Short question:
What is the best way to create relationships between my types so it is easy
to access data present in both types?
Long question:
Suppose I have the following types:
type alias Person =
{ name : String
, address : String
, personType : PersonType
}
type alias Employee =
{ department : String }
type alias Customer =
{ itemsPurchased : Int }
type PersonType = EmployeeType Employee | CustomerType Customer
Then I think it's not straight forward to write a function that retrieves
me the department and name for an employee:
nameAndDepartment : Person -> (String, String)
It seems to me this function would be a Maybe (String, String) and return
Nothing if the Person is not an Employee. But in that case, I am relying on
the runtime to type check things for me, which tells me there is probably a
better way to structure this.
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