DynamicObj

F# library supporting Dynamic Objects including inheritance in functional style.

The library is compatible with Fable, allowing transpilation to javascript and python.

Usage example

Get started

#r "nuget: DynamicObj"
#r "nuget: Fable.Core" // Needed if working with Fable

open DynamicObj
open Fable.Core // Needed if working with Fable

[<AttachMembers>] // AttachMembers needed if working with Fable
type Person(id : int, name : string) =
    
    // Include this in your class
    inherit DynamicObj()

    let mutable name = name

    // Mutable property
    member this.Name
        with get() = name
        and set(value) = name <- value

    // Immutable property
    member this.ID 
        with get() = id

let p = Person(1337,"John")

Accessing static and dynamic properties

// Access Static Properties
p.GetValue("Name") // val it: obj = "John"
p.GetValue("ID")   // val it: obj = 1337


// Overwrite mutable static property
p.SetValue("Name","Jane") // val it: unit = ()
// Overwrite immutable static property
p.SetValue("ID",1234) // System.Exception: Cannot set value for static, immutable property "ID"
// Set dynamic property
p.SetValue("Address","FunStreet") // val it: unit = ()


// Access Properties
p.GetValue("Name")    // val it: obj = "Jane"
p.Name                // val it: string = "Jane"
p.GetValue("ID")      // val it: obj = 1337
p.ID                  // val it: int = 1337
p.GetValue("Address") // val it: obj = "FunStreet"

Practical helpers

DynObj.format p
|> printfn "%s"

->

Name: Jane
ID: 1337
?Address: FunStreet

Development

Requirements

• nodejs and npm
  • verify with node --version (Tested with v18.16.1)
  • verify with npm --version (Tested with v9.2.0)
• .NET SDK
  • verify with dotnet --version (Tested with 7.0.306)
• Python
  • verify with py --version (Tested with 3.12.2, known to work only for >=3.11)

Local Setup

On windows you can use the setup.cmd to run the following steps automatically!

1. Setup dotnet tools