Credence.Pattern.NoGraphemePalindromeCheck (credence v0.5.0)

Readability & performance rule: Detects the pattern of decomposing a string into graphemes or a charlist, only to compare it with its own Enum.reverse.

This pattern creates an unnecessary intermediate list. Use String.reverse/1 and compare strings directly instead.

Bad

graphemes = String.graphemes(s)
graphemes == Enum.reverse(graphemes)

codepoints = String.to_charlist(s)
codepoints == Enum.reverse(codepoints)

normalized = s |> String.downcase() |> String.graphemes()
normalized == Enum.reverse(normalized)

Good

cleaned = String.downcase(s)
cleaned == String.reverse(cleaned)