elixir-code-review

Elixir Code Review

Quick Reference

Issue Type	Reference
Naming, formatting, module structure	references/code-style.md
With clauses, guards, destructuring	references/pattern-matching.md
GenServer, Supervisor, Application	references/otp-basics.md
@moduledoc, @doc, @spec, doctests	references/documentation.md

Review Checklist

Code Style

• Module names are CamelCase, function names are snake_case
• Pipe chains start with raw data, not function calls
• Private functions grouped after public functions
• No unnecessary parentheses in function calls without arguments

Pattern Matching

• Functions use pattern matching over conditionals where appropriate
• With clauses have else handling for error cases
• Guards used instead of runtime checks where possible
• Destructuring used in function heads, not body

OTP Basics

• GenServers use handle_continue for expensive init work
• Supervisors use appropriate restart strategies
• No blocking calls in GenServer callbacks
• Proper use of call vs cast (sync vs async)

Documentation

• All public functions have @doc and @spec
• Modules have @moduledoc describing purpose
• Doctests for pure functions where appropriate
• No @doc false on genuinely public functions

Security

• No String.to_atom/1 on user input (use to_existing_atom/1)
• No Code.eval_string/1 on untrusted input
• No :erlang.binary_to_term/1 without :safe option

Valid Patterns (Do NOT Flag)

• Empty function clause for pattern match - def foo(nil), do: nil is valid guard
• Using |> with single transformation - Readability choice, not wrong
• @doc false on callback implementations - Callbacks documented at behaviour level
• Private functions without @spec - @spec optional for internals
• Using Kernel.apply/3 - Valid for dynamic dispatch with known module/function

Context-Sensitive Rules

Issue	Flag ONLY IF
Missing @spec	Function is public AND exported
Generic rescue	Specific exception types available
Nested case/cond	More than 2 levels deep

When to Load References

• Reviewing module/function naming → code-style.md
• Reviewing with/case/cond statements → pattern-matching.md
• Reviewing GenServer/Supervisor code → otp-basics.md
• Reviewing @doc/@moduledoc → documentation.md

Before Submitting Findings

Load and follow review-verification-protocol before reporting any issue.