In this series of articles we have been discussing methods that can be applied to reduce cyclomatic complexity of code. It is a practice that if the result of cyclomatic complexity is more or a bigger number, we consider that piece of functionality to be of complex nature and hence we conclude as a tester; that the … Cyclomatic complexity of a code section is the quantitative measure of the number of linearly independent paths in it. Unnecessary complexity leads to bugs. As a QA we can use this technique to identify the “level” of our testing. Its simple, its readable, its maintainable (for now), if it gets bigger in the future the CC will skyrocket exponentially and it will get the attention it needs when it needs needs it, not before. If you are writing test cases, you have to keep an eye on the cyclomatic complexity. Lower Costs When the risk of potential defects is reduced, there are fewer defects to find—and remove. Here the cyclomatic complexity will be as follows Cyclomatic Complexity = if for case1+if for case2+else+1=4 Cyclomatic complexity has more significance on the field of testing and maintainability. Cyclomatic complexity for this method is 19 and it’s too complex. It starts from the precedents set by Cyclomatic Complexity, but uses human judgement to assess how structures should be counted, and to decide what …

So, you can see why the cyclomatic complexity of the UpdateQuantity() would be crazy to debug. It reduces the coupling of code. If you had a nested IF statement (one IF and another IF in the true section), you would have a cyclomatic complexity of 3. In some cases, it is really not possible at first site. Static code analysis tools are typically used to calculate cyclomatic complexity and other code complexity metrics. Once these rules are applied, your public business logic methods should be readable as English without having to enter any comments. Many developers would have scratched their heads in order to keep their Cyclomatic complexity under 10. Cyclomatic Complexity is merely a guide to complexity, and you are using it poorly if you change this function based on it. Domain logic is exposed in such code, while scaffolding is moved away from it. Cognitive Complexity breaks from the practice of using mathematical models to assess software maintainability. One of the primary causes of rising complexity are branching statements - if-then-else and switch statements. Given that, by reducing code complexity, you reduce the risk of introducing defects; whether they’re small or large, slightly embarrassing or bankruptcy-inducing.

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