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Example code of tomasvotruba/cognitive-complexity

Informations about the package cognitive-complexity

Keep Cognitive Complexity Down


Cognitive complexity tells us, how difficult code is to understand by a reader.

How is cognitive complexity measured?

This function uses nesting, conditions and continue back and forth. It's hard to read and results in cognitive complexity of 4.

How to keep cognitive complexity on 1? Read Keep Cognitive Complexity Low with PHPStan post to learn it.


Install

The package is available on PHP 7.2-8.1 versions in tagged releases.


Usage

With PHPStan extension installer, everything is ready to run.

Enable each item on their own with simple configuration:


Detect complex Class Dependency Trees

In classes like controllers, Rector rules, PHPStan rules or other services of specific type, the complexity can be hidden in the __construct() dependencies. Simple class with 10 dependencies is more complex than complex class with 2 dependencies.

That's why there is a rule to detect these dependency trees. It checks:

Final number is compared and used as a final complexity:


Happy coding!

All versions of cognitive-complexity with dependencies

PHP Build Version
Package Version
Requires php Version ^7.4 || ^8.0
phpstan/phpstan Version ^2
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