no_while.rb

require 'pry'
VALID_INPUT = [1,2,3,4]
@products = []

def get_choice
  puts 'Enter your selection'
  choice = gets.chomp.to_i
  validate_choice(choice)
  scan(choice)
end

def validate_choice(choice)
  if !VALID_INPUT.include?(choice)
    puts 'I hate you'
    get_choice
  end
end

def scan(choice)
  if finished?(choice)
    puts @products
  else
    @products << choice
    get_choice
  end
end

def finished?(choice)
  choice == 4
end