View Source Credo.Check.Refactor.CyclomaticComplexity (Credo v1.7.10)

Basics

This check is enabled by default.

Learn how to disable it via .credo.exs.

This check has a base priority of 0 and works with any version of Elixir.

Explanation

Cyclomatic complexity (CC) is a software complexity metric closely correlated with coding errors.

If a function feels like it's gotten too complex, it more often than not also has a high CC value. So, if anything, this is useful to convince team members and bosses of a need to refactor parts of the code based on "objective" metrics.

Check-Specific Parameters

Use the following parameters to configure this check:

:max_complexity

The maximum cyclomatic complexity a function should have.

This parameter defaults to 9.

General Parameters

Like with all checks, general params can be applied.

Parameters can be configured via the .credo.exs config file.

Summary

Functions

complexity_for(ast)

Returns the Cyclomatic Complexity score for the block inside the given AST, which is expected to represent a function or macro definition.

Functions

Link to this function

complexity_for(ast)

View Source

Returns the Cyclomatic Complexity score for the block inside the given AST, which is expected to represent a function or macro definition.

iex> {:def, [line: 1],
...>   [
...>     {:first_fun, [line: 1], nil},
...>     [do: {:=, [line: 2], [{:x, [line: 2], nil}, 1]}]
...>   ]
...> } |> Credo.Check.Refactor.CyclomaticComplexity.complexity_for
1.0