Credo Checks

Understanding and fixing common Credo issues.

Check Categories

Consistency Checks

Ensure consistent code style across the project.

Design Checks

Identify design issues and anti-patterns.

Readability Checks

Improve code readability and maintainability.

Refactoring Checks

Highlight refactoring opportunities.

Warning Checks

Catch potential bugs and issues.

Common Issues

Module Documentation

Issue: Missing module documentation

defmodule MyModule do end

Fixed

@moduledoc """ This module handles user authentication. """ defmodule MyModule do end

Function Complexity

Issue: High cyclomatic complexity

def complex_function(x) do if x > 10 do if x < 20 do if rem(x, 2) == 0 do :even_mid else :odd_mid end else :high end else :low end end

Fixed: Extract to separate functions

def classify_number(x) do case {x > 10, x < 20, rem(x, 2) == 0} do {false, _, _} -> :low {true, false, _} -> :high {true, true, true} -> :even_mid {true, true, false} -> :odd_mid end end

Pipe Chain

Issue: Single pipe

list |> Enum.map(&(&1 * 2))

Fixed

Enum.map(list, &(&1 * 2))

Unused Variables

Issue

def process({:ok, result}, _context) do result end

Fixed: Prefix with underscore

def process({:ok, result}, _context) do result end