# What is a dig in k-lang?

dig is the same as get on an Option data-type, so to get the value of an optional field use dig

Note: Use dig only when you are sure the value exists

Example:

command addParticipant{
  input(lotteryName:String,participantName:String,email:String?)
  pre{
	 condition validEmail => 
	 		present(input.email) -> genericDomain.isValidEmail(input.email.dig) failing "Email is invalid."
  }
  ...
}