F# Interface

by Online Tutorials Library July 14, 2022

F# Interface

F# provides Interface type. It provides pure abstraction. It is a collection of abstract methods. A Class which implements interface must provide definition for its all methods.

Syntax:

 // Interface declaration: [ attributes ] type interface-name =     [ interface ]     [ inherit base-interface-name …]     abstract member1 : [ argument-types1 -> ] return-type1     abstract member2 : [ argument-types2 -> ] return-type2     … [ end ] 

F# Interface Example

In this example we have created an interface and implemented it into a class.

 type IEmployee =    abstract member ShowName : unit -> unit  type Manager(id:int, name:string) =    interface IEmployee with       member this.ShowName() = printfn “Id = %d nName = %s” id name  let manager = new Manager(100,”RajKumar”) //manager.ShowName()    // error: you can’t directly access interface abstract method by using class object. // so, we need to upcast class type object to interface type by using :> operator. (manager :> IEmployee).ShowName() 

Output:

Id = 100 Name = RajKumar

Next TopicF# Type Extensions

F# Interface

F# Interface

F# Interface Example

Install Express.js

Data Organization in Firebase Real time Database

You may also like