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padding-bottom--lg"><div class="row"><div class="col docItemCol_VOVn"><div class="docItemContainer_Djhp"><article><nav class="theme-doc-breadcrumbs breadcrumbsContainer_Z_bl" aria-label="Breadcrumbs"><ul class="breadcrumbs" itemscope="" itemtype="https://schema.org/BreadcrumbList"><li class="breadcrumbs__item"><a aria-label="Home page" class="breadcrumbs__link" href="/"><svg viewBox="0 0 24 24" class="breadcrumbHomeIcon_YNFT"><path d="M10 19v-5h4v5c0 .55.45 1 1 1h3c.55 0 1-.45 1-1v-7h1.7c.46 0 .68-.57.33-.87L12.67 3.6c-.38-.34-.96-.34-1.34 0l-8.36 7.53c-.34.3-.13.87.33.87H5v7c0 .55.45 1 1 1h3c.55 0 1-.45 1-1z" fill="currentColor"></path></svg></a></li><li class="breadcrumbs__item">Rules Documentation<meta itemprop="position" content="1"></li><li itemscope="" itemprop="itemListElement" itemtype="https://schema.org/ListItem" class="breadcrumbs__item breadcrumbs__item--active">Complexity Rule Set<meta itemprop="position" content="2"></li></ul></nav>Version: 1.23.8<div class="tocCollapsible_ETCw theme-doc-toc-mobile tocMobile_ITEo"><button type="button" class="clean-btn tocCollapsibleButton_TO0P">On this page</button></div><div class="theme-doc-markdown markdown"><header><h1>Complexity Rule Set</h1></header>This rule set contains rules that report complex code. <h3 class="anchor anchorWithStickyNavbar_LWe7" id="cognitivecomplexmethod">CognitiveComplexMethod<a href="#cognitivecomplexmethod" class="hash-link" aria-label="Direct link to CognitiveComplexMethod" title="Direct link to CognitiveComplexMethod"></a></h3> Complex methods are hard to understand and read. It might not be obvious what side-effects a complex method has. Prefer splitting up complex methods into smaller methods that are in turn easier to understand. Smaller methods can also be named much clearer which leads to improved readability of the code. This rule measures and restricts the complexity of the method through the <a href="https://www.sonarsource.com/docs/CognitiveComplexity.pdf" target="_blank" rel="noopener noreferrer">Cognitive Complexity metric of Sonasource</a>. Which improves McCabe's Cyclomatic Complexity (see <a href="/docs/rules/complexity#cyclomaticcomplexmethod">CyclomaticComplexMethod</a>) considering the programmer's mental model. Similar to cyclomatic complexity, it is a mathematical model that increases +1 complexity for flow control statements, but increases additional complexity when the statements are deeply nested. The statements that increase the complexity or the nesting level are as follows. <ul> <li>Complexity Increments - <code>if</code>, <code>when</code>, <code>for</code>, <code>while</code>, <code>do while</code>, <code>catch</code>, <code>labeled break</code>, <code>labeled continue</code>, <code>labeled return</code>, <code>recursion call</code>, <code>&&</code>, <code>||</code></li> <li>Nesting Level Increments - <code>if</code>, <code>when</code>, <code>for</code>, <code>while</code>, <code>do while</code>, <code>catch</code>, <code>nested function</code></li> <li>Additional Complexity Increments by Nesting Level - <code>if</code>, <code>when</code>, <code>for</code>, <code>while</code>, <code>do while</code>, <code>catch</code></li> </ul> Active by default: No Debt: 20min <h4 class="anchor anchorWithStickyNavbar_LWe7" id="configuration-options">Configuration options:<a href="#configuration-options" class="hash-link" aria-label="Direct link to Configuration options:" title="Direct link to Configuration options:"></a></h4> <ul> <li> <code>threshold</code> (default: <code>15</code>) Cognitive Complexity number for a method. </li> </ul> <h3 class="anchor anchorWithStickyNavbar_LWe7" id="complexcondition">ComplexCondition<a href="#complexcondition" class="hash-link" aria-label="Direct link to ComplexCondition" title="Direct link to ComplexCondition"></a></h3> Complex conditions make it hard to understand which cases lead to the condition being true or false. To improve readability and understanding of complex conditions consider extracting them into well-named functions or variables and call those instead. Active by default: Yes - Since v1.0.0 Debt: 20min <h4 class="anchor anchorWithStickyNavbar_LWe7" id="configuration-options-1">Configuration options:<a href="#configuration-options-1" class="hash-link" aria-label="Direct link to Configuration options:" title="Direct link to Configuration options:"></a></h4> <ul> <li> <code>threshold</code> (default: <code>4</code>) the number of conditions which will trigger the rule </li> </ul> <h4 class="anchor anchorWithStickyNavbar_LWe7" id="noncompliant-code">Noncompliant Code:<a href="#noncompliant-code" class="hash-link" aria-label="Direct link to Noncompliant Code:" title="Direct link to Noncompliant Code:"></a></h4> <div class="language-kotlin codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#393A34;--prism-background-color:#f6f8fa"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-kotlin codeBlock_bY9V thin-scrollbar" style="color:#393A34;background-color:#f6f8fa"><code class="codeBlockLines_e6Vv">val str = "foo" val isFoo = if (str.startsWith("foo") && !str.endsWith("foo") && !str.endsWith("bar") && !str.endsWith("_")) { // ... } </code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><svg viewBox="0 0 24 24" class="copyButtonIcon_y97N"><path fill="currentColor" d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg viewBox="0 0 24 24" class="copyButtonSuccessIcon_LjdS"><path fill="currentColor" d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></button></div></div></div> <h4 class="anchor anchorWithStickyNavbar_LWe7" id="compliant-code">Compliant Code:<a href="#compliant-code" class="hash-link" aria-label="Direct link to Compliant Code:" title="Direct link to Compliant Code:"></a></h4> <div class="language-kotlin codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#393A34;--prism-background-color:#f6f8fa"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-kotlin codeBlock_bY9V thin-scrollbar" style="color:#393A34;background-color:#f6f8fa"><code class="codeBlockLines_e6Vv">val str = "foo" val isFoo = if (str.startsWith("foo") && hasCorrectEnding()) { // ... } fun hasCorrectEnding() = return !str.endsWith("foo") && !str.endsWith("bar") && !str.endsWith("_") </code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><svg viewBox="0 0 24 24" class="copyButtonIcon_y97N"><path fill="currentColor" d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg viewBox="0 0 24 24" class="copyButtonSuccessIcon_LjdS"><path fill="currentColor" d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></button></div></div></div> <h3 class="anchor anchorWithStickyNavbar_LWe7" id="complexinterface">ComplexInterface<a href="#complexinterface" class="hash-link" aria-label="Direct link to ComplexInterface" title="Direct link to ComplexInterface"></a></h3> Complex interfaces which contain too many functions and/or properties indicate that this interface is handling too many things at once. Interfaces should follow the single-responsibility principle to also encourage implementations of this interface to not handle too many things at once. Large interfaces should be split into smaller interfaces which have a clear responsibility and are easier to understand and implement. Active by default: No Debt: 20min <h4 class="anchor anchorWithStickyNavbar_LWe7" id="configuration-options-2">Configuration options:<a href="#configuration-options-2" class="hash-link" aria-label="Direct link to Configuration options:" title="Direct link to Configuration options:"></a></h4> <ul> <li> <code>threshold</code> (default: <code>10</code>) the amount of definitions in an interface to trigger the rule </li> <li> <code>includeStaticDeclarations</code> (default: <code>false</code>) whether static declarations should be included </li> <li> <code>includePrivateDeclarations</code> (default: <code>false</code>) whether private declarations should be included </li> <li> <code>ignoreOverloaded</code> (default: <code>false</code>) ignore overloaded methods - only count once </li> </ul> <h3 class="anchor anchorWithStickyNavbar_LWe7" id="cyclomaticcomplexmethod">CyclomaticComplexMethod<a href="#cyclomaticcomplexmethod" class="hash-link" aria-label="Direct link to CyclomaticComplexMethod" title="Direct link to CyclomaticComplexMethod"></a></h3> Complex methods are hard to understand and read. It might not be obvious what side-effects a complex method has. Prefer splitting up complex methods into smaller methods that are in turn easier to understand. Smaller methods can also be named much clearer which leads to improved readability of the code. This rule uses McCabe's Cyclomatic Complexity (MCC) metric to measure the number of linearly independent paths through a function's source code (<a href="https://www.ndepend.com/docs/code-metrics#CC" target="_blank" rel="noopener noreferrer">https://www.ndepend.com/docs/code-metrics#CC</a>). The higher the number of independent paths, the more complex a method is. Complex methods use too many of the following statements. Each one of them adds one to the complexity count. <ul> <li>Conditional statements - <code>if</code>, <code>else if</code>, <code>when</code></li> <li>Jump statements - <code>continue</code>, <code>break</code></li> <li>Loops - <code>for</code>, <code>while</code>, <code>do-while</code>, <code>forEach</code></li> <li>Operators <code>&&</code>, <code>||</code>, <code>?:</code></li> <li>Exceptions - <code>catch</code>, <code>use</code></li> <li>Scope Functions - <code>let</code>, <code>run</code>, <code>with</code>, <code>apply</code>, and <code>also</code> -> <a href="https://kotlinlang.org/docs/scope-functions.html" target="_blank" rel="noopener noreferrer">Reference</a></li> </ul> Active by default: Yes - Since v1.0.0 Debt: 20min Aliases: ComplexMethod <h4 class="anchor anchorWithStickyNavbar_LWe7" id="configuration-options-3">Configuration options:<a href="#configuration-options-3" class="hash-link" aria-label="Direct link to Configuration options:" title="Direct link to Configuration options:"></a></h4> <ul> <li> <code>threshold</code> (default: <code>15</code>) McCabe's Cyclomatic Complexity (MCC) number for a method. </li> <li> <code>ignoreSingleWhenExpression</code> (default: <code>false</code>) Ignores a complex method if it only contains a single when expression. </li> <li> <code>ignoreSimpleWhenEntries</code> (default: <code>false</code>) Whether to ignore simple (braceless) when entries. </li> <li> <code>ignoreNestingFunctions</code> (default: <code>false</code>) Whether to ignore functions which are often used instead of an <code>if</code> or <code>for</code> statement. </li> <li> <code>nestingFunctions</code> (default: <code>['also', 'apply', 'forEach', 'isNotNull', 'ifNull', 'let', 'run', 'use', 'with']</code>) Comma separated list of function names which add complexity. </li> </ul> <h3 class="anchor anchorWithStickyNavbar_LWe7" id="labeledexpression">LabeledExpression<a href="#labeledexpression" class="hash-link" aria-label="Direct link to LabeledExpression" title="Direct link to LabeledExpression"></a></h3> This rule reports labeled expressions. Expressions with labels generally increase complexity and worsen the maintainability of the code. Refactor the violating code to not use labels instead. Labeled expressions referencing an outer class with a label from an inner class are allowed, because there is no way to get the instance of an outer class from an inner class in Kotlin. Active by default: No Debt: 20min <h4 class="anchor anchorWithStickyNavbar_LWe7" id="configuration-options-4">Configuration options:<a href="#configuration-options-4" class="hash-link" aria-label="Direct link to Configuration options:" title="Direct link to Configuration options:"></a></h4> <ul> <li> <code>ignoredLabels</code> (default: <code>[]</code>) allows to provide a list of label names which should be ignored by this rule </li> </ul> <h4 class="anchor anchorWithStickyNavbar_LWe7" id="noncompliant-code-1">Noncompliant Code:<a href="#noncompliant-code-1" class="hash-link" aria-label="Direct link to Noncompliant Code:" title="Direct link to Noncompliant Code:"></a></h4> <div class="language-kotlin codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#393A34;--prism-background-color:#f6f8fa"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-kotlin codeBlock_bY9V thin-scrollbar" style="color:#393A34;background-color:#f6f8fa"><code class="codeBlockLines_e6Vv">val range = listOf<String>("foo", "bar") loop@ for (r in range) { if (r == "bar") break@loop println(r) } class Outer { inner class Inner { fun f() { val i = this@Inner // referencing itself, use `this instead } } } </code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><svg viewBox="0 0 24 24" class="copyButtonIcon_y97N"><path fill="currentColor" d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg viewBox="0 0 24 24" class="copyButtonSuccessIcon_LjdS"><path fill="currentColor" d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></button></div></div></div> <h4 class="anchor anchorWithStickyNavbar_LWe7" id="compliant-code-1">Compliant Code:<a href="#compliant-code-1" class="hash-link" aria-label="Direct link to Compliant Code:" title="Direct link to Compliant Code:"></a></h4> <div class="language-kotlin codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#393A34;--prism-background-color:#f6f8fa"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-kotlin codeBlock_bY9V thin-scrollbar" style="color:#393A34;background-color:#f6f8fa"><code class="codeBlockLines_e6Vv">val range = listOf<String>("foo", "bar") for (r in range) { if (r == "bar") break println(r) } class Outer { inner class Inner { fun f() { val outer = this@Outer } fun Int.extend() { val inner = this@Inner // this would reference Int and not Inner } } } </code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><svg viewBox="0 0 24 24" class="copyButtonIcon_y97N"><path fill="currentColor" d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg viewBox="0 0 24 24" class="copyButtonSuccessIcon_LjdS"><path fill="currentColor" d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></button></div></div></div> <h3 class="anchor anchorWithStickyNavbar_LWe7" id="largeclass">LargeClass<a href="#largeclass" class="hash-link" aria-label="Direct link to LargeClass" title="Direct link to LargeClass"></a></h3> This rule reports large classes. Classes should generally have one responsibility. Large classes can indicate that the class does instead handle multiple responsibilities. Instead of doing many things at once prefer to split up large classes into smaller classes. These smaller classes are then easier to understand and handle less things. Active by default: Yes - Since v1.0.0 Debt: 20min <h4 class="anchor anchorWithStickyNavbar_LWe7" id="configuration-options-5">Configuration options:<a href="#configuration-options-5" class="hash-link" aria-label="Direct link to Configuration options:" title="Direct link to Configuration options:"></a></h4> <ul> <li> <code>threshold</code> (default: <code>600</code>) the size of class required to trigger the rule </li> </ul> <h3 class="anchor anchorWithStickyNavbar_LWe7" id="longmethod">LongMethod<a href="#longmethod" class="hash-link" aria-label="Direct link to LongMethod" title="Direct link to LongMethod"></a></h3> Methods should have one responsibility. Long methods can indicate that a method handles too many cases at once. Prefer smaller methods with clear names that describe their functionality clearly. Extract parts of the functionality of long methods into separate, smaller methods. Active by default: Yes - Since v1.0.0 Debt: 20min <h4 class="anchor anchorWithStickyNavbar_LWe7" id="configuration-options-6">Configuration options:<a href="#configuration-options-6" class="hash-link" aria-label="Direct link to Configuration options:" title="Direct link to Configuration options:"></a></h4> <ul> <li> <code>threshold</code> (default: <code>60</code>) number of lines in a method to trigger the rule </li> </ul> <h3 class="anchor anchorWithStickyNavbar_LWe7" id="longparameterlist">LongParameterList<a href="#longparameterlist" class="hash-link" aria-label="Direct link to LongParameterList" title="Direct link to LongParameterList"></a></h3> Reports functions and constructors which have more parameters than a certain threshold. Active by default: Yes - Since v1.0.0 Debt: 20min <h4 class="anchor anchorWithStickyNavbar_LWe7" id="configuration-options-7">Configuration options:<a href="#configuration-options-7" class="hash-link" aria-label="Direct link to Configuration options:" title="Direct link to Configuration options:"></a></h4> <ul> <li> <del><code>threshold</code></del> (default: <code>6</code>) Deprecated: Use <code>functionThreshold</code> and <code>constructorThreshold</code> instead number of parameters required to trigger the rule </li> <li> <code>functionThreshold</code> (default: <code>6</code>) number of function parameters required to trigger the rule </li> <li> <code>constructorThreshold</code> (default: <code>7</code>) number of constructor parameters required to trigger the rule </li> <li> <code>ignoreDefaultParameters</code> (default: <code>false</code>) ignore parameters that have a default value </li> <li> <code>ignoreDataClasses</code> (default: <code>true</code>) ignore long constructor parameters list for data classes </li> <li> <code>ignoreAnnotatedParameter</code> (default: <code>[]</code>) ignore the annotated parameters for the count (e.g. <code>fun foo(@Value bar: Int)</code> would not be counted </li> </ul> <h3 class="anchor anchorWithStickyNavbar_LWe7" id="methodoverloading">MethodOverloading<a href="#methodoverloading" class="hash-link" aria-label="Direct link to MethodOverloading" title="Direct link to MethodOverloading"></a></h3> This rule reports methods which are overloaded often. Method overloading tightly couples these methods together which might make the code harder to understand. Refactor these methods and try to use optional parameters instead to prevent some of the overloading. Active by default: No Debt: 20min <h4 class="anchor anchorWithStickyNavbar_LWe7" id="configuration-options-8">Configuration options:<a href="#configuration-options-8" class="hash-link" aria-label="Direct link to Configuration options:" title="Direct link to Configuration options:"></a></h4> <ul> <li> <code>threshold</code> (default: <code>6</code>) number of overloads which will trigger the rule </li> </ul> <h3 class="anchor anchorWithStickyNavbar_LWe7" id="namedarguments">NamedArguments<a href="#namedarguments" class="hash-link" aria-label="Direct link to NamedArguments" title="Direct link to NamedArguments"></a></h3> Reports function invocations which have more arguments than a certain threshold and are all not named. Calls with too many arguments are more difficult to understand so a named arguments help. Active by default: No Requires Type Resolution Debt: 5min <h4 class="anchor anchorWithStickyNavbar_LWe7" id="configuration-options-9">Configuration options:<a href="#configuration-options-9" class="hash-link" aria-label="Direct link to Configuration options:" title="Direct link to Configuration options:"></a></h4> <ul> <li> <code>threshold</code> (default: <code>3</code>) number of arguments that triggers this inspection </li> <li> <code>ignoreArgumentsMatchingNames</code> (default: <code>false</code>) ignores when argument values are the same as the parameter names </li> </ul> <h4 class="anchor anchorWithStickyNavbar_LWe7" id="noncompliant-code-2">Noncompliant Code:<a href="#noncompliant-code-2" class="hash-link" aria-label="Direct link to Noncompliant Code:" title="Direct link to Noncompliant Code:"></a></h4> <div class="language-kotlin codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#393A34;--prism-background-color:#f6f8fa"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-kotlin codeBlock_bY9V thin-scrollbar" style="color:#393A34;background-color:#f6f8fa"><code class="codeBlockLines_e6Vv">fun sum(a: Int, b: Int, c: Int, d: Int) { } sum(1, 2, 3, 4) </code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><svg viewBox="0 0 24 24" class="copyButtonIcon_y97N"><path fill="currentColor" d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg viewBox="0 0 24 24" class="copyButtonSuccessIcon_LjdS"><path fill="currentColor" d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></button></div></div></div> <h4 class="anchor anchorWithStickyNavbar_LWe7" id="compliant-code-2">Compliant Code:<a href="#compliant-code-2" class="hash-link" aria-label="Direct link to Compliant Code:" title="Direct link to Compliant Code:"></a></h4> <div class="language-kotlin codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#393A34;--prism-background-color:#f6f8fa"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-kotlin codeBlock_bY9V thin-scrollbar" style="color:#393A34;background-color:#f6f8fa"><code class="codeBlockLines_e6Vv">fun sum(a: Int, b: Int, c: Int, d: Int) { } sum(a = 1, b = 2, c = 3, d = 4) </code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><svg viewBox="0 0 24 24" class="copyButtonIcon_y97N"><path fill="currentColor" d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg viewBox="0 0 24 24" class="copyButtonSuccessIcon_LjdS"><path fill="currentColor" d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></button></div></div></div> <h3 class="anchor anchorWithStickyNavbar_LWe7" id="nestedblockdepth">NestedBlockDepth<a href="#nestedblockdepth" class="hash-link" aria-label="Direct link to NestedBlockDepth" title="Direct link to NestedBlockDepth"></a></h3> This rule reports excessive nesting depth in functions. Excessively nested code becomes harder to read and increases its hidden complexity. It might become harder to understand edge-cases of the function. Prefer extracting the nested code into well-named functions to make it easier to understand. Active by default: Yes - Since v1.0.0 Debt: 20min <h4 class="anchor anchorWithStickyNavbar_LWe7" id="configuration-options-10">Configuration options:<a href="#configuration-options-10" class="hash-link" aria-label="Direct link to Configuration options:" title="Direct link to Configuration options:"></a></h4> <ul> <li> <code>threshold</code> (default: <code>4</code>) the nested depth required to trigger rule </li> </ul> <h3 class="anchor anchorWithStickyNavbar_LWe7" id="nestedscopefunctions">NestedScopeFunctions<a href="#nestedscopefunctions" class="hash-link" aria-label="Direct link to NestedScopeFunctions" title="Direct link to NestedScopeFunctions"></a></h3> Although the scope functions are a way of making the code more concise, avoid overusing them: it can decrease your code readability and lead to errors. Avoid nesting scope functions and be careful when chaining them: it's easy to get confused about the current context object and the value of this or it. <a href="https://kotlinlang.org/docs/scope-functions.html" target="_blank" rel="noopener noreferrer">Reference</a> Active by default: No Requires Type Resolution Debt: 5min <h4 class="anchor anchorWithStickyNavbar_LWe7" id="configuration-options-11">Configuration options:<a href="#configuration-options-11" class="hash-link" aria-label="Direct link to Configuration options:" title="Direct link to Configuration options:"></a></h4> <ul> <li> <code>threshold</code> (default: <code>1</code>) Number of nested scope functions allowed. </li> <li> <code>functions</code> (default: <code>['kotlin.apply', 'kotlin.run', 'kotlin.with', 'kotlin.let', 'kotlin.also']</code>) Set of scope function names which add complexity. Function names have to be fully qualified. For example 'kotlin.apply'. </li> </ul> <h4 class="anchor anchorWithStickyNavbar_LWe7" id="noncompliant-code-3">Noncompliant Code:<a href="#noncompliant-code-3" class="hash-link" aria-label="Direct link to Noncompliant Code:" title="Direct link to Noncompliant Code:"></a></h4> <div class="language-kotlin codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#393A34;--prism-background-color:#f6f8fa"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-kotlin codeBlock_bY9V thin-scrollbar" style="color:#393A34;background-color:#f6f8fa"><code class="codeBlockLines_e6Vv">// Try to figure out, what changed, without knowing the details first.apply { second.apply { b = a c = b } } </code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><svg viewBox="0 0 24 24" class="copyButtonIcon_y97N"><path fill="currentColor" d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg viewBox="0 0 24 24" class="copyButtonSuccessIcon_LjdS"><path fill="currentColor" d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></button></div></div></div> <h4 class="anchor anchorWithStickyNavbar_LWe7" id="compliant-code-3">Compliant Code:<a href="#compliant-code-3" class="hash-link" aria-label="Direct link to Compliant Code:" title="Direct link to Compliant Code:"></a></h4> <div class="language-kotlin codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#393A34;--prism-background-color:#f6f8fa"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-kotlin codeBlock_bY9V thin-scrollbar" style="color:#393A34;background-color:#f6f8fa"><code class="codeBlockLines_e6Vv">// 'a' is a property of current class // 'b' is a property of class 'first' // 'c' is a property of class 'second' first.b = this.a second.c = first.b </code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><svg viewBox="0 0 24 24" class="copyButtonIcon_y97N"><path fill="currentColor" d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg viewBox="0 0 24 24" class="copyButtonSuccessIcon_LjdS"><path fill="currentColor" d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></button></div></div></div> <h3 class="anchor anchorWithStickyNavbar_LWe7" id="replacesafecallchainwithrun">ReplaceSafeCallChainWithRun<a href="#replacesafecallchainwithrun" class="hash-link" aria-label="Direct link to ReplaceSafeCallChainWithRun" title="Direct link to ReplaceSafeCallChainWithRun"></a></h3> Chains of safe calls on non-nullable types are redundant and can be removed by enclosing the redundant safe calls in a <code>run {}</code> block. This improves code coverage and reduces cyclomatic complexity as redundant null checks are removed. This rule only checks from the end of a chain and works backwards, so it won't recommend inserting run blocks in the middle of a safe call chain as that is likely to make the code more difficult to understand. The rule will check for every opportunity to replace a safe call when it sits at the end of a chain, even if there's only one, as that will still improve code coverage and reduce cyclomatic complexity. Active by default: No Requires Type Resolution Debt: 10min <h4 class="anchor anchorWithStickyNavbar_LWe7" id="noncompliant-code-4">Noncompliant Code:<a href="#noncompliant-code-4" class="hash-link" aria-label="Direct link to Noncompliant Code:" title="Direct link to Noncompliant Code:"></a></h4> <div class="language-kotlin codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#393A34;--prism-background-color:#f6f8fa"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-kotlin codeBlock_bY9V thin-scrollbar" style="color:#393A34;background-color:#f6f8fa"><code class="codeBlockLines_e6Vv">val x = System.getenv() ?.getValue("HOME") ?.toLowerCase() ?.split("/") ?: emptyList() </code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><svg viewBox="0 0 24 24" class="copyButtonIcon_y97N"><path fill="currentColor" d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg viewBox="0 0 24 24" class="copyButtonSuccessIcon_LjdS"><path fill="currentColor" d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></button></div></div></div> <h4 class="anchor anchorWithStickyNavbar_LWe7" id="compliant-code-4">Compliant Code:<a href="#compliant-code-4" class="hash-link" aria-label="Direct link to Compliant Code:" title="Direct link to Compliant Code:"></a></h4> <div class="language-kotlin codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#393A34;--prism-background-color:#f6f8fa"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-kotlin codeBlock_bY9V thin-scrollbar" style="color:#393A34;background-color:#f6f8fa"><code class="codeBlockLines_e6Vv">val x = getenv()?.run { getValue("HOME") .toLowerCase() .split("/") } ?: emptyList() </code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><svg viewBox="0 0 24 24" class="copyButtonIcon_y97N"><path fill="currentColor" d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg viewBox="0 0 24 24" class="copyButtonSuccessIcon_LjdS"><path fill="currentColor" d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></button></div></div></div> <h3 class="anchor anchorWithStickyNavbar_LWe7" id="stringliteralduplication">StringLiteralDuplication<a href="#stringliteralduplication" class="hash-link" aria-label="Direct link to StringLiteralDuplication" title="Direct link to StringLiteralDuplication"></a></h3> This rule detects and reports duplicated String literals. Repeatedly typing out the same String literal across the codebase makes it harder to change and maintain. Instead, prefer extracting the String literal into a property or constant. Active by default: No Debt: 5min <h4 class="anchor anchorWithStickyNavbar_LWe7" id="configuration-options-12">Configuration options:<a href="#configuration-options-12" class="hash-link" aria-label="Direct link to Configuration options:" title="Direct link to Configuration options:"></a></h4> <ul> <li> <code>threshold</code> (default: <code>3</code>) amount of duplications to trigger rule </li> <li> <code>ignoreAnnotation</code> (default: <code>true</code>) if values in Annotations should be ignored </li> <li> <code>excludeStringsWithLessThan5Characters</code> (default: <code>true</code>) if short strings should be excluded </li> <li> <code>ignoreStringsRegex</code> (default: <code>'$^'</code>) RegEx of Strings that should be ignored </li> </ul> <h4 class="anchor anchorWithStickyNavbar_LWe7" id="noncompliant-code-5">Noncompliant Code:<a href="#noncompliant-code-5" class="hash-link" aria-label="Direct link to Noncompliant Code:" title="Direct link to Noncompliant Code:"></a></h4> <div class="language-kotlin codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#393A34;--prism-background-color:#f6f8fa"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-kotlin codeBlock_bY9V thin-scrollbar" style="color:#393A34;background-color:#f6f8fa"><code class="codeBlockLines_e6Vv">class Foo { val s1 = "lorem" fun bar(s: String = "lorem") { s1.equals("lorem") } } </code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><svg viewBox="0 0 24 24" class="copyButtonIcon_y97N"><path fill="currentColor" d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg viewBox="0 0 24 24" class="copyButtonSuccessIcon_LjdS"><path fill="currentColor" d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></button></div></div></div> <h4 class="anchor anchorWithStickyNavbar_LWe7" id="compliant-code-5">Compliant Code:<a href="#compliant-code-5" class="hash-link" aria-label="Direct link to Compliant Code:" title="Direct link to Compliant Code:"></a></h4> <div class="language-kotlin codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#393A34;--prism-background-color:#f6f8fa"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-kotlin codeBlock_bY9V thin-scrollbar" style="color:#393A34;background-color:#f6f8fa"><code class="codeBlockLines_e6Vv">class Foo { val lorem = "lorem" val s1 = lorem fun bar(s: String = lorem) { s1.equals(lorem) } } </code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><svg viewBox="0 0 24 24" class="copyButtonIcon_y97N"><path fill="currentColor" d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg viewBox="0 0 24 24" class="copyButtonSuccessIcon_LjdS"><path fill="currentColor" d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></button></div></div></div> <h3 class="anchor anchorWithStickyNavbar_LWe7" id="toomanyfunctions">TooManyFunctions<a href="#toomanyfunctions" class="hash-link" aria-label="Direct link to TooManyFunctions" title="Direct link to TooManyFunctions"></a></h3> This rule reports files, classes, interfaces, objects and enums which contain too many functions. Each element can be configured with different thresholds. Too many functions indicate a violation of the single responsibility principle. Prefer extracting functionality which clearly belongs together in separate parts of the code. Active by default: Yes - Since v1.0.0 Debt: 20min <h4 class="anchor anchorWithStickyNavbar_LWe7" id="configuration-options-13">Configuration options:<a href="#configuration-options-13" class="hash-link" aria-label="Direct link to Configuration options:" title="Direct link to Configuration options:"></a></h4> <ul> <li> <code>thresholdInFiles</code> (default: <code>11</code>) threshold in files </li> <li> <code>thresholdInClasses</code> (default: <code>11</code>) threshold in classes </li> <li> <code>thresholdInInterfaces</code> (default: <code>11</code>) threshold in interfaces </li> <li> <code>thresholdInObjects</code> (default: <code>11</code>) threshold in objects </li> <li> <code>thresholdInEnums</code> (default: <code>11</code>) threshold in enums </li> <li> <code>ignoreDeprecated</code> (default: <code>false</code>) ignore deprecated functions </li> <li> <code>ignorePrivate</code> (default: <code>false</code>) ignore private functions </li> <li> <code>ignoreOverridden</code> (default: <code>false</code>) ignore overridden functions </li> <li> <code>ignoreAnnotatedFunctions</code> (default: <code>[]</code>) ignore functions annotated with these annotations </li> </ul></div><footer class="theme-doc-footer docusaurus-mt-lg"><div class="row margin-top--sm theme-doc-footer-edit-meta-row"><div class="col"><a href="https://github.com/detekt/detekt/edit/main/website/versioned_docs/version-1.23.8/rules/complexity.md" target="_blank" rel="noopener noreferrer" class="theme-edit-this-page"><svg fill="currentColor" height="20" width="20" viewBox="0 0 40 40" class="iconEdit_Z9Sw" aria-hidden="true"><g><path d="m34.5 11.7l-3 3.1-6.3-6.3 3.1-3q0.5-0.5 1.2-0.5t1.1 0.5l3.9 3.9q0.5 0.4 0.5 1.1t-0.5 1.2z m-29.5 17.1l18.4-18.5 6.3 6.3-18.4 18.4h-6.3v-6.2z"></path></g></svg>Edit this page</a></div><div class="col lastUpdated_JAkA"></div></div></footer></article><nav class="pagination-nav docusaurus-mt-lg" aria-label="Docs pages"><a class="pagination-nav__link pagination-nav__link--prev" href="/docs/rules/comments"><div class="pagination-nav__sublabel">Previous</div><div class="pagination-nav__label">Comments Rule Set</div></a><a class="pagination-nav__link pagination-nav__link--next" href="/docs/rules/coroutines"><div class="pagination-nav__sublabel">Next</div><div class="pagination-nav__label">Coroutines Rule Set</div></a></nav></div></div><div class="col col--3"><div class="tableOfContents_bqdL thin-scrollbar theme-doc-toc-desktop"><ul class="table-of-contents table-of-contents__left-border"><li><a href="#cognitivecomplexmethod" class="table-of-contents__link toc-highlight">CognitiveComplexMethod</a></li><li><a href="#complexcondition" class="table-of-contents__link toc-highlight">ComplexCondition</a></li><li><a href="#complexinterface" class="table-of-contents__link toc-highlight">ComplexInterface</a></li><li><a href="#cyclomaticcomplexmethod" class="table-of-contents__link toc-highlight">CyclomaticComplexMethod</a></li><li><a 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