ruby.rb

def find(*array)
  set1 = ["cat", "dog"]
  set2 = ["apple", "orange"]
  
  if (array & set1).size.positive? || (array & set1).size.positive?
    return 1
  elsif (array  & set1 & set2).size.positive?
    return 2
  end
  
end

find(["cat", "apple"]) #=> 2
find(["cat", "dog"])  #=> 1
find(["apple", "dog"])  #=> 2
find(["orange"]) #=> 1

ANIMALS = %w[cat dog].freeze
FRUIT = %w[apple orange].freeze
CATAGORIES = [ANIMALS, FRUIT].freeze

def count_catagories(items, categories = CATAGORIES)
  categories.reduce 0 do |count, category|
    next count.next if items.any? { |item| category.include? item }
    count
  end
end

  categories.sum do |category|
    next 1 if items.any? { |item| category.include? item }
    0
  end