Created
December 27, 2015 02:19
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| open System | |
| type Maybe<'a> = | |
| | Just of 'a | |
| | Nothing | |
| let Unit (x: 'a) : Maybe<'a> = | |
| Just x | |
| let Bind (f: 'a -> Maybe<'b>) (mx: Maybe<'a>) = | |
| match mx with | |
| | Just x -> f x | |
| | Nothing -> Nothing | |
| let Example1 x = | |
| Unit(x) | |
| |> Bind (fun x -> Unit(x + 4)) | |
| |> Bind (fun x -> Unit(x * 100)) | |
| |> Bind (fun x -> if x >= 2400 then Unit(x) else Nothing) | |
| let Example2 x = | |
| Unit(x) | |
| |> Bind (fun x -> if x = 0 then Nothing else Unit(x)) | |
| |> Bind (fun x -> Unit(50 / x)) | |
| let PrintVal (x:Maybe<'a>) : unit = | |
| match x with | |
| | Just x -> Console.WriteLine(x.ToString()) | |
| | Nothing -> Console.WriteLine("No value returned") | |
| [<EntryPoint>] | |
| let main argv = | |
| 20 |> Example1 |> PrintVal | |
| 10 |> Example1 |> PrintVal | |
| 0 |> Example2 |> PrintVal | |
| 10 |> Example2 |> PrintVal | |
| 0 |
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