When doing this kind of pattern matching it's generally best to add a last catch all case:
match x with
| :? string -> "x is a string"
| :? int -> "x is an int"
| :? Exception -> "x is an exception"
| _ -> Printf.sprintf "x is a %A" (x.GetType())
Because there are input values for x that aren't matched by any pattern, e.g.
getType System.DateTime.Now
throws a Microsoft.FSharp.Core.MatchFailureException because System.DateTime isn't matched
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Built with WebSharper |
According to 'F# 1.9.6 Language Reference', Page 11
let getType (x : obj) =
match x with
| :? string -> "x is a string"
| :? int -> "x is an int"
| :? Exception -> "x is an exception"
I got warning FS0025. Why? Thanks!