gistfile1.rb

def self.user_types
  [:candidate, :influencer, :employee]
end

User.user_types.each do |user_type|
  define_method "#{user_type}?" do
    !!send(user_type)
  end
end

def is_type?(user_type)
  user_type = user_type.to_sym
  
  raise "Not a valid User type." unless User.user_types.member? user_type
  
  send("#{user_type}?")
end