$ scala Person 30 Fred 4000
We have a person: Person(30,Fred,4000)

$ scala Person "-7" red 490000
Postcode must be 4 digits
Name must begin with a capital letter
Age must be greater than 0

$ scala Person boo Fred 490000
Postcode must be 4 digits
java.lang.NumberFormatException: For input string: "boo"

$ scala Person 30 "" 411x
Postcode must be 4 digits
Name must begin with a capital letter