Stop creating Array in method which is called multiple times

after.rb

APARTMENT_TYPES = %w[apartment flat penthouse duplex maisonette]
HOUSE_TYPES     = %w[house home villa bungalow detached terraced]

def extract_property_type(details)
  return :studio if details.include?('studio')

  APARTMENT_TYPES.each do |type|
    return :apartment if details.include?(type)
  end

  HOUSE_TYPES.each do |type|
    return :house if details.include?(type)
  end

  nil
end

before.rb

def extract_property_type(details)
  return :studio if details.include?('studio')
  ['apartment', 'flat', 'penthouse', 'duplex', 'maisonette'].each do |type|
    return :apartment if details.include?(type)
  end
  ['house', 'home', 'villa', 'bungalow', 'detached', 'terraced'].each do |type|
    return :house if details.include?(type)
  end
  nil
end

object_allocation.rb

# This shows that each time you call the method, it creates new array!
def extract_property_type
  property_types = ['apartment', 'flat', 'penthouse', 'duplex', 'maisonette']
  puts property_types.object_id
end

3.times { extract_property_type }