Use casecmp instead of downcase

MITLibraries · Jan 14, 2025 · 1f8d59c · 1f8d59c
1 parent 2e4986c
commit 1f8d59c
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/app/models/detector/standard_identifiers.rb b/app/models/detector/standard_identifiers.rb
@@ -102,7 +102,7 @@ def valid_isbn?(candidate)
     def valid_isbn_10?(digits)
       sum = 0
       digits.each_with_index do |digit, index|
-        digit = '10' if digit.downcase == 'x'
+        digit = '10' if digit.casecmp('x').zero?
         sum += digit.to_i * (10 - index)
       end
       (sum % 11).zero?