On 17 Jun 2021, at 5:43 pm, Joshua <joshua.oconno...@gmail.com> wrote:
Hello,
I have 2 questions about idiomatic ways to represent optional values,
and variant values in types.
1) I'm modelling a data type which has a field which may or may not be
there, would most Gophers reach for a pointer here, and use `nil' to
represent a missing value?
2) Another field of this type contains an "Action", the variants of
which hold different information. In nonsense code, I want this:
,----
| type EmailAction struct {
| Summary string
| Decsription string
| To string
| Attendee person
| }
|
| type DisplayAction struct {
| Description string
|
| }
|
| type Event struct {
| OptionalField *MyType
| Action EmailAction OR DisplayAction
| }
`----
How would you go about modelling this type in Go? Or alternatively, do
you think trying to use "Type Driven Design" like this is not a good fit
for Go, and rather I should just have a generic set of components and
validate when functions call it.
Personally I prefer the previous, I really like the idea of knowing a
type can't exist in an invalid state! Helps me not have to keep track of
so much in my head.
I will share my thinking for (2):
You could do something like this:
type Action interface {
# your methods
}
type Event struct {
OptionalField *MyType
Action field
}
In your code:
e := Event{..}
Switch e.field.(type):
case “EmailAction”: do somehting
case “DisplayAction”: do something else
default: Invalid action
}
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