faker-ruby/faker · error · ArgumentError

base must be 10 or 13

Error message

base must be 10 or 13

What it means

Error "base must be 10 or 13" thrown in faker-ruby/faker.

Source

Thrown at lib/faker/default/code.rb:36

      end

      ##
      # Produces a random ISBN (International Standard Book Number) code.
      #
      # @param base [Integer] the length of the code to generate (either 10 or 13)
      # @return [String]
      #
      # @example
      #   Faker::Code.isbn(base: 13) #=> "896579606969-8"
      # @example
      #   Faker::Code.isbn #=> "170366802-2"
      #
      # @faker.version 2.2.0
      def isbn(base: 10)
        case base
        when 10 then generate_base10_isbn
        when 13 then generate_base13_isbn
        else raise ArgumentError, 'base must be 10 or 13'
        end
      end

      ##
      # Produces a random EAN (European Article Number) code.
      #
      # @param base [Integer] the length of the code to generate (either 8 or 13)
      # @return [String]
      #
      # @example
      #   Faker::Code.ean(base: 8) #=> "36941070"
      # @example
      #   Faker::Code.ean #=> "9941880131907"
      #
      # @faker.version 2.2.0
      def ean(base: 13)
        case base
        when 8 then generate_base8_ean

View on GitHub (pinned to cca4184947)

When it happens

Trigger: Thrown at lib/faker/default/code.rb:36 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of faker-ruby/faker@cca4184947 (2026-08-21). Data as JSON: /api/errors/29d060523b149573. Report an issue: GitHub.