Variants and option
Variants model a fixed set of cases, and option models absence.
What you will be able to do
- Define type with | cases.
- Use Some and None.
- Match all cases.
In plain English
Variants model a fixed set of cases, and option models absence.
- Define type with | cases.
- Use Some and None.
- Match all cases.
type result = Ok of string | Error of string
let render = function
| Ok value -> value
| Error message -> message
let () = print_endline (render (Ok "ready"))Your turn
EasyExplain it back
Answer from memory: Which type models an optional value?
TEXT · starter
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Knowledge checkQuestion 1
Which type models an optional value?
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