#12

class ArrayMapper
  attr_accessor :arrays

  def initialize(*arrays)
    @arrays = arrays
  end

  def map_arrays
    @arrays.map.with_index do |array, index|
      array.map { |element| element + index }
    end
  end

  def sum_arrays
    @arrays.reduce([]) do |sum_array, array|
      if sum_array.empty?
        array
      else
        sum_array.zip(array).map { |a, b| a + b }
      end
    end
  end

  def product_arrays
    @arrays.reduce([]) do |product_array, array|
      if product_array.empty?
        array
      else
        product_array.zip(array).map { |a, b| a * b }
      end
    end
  end

  def perform_operations
    {
      mapped: map_arrays,
      summed: sum_arrays,
      product: product_arrays,
    }
  end
end

# Usage:
mapper = ArrayMapper.new([1, 2, 3], [4, 5, 6], [7, 8, 9])
puts mapper.perform_operations.inspect