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#light syntax for constructors
f#

Hi,

I've started using the following format for constructing objects:

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module Dsl = 
    let inline P x y z = Point3D(float x, float y, float z)
    let inline V x y z = Vector3D(float x, float y, float z)

open Dsl

type Simple3DScene() as this = 
    inherit Window()
    
    let cam = PerspectiveCamera( P -2 0 5, V 0 0 -1, V 0 1 0, 45.)
    let scroll = 
        ScrollBar(
            Orientation = Orientation.Horizontal,
            Value = -2., Minimum = -2., Maximum = 2.
            )
    let mesh = 
        MeshGeometry3D(
            Positions = Point3DCollection [| P 0 0 0; P 0 1 -1; P 0 0 -1 |],
            TriangleIndices = Int32Collection [| 0; 1; 2 |]                     
        )

one of the great benefits of #light syntax is that top-level and
nested functions have identical syntax so that you can quickly extract or nest functions
without a constant (and error-prone) re-editing. There is a self-similarity to the code that's
very pleasing and productive.

I was hoping that perhaps object contructors could benefit from this principle so:

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type Simple3DScene() as this = 
    inherit Window()
    
    let cam = PerspectiveCamera( P -2 0 5, V 0 0 -1, V 0 1 0, 45.)
    let scroll = 
        ScrollBar
            Orientation = Orientation.Horizontal
            Value = -2., Minimum = -2., Maximum = 2.
    let mesh = 
        MeshGeometry3D
            Positions = Point3DCollection [| P 0 0 0; P 0 1 -1; P 0 0 -1 |]
            TriangleIndices = Int32Collection [| 0; 1; 2 |]

parentheses and end of line comma's have been elided which is more readable and allows new named arguments to be added quickly and without editing the format of the constructor. It would also allow for simpler nesting of constructors.

perhaps using a keyword (e.g. with) after the type name could help indicate intent.

anyhow, just an idea.

regards,

Danny

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