Number Feels

num_feels.rb

class NumFeels

  attr_reader :number
  def initialize(number)
    @number = number
  end

  def happy? 
    fail ArgumentError if number < 0
    sum = 0
    i = number
    while [1,4,0].exclude? i
      sums = []
      i.to_s.split('').each do |digit|
        sums << digit.to_i**2
      end
      sum = sums.inject(0, &:+)
      return true if sum == 1
      i = sum
    end
    false
  end

  def perfect? 
    factors = proper_factors_of(number)
    sum = factors.inject(0, &:+)
    sum == number
  end

  def friendly?
  end

  def solitary?
  end
  
  private

  def proper_factors_of(n)
    (1..n/2).select{|e| (n%e).zero? } 
  end
end