Basics
This check is disabled by default.
Learn how to enable it via .credo.exs.
This check has a base priority of high and works with any version of Elixir.
Explanation
Replace Map.get(map, key) || fallback with Map.get/3 or boundary normalization.
Why
Map.get/2 || fallback silently treats false as missing data and
encourages call sites to fish through input shapes instead of defining
one shape at the boundary. LLMs frequently produce this when they are
unsure whether a value lives under one key, another key, or another map.
How to fix
# BEFORE
Map.get(opts, :retries) || 0
# AFTER
Map.get(opts, :retries, 0)If the fallback is another source, normalize the input once at the ingestion boundary and read the normalized key locally.
What NOT to do
Do not chain Map.get/2 calls with || to support several possible
input shapes. That hides schema drift and turns every consumer into a
partial data-normalization layer.
Check-Specific Parameters
There are no specific parameters for this check.
General Parameters
Like with all checks, general params can be applied.
Parameters can be configured via the .credo.exs config file.