Funcadelic casting

[taras]

I keep seeing a need for some way to cast one type to another.

You can see this in 3 places in current Microstates: Type -> TypeTree, TypeTree -> Transitions, TypeTree -> States.

I'm currently doing this with a static method, but when a TypeClass is created the static method becomes inaccessible.

Something funcadelic might look like this,

import { cast } from 'funcadelic';

let transitions = cast(tree, Transitions);

Internally, it might look something like this:

export const Castable = type(class Castable {});
 
function cast(t, Type) {
   return Castable(Type).cast(t);
}

Castable(Type).cast needs to match t to many potential targets. We don't have a pattern for matching many types to many types of data.

What's the funcadelic way of doing this?