I really like this project. It is based on principles i can get behind.

Since this is a web based programming language - i really would like to know how to interop with JavaScript.

In my case i need to use the pixi.js renderer

The goal is to be less-verbose. You are able to use tansducer-based functions (map, filter, ...) on any datastructure that is iterable. For me, performance is a bonus.

I do not know how this compares to a monad/monoid. If anyone can explain, please go ahead. Thx!

Monad/Monoid are a different category of things from transducers—think of them more like an interface than a thing. For instance, a basic model of Transducer is as follows

    type Trans a b = forall r . (r -> b -> r) -> (r -> a -> r)

and it turns out that this is isomorphic to (e.g. an optimization of) the list Kleisli arrow

    type KleiList a b = a -> [b]

and lists are monads. For a slightly different reason, this argumentation leads me to believe that Transducers ought to be monads via the Reader/List transformer stack. I haven't verified it, however.

Transducers could be monoids, too. You'd need to have two operations like so

    zero :: Transducer a b
    add  :: Transducer a b -> Transducer a b -> Transducer a b

and perhaps there would be necessary restrictions on the choices of `a` and `b`. It's immediately obvious we could make this work if `a` and `b` were equal

    zero :: Transducer a a
    add  :: Transducer a a -> Transducer a a -> Transducer a a

as this is now just the "identity" transducer and transducer composition which satisfy all the laws of monoid.

You are able to use transducers on any datastructure that implements the protocol. Which means usually implementing it yourself.

for/of solves this in JavaScript. I don't see the usability improvement this presents. I'm not being a naysayer. I hope I'm wrong here, I'm just asking.