F# Type Extensions

by Online Tutorials Library July 14, 2022

F# Type Extensions

Type extension allows you to add new members to your previously defined object type.

The syntax of Type Extensions in F# language is given below:

  // Intrinsic extension.  type typename with      member self-identifier.member-name =          body      …  [ end ]    // Optional extension.  type typename with      member self-identifier.member-name =          body      …  [ end ]  

F# Type Extension Example

In the following example, we are adding new method to previous defined class. Here, we are calling methods by using a single object of the class.

  type ClassExtension() =   member this.ShowBefore() = printfn”Class before extension”    // Define type extension.  type ClassExtension with   member this.ShowAfter() = printfn”Class after extension”    let classExtension = new ClassExtension()  classExtension.ShowBefore()  classExtension.ShowAfter()  

Output:

Class before extension  Class after extension

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