Credence.Pattern.NoEmptyMapNew
(credence v0.7.1)
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Detects Map.new() called with no arguments and suggests the empty map
literal %{} instead.
Why this matters
Map.new() with zero arguments returns an empty map, identical to %{}.
The literal %{} is the idiomatic Elixir way to express an empty map —
it is shorter, more recognizable, and what every Elixir developer would
reach for.
LLMs sometimes generate Map.new() because Map.new/1 and Map.new/2
are the idiomatic way to build a map from an enumerable. The zero-argument
form is a misgeneralization of that pattern.
Flagged patterns
| Pattern | Suggested replacement |
|---|---|
Map.new() | %{} |
Only the zero-argument call is targeted. Map.new(enum), Map.new(enum, fun),
and piped forms like enum |> Map.new() are all idiomatic and left alone.