Improvement in defining methods.

numeric.rb

class Numeric
  [['multiply', '*'], ['divide', '/'], ['add', '+'], ['subtract', '-']].each do |method, operator|
    define_method("#{method}_10") do
      method(operator).call(10) # line not readable, should be something like self + 10, self - 10, etc...
    end
  end
end

puts 40.add_10
puts 40.subtract_10
puts 40.divide_10
puts 40.multiply_10

numeric_improved.rb

class Numeric
  [['multiply', '*'], ['divide', '/'], ['add', '+'], ['subtract', '-']].each do |method, operator|
    module_eval %{
      def #{method}_10
        self.#{operator}(10)
      end
    }
  end
end


['multiply', 'divide', 'add', 'subtract'].each { |method| eval %{ puts 40.#{method}_10 } }