ul>
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||
|
||
|
||
|
||
<li><a href="pmd_userdocs_extending_writing_rules_intro.html">Introduction to writing rules</a></li>
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||
|
||
|
||
|
||
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||
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<li><a href="pmd_userdocs_extending_your_first_rule.html">Your first rule</a></li>
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||
|
||
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||
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||
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||
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||
<li><a href="pmd_userdocs_extending_writing_xpath_rules.html">XPath rules</a></li>
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||
|
||
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||
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||
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||
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||
<li><a href="pmd_userdocs_extending_writing_java_rules.html">Java rules</a></li>
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||
|
||
|
||
|
||
|
||
|
||
<li><a href="pmd_userdocs_extending_designer_reference.html">Rule designer reference</a></li>
|
||
|
||
|
||
|
||
|
||
|
||
<li><a href="pmd_userdocs_extending_defining_properties.html">Defining rule properties</a></li>
|
||
|
||
|
||
|
||
|
||
|
||
<li><a href="pmd_userdocs_extending_metrics_howto.html">Using and defining code metrics</a></li>
|
||
|
||
|
||
|
||
|
||
|
||
<li><a href="pmd_userdocs_extending_rule_guidelines.html">Rule guidelines</a></li>
|
||
|
||
|
||
|
||
|
||
|
||
<li><a href="pmd_userdocs_extending_testing.html">Testing your rules</a></li>
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||
|
||
|
||
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||
</ul>
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||
</li>
|
||
|
||
|
||
|
||
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||
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||
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||
|
||
|
||
|
||
|
||
|
||
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||
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||
<li class="subfolders">
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||
<a href="#">Tools / Integrations</a>
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||
<ul>
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||
|
||
|
||
|
||
<li><a href="pmd_userdocs_tools_maven.html">Maven PMD Plugin</a></li>
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||
|
||
|
||
|
||
|
||
|
||
<li><a href="pmd_userdocs_tools_gradle.html">Gradle</a></li>
|
||
|
||
|
||
|
||
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||
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||
<li><a href="pmd_userdocs_tools_ant.html">Ant</a></li>
|
||
|
||
|
||
|
||
|
||
|
||
<li><a href="pmd_userdocs_tools_java_api.html">PMD Java API</a></li>
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||
|
||
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||
|
||
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||
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||
<li><a href="pmd_userdocs_tools_ci.html">CI integrations</a></li>
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||
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||
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||
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||
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||
|
||
<li><a href="pmd_userdocs_tools.html">Other Tools / Integrations</a></li>
|
||
|
||
|
||
|
||
</ul>
|
||
</li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
</ul>
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||
</li>
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||
|
||
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||
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||
<li>
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||
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||
<a href="#">Rule Reference</a>
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||
|
||
<ul>
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||
|
||
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||
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||
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||
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||
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||
|
||
<li class="subfolders">
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||
<a href="#">Apex Rules</a>
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||
<ul>
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||
|
||
|
||
|
||
<li><a href="pmd_rules_apex.html">Index</a></li>
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||
|
||
|
||
|
||
|
||
|
||
<li><a href="pmd_rules_apex_bestpractices.html">Best Practices</a></li>
|
||
|
||
|
||
|
||
|
||
|
||
<li><a href="pmd_rules_apex_codestyle.html">Code Style</a></li>
|
||
|
||
|
||
|
||
|
||
|
||
<li><a href="pmd_rules_apex_design.html">Design</a></li>
|
||
|
||
|
||
|
||
|
||
|
||
<li><a href="pmd_rules_apex_documentation.html">Documentation</a></li>
|
||
|
||
|
||
|
||
|
||
|
||
<li><a href="pmd_rules_apex_errorprone.html">Error Prone</a></li>
|
||
|
||
|
||
|
||
|
||
|
||
<li><a href="pmd_rules_apex_performance.html">Performance</a></li>
|
||
|
||
|
||
|
||
|
||
|
||
<li><a href="pmd_rules_apex_security.html">Security</a></li>
|
||
|
||
|
||
|
||
</ul>
|
||
</li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li class="subfolders">
|
||
<a href="#">Ecmascript Rules</a>
|
||
<ul>
|
||
|
||
|
||
|
||
<li><a href="pmd_rules_ecmascript.html">Index</a></li>
|
||
|
||
|
||
|
||
|
||
|
||
<li class="active"><a href="pmd_rules_ecmascript_bestpractices.html">Best Practices</a></li>
|
||
|
||
|
||
|
||
|
||
|
||
<li><a href="pmd_rules_ecmascript_codestyle.html">Code Style</a></li>
|
||
|
||
|
||
|
||
|
||
|
||
<li><a href="pmd_rules_ecmascript_errorprone.html">Error Prone</a></li>
|
||
|
||
|
||
|
||
</ul>
|
||
</li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li class="subfolders">
|
||
<a href="#">HTML Rules</a>
|
||
<ul>
|
||
|
||
|
||
|
||
<li><a href="pmd_rules_html.html">Index</a></li>
|
||
|
||
|
||
|
||
|
||
|
||
<li><a href="pmd_rules_html_bestpractices.html">Best Practices</a></li>
|
||
|
||
|
||
|
||
</ul>
|
||
</li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li class="subfolders">
|
||
<a href="#">Java Rules</a>
|
||
<ul>
|
||
|
||
|
||
|
||
<li><a href="pmd_rules_java.html">Index</a></li>
|
||
|
||
|
||
|
||
|
||
|
||
<li><a href="pmd_rules_java_bestpractices.html">Best Practices</a></li>
|
||
|
||
|
||
|
||
|
||
|
||
<li><a href="pmd_rules_java_codestyle.html">Code Style</a></li>
|
||
|
||
|
||
|
||
|
||
|
||
<li><a href="pmd_rules_java_design.html">Design</a></li>
|
||
|
||
|
||
|
||
|
||
|
||
<li><a href="pmd_rules_java_documentation.html">Documentation</a></li>
|
||
|
||
|
||
|
||
|
||
|
||
<li><a href="pmd_rules_java_errorprone.html">Error Prone</a></li>
|
||
|
||
|
||
|
||
|
||
|
||
<li><a href="pmd_rules_java_multithreading.html">Multithreading</a></li>
|
||
|
||
|
||
|
||
|
||
|
||
<li><a href="pmd_rules_java_performance.html">Performance</a></li>
|
||
|
||
|
||
|
||
|
||
|
||
<li><a href="pmd_rules_java_security.html">Security</a></li>
|
||
|
||
|
||
|
||
</ul>
|
||
</li>
|
||
|
||
|
||
|
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|
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|
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|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li class="subfolders">
|
||
<a href="#">Java Server Pages Rules</a>
|
||
<ul>
|
||
|
||
|
||
|
||
<li><a href="pmd_rules_jsp.html">Index</a></li>
|
||
|
||
|
||
|
||
|
||
|
||
<li><a href="pmd_rules_jsp_bestpractices.html">Best Practices</a></li>
|
||
|
||
|
||
|
||
|
||
|
||
<li><a href="pmd_rules_jsp_codestyle.html">Code Style</a></li>
|
||
|
||
|
||
|
||
|
||
|
||
<li><a href="pmd_rules_jsp_design.html">Design</a></li>
|
||
|
||
|
||
|
||
|
||
|
||
<li><a href="pmd_rules_jsp_errorprone.html">Error Prone</a></li>
|
||
|
||
|
||
|
||
|
||
|
||
<li><a href="pmd_rules_jsp_security.html">Security</a></li>
|
||
|
||
|
||
|
||
</ul>
|
||
</li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li class="subfolders">
|
||
<a href="#">Maven POM Rules</a>
|
||
<ul>
|
||
|
||
|
||
|
||
<li><a href="pmd_rules_pom.html">Index</a></li>
|
||
|
||
|
||
|
||
|
||
|
||
<li><a href="pmd_rules_pom_errorprone.html">Error Prone</a></li>
|
||
|
||
|
||
|
||
</ul>
|
||
</li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li class="subfolders">
|
||
<a href="#">Modelica Rules</a>
|
||
<ul>
|
||
|
||
|
||
|
||
<li><a href="pmd_rules_modelica.html">Index</a></li>
|
||
|
||
|
||
|
||
|
||
|
||
<li><a href="pmd_rules_modelica_bestpractices.html">Best Practices</a></li>
|
||
|
||
|
||
|
||
</ul>
|
||
</li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li class="subfolders">
|
||
<a href="#">PLSQL Rules</a>
|
||
<ul>
|
||
|
||
|
||
|
||
<li><a href="pmd_rules_plsql.html">Index</a></li>
|
||
|
||
|
||
|
||
|
||
|
||
<li><a href="pmd_rules_plsql_bestpractices.html">Best Practices</a></li>
|
||
|
||
|
||
|
||
|
||
|
||
<li><a href="pmd_rules_plsql_codestyle.html">Code Style</a></li>
|
||
|
||
|
||
|
||
|
||
|
||
<li><a href="pmd_rules_plsql_design.html">Design</a></li>
|
||
|
||
|
||
|
||
|
||
|
||
<li><a href="pmd_rules_plsql_errorprone.html">Error Prone</a></li>
|
||
|
||
|
||
|
||
</ul>
|
||
</li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li class="subfolders">
|
||
<a href="#">Salesforce VisualForce Rules</a>
|
||
<ul>
|
||
|
||
|
||
|
||
<li><a href="pmd_rules_vf.html">Index</a></li>
|
||
|
||
|
||
|
||
|
||
|
||
<li><a href="pmd_rules_vf_security.html">Security</a></li>
|
||
|
||
|
||
|
||
</ul>
|
||
</li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li class="subfolders">
|
||
<a href="#">VM Rules</a>
|
||
<ul>
|
||
|
||
|
||
|
||
<li><a href="pmd_rules_vm.html">Index</a></li>
|
||
|
||
|
||
|
||
|
||
|
||
<li><a href="pmd_rules_vm_bestpractices.html">Best Practices</a></li>
|
||
|
||
|
||
|
||
|
||
|
||
<li><a href="pmd_rules_vm_design.html">Design</a></li>
|
||
|
||
|
||
|
||
|
||
|
||
<li><a href="pmd_rules_vm_errorprone.html">Error Prone</a></li>
|
||
|
||
|
||
|
||
</ul>
|
||
</li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li class="subfolders">
|
||
<a href="#">XML Rules</a>
|
||
<ul>
|
||
|
||
|
||
|
||
<li><a href="pmd_rules_xml.html">Index</a></li>
|
||
|
||
|
||
|
||
|
||
|
||
<li><a href="pmd_rules_xml_errorprone.html">Error Prone</a></li>
|
||
|
||
|
||
|
||
</ul>
|
||
</li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li class="subfolders">
|
||
<a href="#">XSL Rules</a>
|
||
<ul>
|
||
|
||
|
||
|
||
<li><a href="pmd_rules_xsl.html">Index</a></li>
|
||
|
||
|
||
|
||
|
||
|
||
<li><a href="pmd_rules_xsl_codestyle.html">Code Style</a></li>
|
||
|
||
|
||
|
||
|
||
|
||
<li><a href="pmd_rules_xsl_performance.html">Performance</a></li>
|
||
|
||
|
||
|
||
</ul>
|
||
</li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
</ul>
|
||
</li>
|
||
|
||
|
||
|
||
<li>
|
||
|
||
<a href="#">Language Specific Documentation</a>
|
||
|
||
<ul>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li><a href="pmd_languages_jsp.html">JSP Support</a></li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li class="subfolders">
|
||
<a href="#">Java Support</a>
|
||
<ul>
|
||
|
||
|
||
|
||
<li><a href="pmd_languages_java.html">Java Versions</a></li>
|
||
|
||
|
||
|
||
|
||
|
||
<li><a href="pmd_java_metrics_index.html">Java Code Metrics</a></li>
|
||
|
||
|
||
|
||
</ul>
|
||
</li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li><a href="pmd_apex_metrics_index.html">Apex code metrics</a></li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li><a href="pmd_languages_plsql.html">PLSQL</a></li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li><a href="pmd_languages_visualforce.html">Visualforce</a></li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li><a href="pmd_languages_xml.html">XML and XML dialects</a></li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li><a href="pmd_languages_html.html">HTML</a></li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li><a href="pmd_languages_gherkin.html">Gherkin</a></li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
</ul>
|
||
</li>
|
||
|
||
|
||
|
||
<li>
|
||
|
||
<a href="#">Developer Documentation</a>
|
||
|
||
<ul>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li><a href="pmd_devdocs_development.html">Developer resources</a></li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li><a href="pmd_devdocs_building.html">Building PMD from source</a></li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li><a href="https://github.com/pmd/pmd/blob/master/CONTRIBUTING.md" target="_blank">Contributing</a></li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li><a href="pmd_devdocs_writing_documentation.html">Writing documentation</a></li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li><a href="pmd_devdocs_roadmap.html">Roadmap</a></li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li><a href="pmd_devdocs_how_pmd_works.html">How PMD works</a></li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li><a href="pmd_devdocs_pmdtester.html">Pmdtester</a></li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li><a href="pmd_devdocs_rule_deprecation_policy.html">Rule Deprecation Policy</a></li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li class="subfolders">
|
||
<a href="#">Major contributions</a>
|
||
<ul>
|
||
|
||
|
||
|
||
<li><a href="pmd_devdocs_major_rule_guidelines.html">Rule Guidelines</a></li>
|
||
|
||
|
||
|
||
|
||
|
||
<li><a href="pmd_devdocs_major_adding_new_language.html">Adding a new language</a></li>
|
||
|
||
|
||
|
||
|
||
|
||
<li><a href="pmd_devdocs_major_adding_new_cpd_language.html">Adding a new CPD language</a></li>
|
||
|
||
|
||
|
||
|
||
|
||
<li><a href="pmd_devdocs_major_adding_new_metrics_framework.html">Adding metrics support to a language</a></li>
|
||
|
||
|
||
|
||
</ul>
|
||
</li>
|
||
|
||
|
||
|
||
<li class="subfolders">
|
||
<a href="#">Experimental features</a>
|
||
<ul>
|
||
|
||
|
||
|
||
<li><a href="pmd_devdocs_experimental_ast_dump.html">Creating (XML) dump of the AST</a></li>
|
||
|
||
|
||
|
||
</ul>
|
||
</li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
</ul>
|
||
</li>
|
||
|
||
|
||
|
||
<li>
|
||
|
||
<a href="#">Project documentation</a>
|
||
|
||
<ul>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li class="subfolders">
|
||
<a href="#">Trivia about PMD</a>
|
||
<ul>
|
||
|
||
|
||
|
||
<li><a href="pmd_projectdocs_trivia_news.html">PMD in the press</a></li>
|
||
|
||
|
||
|
||
|
||
|
||
<li><a href="pmd_projectdocs_trivia_products.html">Products & books related to PMD</a></li>
|
||
|
||
|
||
|
||
|
||
|
||
<li><a href="pmd_projectdocs_trivia_similarprojects.html">Similar projects</a></li>
|
||
|
||
|
||
|
||
|
||
|
||
<li><a href="pmd_projectdocs_trivia_meaning.html">What does 'PMD' mean?</a></li>
|
||
|
||
|
||
|
||
</ul>
|
||
</li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li><a href="pmd_projectdocs_faq.html">FAQ</a></li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li><a href="license.html">License</a></li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li><a href="pmd_projectdocs_credits.html">Credits</a></li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li><a href="pmd_release_notes_old.html">Old release notes</a></li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li class="subfolders">
|
||
<a href="#">Project management</a>
|
||
<ul>
|
||
|
||
|
||
|
||
<li><a href="pmd_projectdocs_committers_infrastructure.html">Infrastructure</a></li>
|
||
|
||
|
||
|
||
|
||
|
||
<li><a href="pmd_projectdocs_committers_releasing.html">Release process</a></li>
|
||
|
||
|
||
|
||
|
||
|
||
<li><a href="pmd_projectdocs_committers_merging_pull_requests.html">Merging pull requests</a></li>
|
||
|
||
|
||
|
||
|
||
|
||
<li><a href="pmd_projectdocs_committers_main_landing_page.html">Main Landing page</a></li>
|
||
|
||
|
||
|
||
</ul>
|
||
</li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
</ul>
|
||
</li>
|
||
|
||
|
||
|
||
<!-- if you aren't using the accordion, uncomment this block:
|
||
<p class="external">
|
||
<a href="#" id="collapseAll">Collapse All</a> | <a href="#" id="expandAll">Expand All</a>
|
||
</p>
|
||
-->
|
||
</ul>
|
||
|
||
<!-- this highlights the active parent class in the navgoco sidebar. this is critical so that the parent expands when you're viewing a page. This must appear below the sidebar code above. Otherwise, if placed inside customscripts.js, the script runs before the sidebar code runs and the class never gets inserted.-->
|
||
<script>$("li.active").parents('li').toggleClass("active");</script>
|
||
|
||
</div>
|
||
|
||
|
||
|
||
<!-- Content Column -->
|
||
<div class="col-md-9" id="tg-sb-content">
|
||
<header>
|
||
<div class="row">
|
||
<div class="col-lg-12">
|
||
<a href="./" role="button"
|
||
><i class="fa fa-home fa-lg"></i
|
||
></a>
|
||
» Best Practices
|
||
<a
|
||
target="_blank"
|
||
href="https://github.com/pmd/pmd/blob/master/docs/../pmd-javascript/src/main/resources/category/ecmascript/bestpractices.xml"
|
||
class="pull-right"
|
||
role="button"
|
||
><i class="fa fa-github fa-lg"></i> Edit on GitHub</a
|
||
>
|
||
|
||
</div>
|
||
</div>
|
||
|
||
<hr />
|
||
</header>
|
||
|
||
|
||
<div class="post-header">
|
||
<h1 class="post-title-main">Best Practices</h1>
|
||
</div>
|
||
|
||
|
||
|
||
<div class="post-content" data-github-edit-url="https://github.com/pmd/pmd/blob/master/docs/../pmd-javascript/src/main/resources/category/ecmascript/bestpractices.xml">
|
||
|
||
|
||
<div class="summary">Rules which enforce generally accepted best practices.</div>
|
||
|
||
<div id="inline-toc"><!-- empty, move TOC here when screen size too small --></div>
|
||
|
||
<!-- DO NOT EDIT THIS FILE. This file is generated from file ../pmd-javascript/src/main/resources/category/ecmascript/bestpractices.xml. -->
|
||
<h2 id="avoidwithstatement">AvoidWithStatement</h2>
|
||
|
||
<p><strong>Since:</strong> PMD 5.0.1</p>
|
||
|
||
<p><strong>Priority:</strong> High (1)</p>
|
||
|
||
<p>Avoid using with - it’s bad news</p>
|
||
|
||
<p><strong>This rule is defined by the following XPath expression:</strong></p>
|
||
<div class="language-xpath highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="o">//</span><span class="nt">WithStatement</span><span class="w">
|
||
</span></code></pre></div></div>
|
||
|
||
<p><strong>Example(s):</strong></p>
|
||
|
||
<div class="language-javascript highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="kd">with</span> <span class="p">(</span><span class="nx">object</span><span class="p">)</span> <span class="p">{</span>
|
||
<span class="nx">property</span> <span class="o">=</span> <span class="mi">3</span><span class="p">;</span> <span class="c1">// Might be on object, might be on window: who knows.</span>
|
||
<span class="p">}</span>
|
||
</code></pre></div></div>
|
||
|
||
<p><strong>Use this rule by referencing it:</strong></p>
|
||
<div class="language-xml highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="nt"><rule</span> <span class="na">ref=</span><span class="s">"category/ecmascript/bestpractices.xml/AvoidWithStatement"</span> <span class="nt">/></span>
|
||
</code></pre></div></div>
|
||
|
||
<h2 id="consistentreturn">ConsistentReturn</h2>
|
||
|
||
<p><strong>Since:</strong> PMD 5.0</p>
|
||
|
||
<p><strong>Priority:</strong> Medium High (2)</p>
|
||
|
||
<p>ECMAScript does provide for return types on functions, and therefore there is no solid rule as to their usage.
|
||
However, when a function does use returns they should all have a value, or all with no value. Mixed return
|
||
usage is likely a bug, or at best poor style.</p>
|
||
|
||
<p><strong>This rule is defined by the following Java class:</strong> <a href="https://github.com/pmd/pmd/blob/master/pmd-javascript/src/main/java/net/sourceforge/pmd/lang/ecmascript/rule/bestpractices/ConsistentReturnRule.java">net.sourceforge.pmd.lang.ecmascript.rule.bestpractices.ConsistentReturnRule</a></p>
|
||
|
||
<p><strong>Example(s):</strong></p>
|
||
|
||
<div class="language-javascript highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="c1">// Ok</span>
|
||
<span class="kd">function</span> <span class="nx">foo</span><span class="p">()</span> <span class="p">{</span>
|
||
<span class="k">if</span> <span class="p">(</span><span class="nx">condition1</span><span class="p">)</span> <span class="p">{</span>
|
||
<span class="k">return</span> <span class="kc">true</span><span class="p">;</span>
|
||
<span class="p">}</span>
|
||
<span class="k">return</span> <span class="kc">false</span><span class="p">;</span>
|
||
<span class="p">}</span>
|
||
|
||
<span class="c1">// Bad</span>
|
||
<span class="kd">function</span> <span class="nx">bar</span><span class="p">()</span> <span class="p">{</span>
|
||
<span class="k">if</span> <span class="p">(</span><span class="nx">condition1</span><span class="p">)</span> <span class="p">{</span>
|
||
<span class="k">return</span><span class="p">;</span>
|
||
<span class="p">}</span>
|
||
<span class="k">return</span> <span class="kc">false</span><span class="p">;</span>
|
||
<span class="p">}</span>
|
||
</code></pre></div></div>
|
||
|
||
<p><strong>This rule has the following properties:</strong></p>
|
||
|
||
<table>
|
||
<thead>
|
||
<tr>
|
||
<th>Name</th>
|
||
<th>Default Value</th>
|
||
<th>Description</th>
|
||
<th>Multivalued</th>
|
||
</tr>
|
||
</thead>
|
||
<tbody>
|
||
<tr>
|
||
<td>rhinoLanguageVersion</td>
|
||
<td>ES6</td>
|
||
<td>Specifies the Rhino Language Version to use for parsing. Defaults to ES6.</td>
|
||
<td>no</td>
|
||
</tr>
|
||
<tr>
|
||
<td>recordingLocalJsDocComments</td>
|
||
<td>true</td>
|
||
<td>Specifies that JsDoc comments are produced in the AST.</td>
|
||
<td>no</td>
|
||
</tr>
|
||
<tr>
|
||
<td>recordingComments</td>
|
||
<td>true</td>
|
||
<td>Specifies that comments are produced in the AST.</td>
|
||
<td>no</td>
|
||
</tr>
|
||
</tbody>
|
||
</table>
|
||
|
||
<p><strong>Use this rule with the default properties by just referencing it:</strong></p>
|
||
<div class="language-xml highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="nt"><rule</span> <span class="na">ref=</span><span class="s">"category/ecmascript/bestpractices.xml/ConsistentReturn"</span> <span class="nt">/></span>
|
||
</code></pre></div></div>
|
||
|
||
<p><strong>Use this rule and customize it:</strong></p>
|
||
<div class="language-xml highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="nt"><rule</span> <span class="na">ref=</span><span class="s">"category/ecmascript/bestpractices.xml/ConsistentReturn"</span><span class="nt">></span>
|
||
<span class="nt"><properties></span>
|
||
<span class="nt"><property</span> <span class="na">name=</span><span class="s">"rhinoLanguageVersion"</span> <span class="na">value=</span><span class="s">"ES6"</span> <span class="nt">/></span>
|
||
<span class="nt"><property</span> <span class="na">name=</span><span class="s">"recordingLocalJsDocComments"</span> <span class="na">value=</span><span class="s">"true"</span> <span class="nt">/></span>
|
||
<span class="nt"><property</span> <span class="na">name=</span><span class="s">"recordingComments"</span> <span class="na">value=</span><span class="s">"true"</span> <span class="nt">/></span>
|
||
<span class="nt"></properties></span>
|
||
<span class="nt"></rule></span>
|
||
</code></pre></div></div>
|
||
|
||
<h2 id="globalvariable">GlobalVariable</h2>
|
||
|
||
<p><strong>Since:</strong> PMD 5.0</p>
|
||
|
||
<p><strong>Priority:</strong> High (1)</p>
|
||
|
||
<p>This rule helps to avoid using accidently global variables by simply missing the "var" declaration.
|
||
Global variables can lead to side-effects that are hard to debug.</p>
|
||
|
||
<p><strong>This rule is defined by the following XPath expression:</strong></p>
|
||
<div class="language-xpath highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="o">//</span><span class="nt">Assignment</span><span class="p">[</span><span class="nt">Name</span><span class="err">/</span><span class="na">@GlobalName</span><span class="w"> </span><span class="err">=</span><span class="w"> </span><span class="nf">true</span><span class="p">()]</span><span class="w">
|
||
</span></code></pre></div></div>
|
||
|
||
<p><strong>Example(s):</strong></p>
|
||
|
||
<div class="language-javascript highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="kd">function</span><span class="p">(</span><span class="nx">arg</span><span class="p">)</span> <span class="p">{</span>
|
||
<span class="nx">notDeclaredVariable</span> <span class="o">=</span> <span class="mi">1</span><span class="p">;</span> <span class="c1">// this will create a global variable and trigger the rule</span>
|
||
|
||
<span class="kd">var</span> <span class="nx">someVar</span> <span class="o">=</span> <span class="mi">1</span><span class="p">;</span> <span class="c1">// this is a local variable, that's ok</span>
|
||
|
||
<span class="nb">window</span><span class="p">.</span><span class="nx">otherGlobal</span> <span class="o">=</span> <span class="mi">2</span><span class="p">;</span> <span class="c1">// this will not trigger the rule, although it is a global variable.</span>
|
||
<span class="p">}</span>
|
||
</code></pre></div></div>
|
||
|
||
<p><strong>Use this rule by referencing it:</strong></p>
|
||
<div class="language-xml highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="nt"><rule</span> <span class="na">ref=</span><span class="s">"category/ecmascript/bestpractices.xml/GlobalVariable"</span> <span class="nt">/></span>
|
||
</code></pre></div></div>
|
||
|
||
<h2 id="scopeforinvariable">ScopeForInVariable</h2>
|
||
|
||
<p><strong>Since:</strong> PMD 5.0</p>
|
||
|
||
<p><strong>Priority:</strong> High (1)</p>
|
||
|
||
<p>A for-in loop in which the variable name is not explicitly scoped to the enclosing scope with the ‘var’ keyword can
|
||
refer to a variable in an enclosing scope outside the nearest enclosing scope. This will overwrite the
|
||
existing value of the variable in the outer scope when the body of the for-in is evaluated. When the for-in loop
|
||
has finished, the variable will contain the last value used in the for-in, and the original value from before
|
||
the for-in loop will be gone. Since the for-in variable name is most likely intended to be a temporary name, it
|
||
is better to explicitly scope the variable name to the nearest enclosing scope with ‘var’.</p>
|
||
|
||
<p><strong>This rule is defined by the following XPath expression:</strong></p>
|
||
<div class="language-xpath highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="o">//</span><span class="nt">ForInLoop</span><span class="p">[</span><span class="ow">not</span><span class="p">(</span><span class="kn">child::</span><span class="nt">VariableDeclaration</span><span class="p">)]</span><span class="o">/</span><span class="nt">Name</span><span class="p">[</span><span class="m">1</span><span class="p">]</span><span class="w">
|
||
</span></code></pre></div></div>
|
||
|
||
<p><strong>Example(s):</strong></p>
|
||
|
||
<div class="language-javascript highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="c1">// Ok</span>
|
||
<span class="kd">function</span> <span class="nx">foo</span><span class="p">()</span> <span class="p">{</span>
|
||
<span class="kd">var</span> <span class="nx">p</span> <span class="o">=</span> <span class="dl">'</span><span class="s1">clean</span><span class="dl">'</span><span class="p">;</span>
|
||
<span class="kd">function</span><span class="p">()</span> <span class="p">{</span>
|
||
<span class="kd">var</span> <span class="nx">obj</span> <span class="o">=</span> <span class="p">{</span> <span class="na">dirty</span><span class="p">:</span> <span class="dl">'</span><span class="s1">dirty</span><span class="dl">'</span> <span class="p">};</span>
|
||
<span class="k">for</span> <span class="p">(</span><span class="kd">var</span> <span class="nx">p</span> <span class="k">in</span> <span class="nx">obj</span><span class="p">)</span> <span class="p">{</span> <span class="c1">// Use 'var' here.</span>
|
||
<span class="nx">obj</span><span class="p">[</span><span class="nx">p</span><span class="p">]</span> <span class="o">=</span> <span class="nx">obj</span><span class="p">[</span><span class="nx">p</span><span class="p">];</span>
|
||
<span class="p">}</span>
|
||
<span class="k">return</span> <span class="nx">x</span><span class="p">;</span>
|
||
<span class="p">}();</span>
|
||
|
||
<span class="c1">// 'p' still has value of 'clean'.</span>
|
||
<span class="p">}</span>
|
||
<span class="c1">// Bad</span>
|
||
<span class="kd">function</span> <span class="nx">bar</span><span class="p">()</span> <span class="p">{</span>
|
||
<span class="kd">var</span> <span class="nx">p</span> <span class="o">=</span> <span class="dl">'</span><span class="s1">clean</span><span class="dl">'</span><span class="p">;</span>
|
||
<span class="kd">function</span><span class="p">()</span> <span class="p">{</span>
|
||
<span class="kd">var</span> <span class="nx">obj</span> <span class="o">=</span> <span class="p">{</span> <span class="na">dirty</span><span class="p">:</span> <span class="dl">'</span><span class="s1">dirty</span><span class="dl">'</span> <span class="p">};</span>
|
||
<span class="k">for</span> <span class="p">(</span><span class="nx">p</span> <span class="k">in</span> <span class="nx">obj</span><span class="p">)</span> <span class="p">{</span> <span class="c1">// Oh no, missing 'var' here!</span>
|
||
<span class="nx">obj</span><span class="p">[</span><span class="nx">p</span><span class="p">]</span> <span class="o">=</span> <span class="nx">obj</span><span class="p">[</span><span class="nx">p</span><span class="p">];</span>
|
||
<span class="p">}</span>
|
||
<span class="k">return</span> <span class="nx">x</span><span class="p">;</span>
|
||
<span class="p">}();</span>
|
||
|
||
<span class="c1">// 'p' is trashed and has value of 'dirty'!</span>
|
||
<span class="p">}</span>
|
||
</code></pre></div></div>
|
||
|
||
<p><strong>Use this rule by referencing it:</strong></p>
|
||
<div class="language-xml highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="nt"><rule</span> <span class="na">ref=</span><span class="s">"category/ecmascript/bestpractices.xml/ScopeForInVariable"</span> <span class="nt">/></span>
|
||
</code></pre></div></div>
|
||
|
||
<h2 id="usebasewithparseint">UseBaseWithParseInt</h2>
|
||
|
||
<p><strong>Since:</strong> PMD 5.0.1</p>
|
||
|
||
<p><strong>Priority:</strong> High (1)</p>
|
||
|
||
<p>This rule checks for usages of parseInt. While the second parameter is optional and usually defaults
|
||
to 10 (base/radix is 10 for a decimal number), different implementations may behave differently.
|
||
It also improves readability, if the base is given.</p>
|
||
|
||
<p>See also: <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/parseInt">parseInt()</a></p>
|
||
|
||
<p><strong>This rule is defined by the following XPath expression:</strong></p>
|
||
<div class="language-xpath highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="o">//</span><span class="nt">FunctionCall</span><span class="o">/</span><span class="nt">Name</span><span class="p">[</span><span class="w">
|
||
</span><span class="na">@Image</span><span class="w"> </span><span class="err">=</span><span class="w"> </span><span class="s1">'parseInt'</span><span class="w">
|
||
</span><span class="ow">and</span><span class="w">
|
||
</span><span class="nf">count</span><span class="p">(..</span><span class="err">/*</span><span class="p">)</span><span class="w"> </span><span class="o"><</span><span class="w"> </span><span class="m">3</span><span class="w">
|
||
</span><span class="p">]</span><span class="w">
|
||
</span></code></pre></div></div>
|
||
|
||
<p><strong>Example(s):</strong></p>
|
||
|
||
<div class="language-javascript highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="nb">parseInt</span><span class="p">(</span><span class="dl">"</span><span class="s2">010</span><span class="dl">"</span><span class="p">);</span> <span class="c1">// unclear, could be interpreted as 10 or 7 (with a base of 7)</span>
|
||
|
||
<span class="nb">parseInt</span><span class="p">(</span><span class="dl">"</span><span class="s2">10</span><span class="dl">"</span><span class="p">,</span> <span class="mi">10</span><span class="p">);</span> <span class="c1">// good</span>
|
||
</code></pre></div></div>
|
||
|
||
<p><strong>Use this rule by referencing it:</strong></p>
|
||
<div class="language-xml highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="nt"><rule</span> <span class="na">ref=</span><span class="s">"category/ecmascript/bestpractices.xml/UseBaseWithParseInt"</span> <span class="nt">/></span>
|
||
</code></pre></div></div>
|
||
|
||
|
||
|
||
<div class="tags">
|
||
|
||
</div>
|
||
|
||
|
||
|
||
</div>
|
||
|
||
|
||
<footer>
|
||
|
||
<hr />
|
||
<div>
|
||
This documentation is written in markdown. <br />
|
||
If there is something missing or can be improved, edit this page on
|
||
github and create a PR:
|
||
<a
|
||
target="_blank"
|
||
href="https://github.com/pmd/pmd/blob/master/docs/../pmd-javascript/src/main/resources/category/ecmascript/bestpractices.xml"
|
||
role="button"
|
||
><i class="fa fa-github fa-lg"></i> Edit on GitHub</a
|
||
>
|
||
</div>
|
||
|
||
<hr />
|
||
<div class="row">
|
||
<div class="col-lg-12 footer">
|
||
©2022 PMD Open Source Project. All rights
|
||
reserved. <br />
|
||
Site last generated: Sep 11, 2022 <br />
|
||
<p>
|
||
<img src="images/pmd-logo-small.png" alt="Company
|
||
logo"/>
|
||
</p>
|
||
</div>
|
||
</div>
|
||
</footer>
|
||
|
||
|
||
</div>
|
||
|
||
<!-- /.row -->
|
||
</div>
|
||
<!-- /.container -->
|
||
</div>
|
||
|
||
|
||
<!-- Sticky TOC column -->
|
||
<div class="toc-col">
|
||
<div id="toc"></div>
|
||
</div>
|
||
|
||
<!-- /.toc-container-wrapper -->
|
||
</div>
|
||
</div>
|
||
</body>
|
||
|
||
</html>
|