PEuler 34

PE34.rb

 
class Machine
   attr_accessor :facts
   
   def initialize
     @facts = {}
     fill_facts
   end 
   def find_sum
     upper = @facts['9']*3
     cur_sum = 0
     (3..upper).each do |j|
       cur_sum += j if curious?(j)
     end
     puts cur_sum
   end
   
   private
     def fact(num)
       return 1 if num == 0
       tot = 1
       num.downto(1) do |i|
         tot *= i
       end
       tot
     end
 
     def fill_facts
       10.times do |i|
         facts[i.to_s] = fact(i)
       end
     end
     
     def curious?(num)
       num_as_arr = num.to_s.split(//)
       fact_tot = 0
 
       num_as_arr.each do |n|
         fact_tot += @facts[n]
       end
       fact_tot == num
     end
 end
 
 m = Machine.new
 m.find_sum