obj_to_func_0.rb

class NumberAnalyzer
  attr_accessor :numbers
  
  def initialize(numbers)
    @numbers = numbers
  end
  
  def print_factorials
    numbers.each do |num|
      puts "#{num}! = #{factorial(num)}"
    end
  end
  
  private
  
  def factorial(n)
    if n == 0
      1
    else
      n * factorial(n - 1)
    end
  end
end

analyzer = NumberAnalyzer.new([0, 1, 2, 3, 4, 5, 10])
analyzer.print_factorials
  # Prints:
  # 0! = 1
  # 1! = 1
  # 2! = 2
  # 3! = 6
  # 4! = 24
  # 5! = 120
  # 10! = 3628800