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@essic essic/main.fs
Created Jun 18, 2018

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SimpleFSharpDemo-03 created by essic - https://repl.it/@essic/SimpleFSharpDemo-03
module Implem03
open System
type Age = int
type FirstName = string
type LastName = string
type Person =
{ FirstName : FirstName
LastName : LastName
Age : Age }
type ConsultantSkills =
| CSharp
| FSharp
| Java
| Finance
| ECommerce
type ManagerBU =
| SGCIB
| Natixis
| BNP
type Collaborator =
| Consultant of Person * (ConsultantSkills list)
| Manager of Person * ManagerBU
let isNull a =
//List.fold : ('State -> 'T -> 'State) -> 'State -> 'T list -> 'State
a |> List.fold (fun state str -> state || String.IsNullOrWhiteSpace(str) ) false
let createPerson firstName lastName age =
if ( age < 0 ) || (isNull [firstName; lastName]) then
None
else
{ FirstName = firstName ; LastName = lastName ; Age = age } |> Some
let createConsultant firstName lastName age skills =
createPerson firstName lastName age
|> Option.map (fun person -> Consultant (person,skills) )
let createManager firstName lastName age bu =
createPerson firstName lastName age
|> Option.map (fun person -> Manager (person,bu))
let whoAreYou collaborator =
match collaborator with
| Consultant (p,_) -> printfn "I am a %i years old, consultant. My name is %s %s" p.Age p.FirstName p.LastName
| Manager (p,_) -> printfn "I am a %i years old, manager. My name is %s %s" p.Age p.FirstName p.LastName
collaborator
let whatDoYouDo collaborator =
match collaborator with
| Manager (_,businessUnit) -> printfn "I handle business on %s" <| sprintf "%A" businessUnit
| Consultant (_,skills) ->
match skills with
| [] -> printfn "I have no skills yet !" // I handle the case where skills is an empty list !
| _ -> // For any other case !
let skillsString = List.reduce (fun acc elem -> acc + ", " + elem) ( skills |> List.map (sprintf "%A") )
printfn "I work on %s" skillsString
collaborator
let customPrint collaborator =
printfn "***********************"
collaborator
|> (whoAreYou >> whatDoYouDo) |> ignore
printfn "***********************"
[<EntryPoint>]
let main argv =
// We create some collaborators
let collaborators =
[
createConsultant "Aly-Bocar" "Cisse" 32 [CSharp;FSharp]
createManager "Luffy" "Dragon" 20 SGCIB
createConsultant "Nobody" "Ulysse" 15 []
createManager "Kevin" "" 25 Natixis //Should fail !
createConsultant null "Something" 30 [Java] //Should fail !
createConsultant "Gandalf" "The Gray" -200 [Finance] // Should fail !
]
//Let's iterate on every Collaborator and print !
collaborators
|> List.iter (Option.map customPrint >> ignore)
0
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