Hi, I’m trying to find a way to go further with a mini-game project, with rescript version 8.4.2 (using its ocaml syntax 4.06.1). I reached a point where I need ( / want) to define several kind of enemies (not only one) and I’m wondering how to do so. Using OO would have been just perfect for the t…

@polymorphism: Yes, it’s polymorphic as I already explained, because here I aggregate all needed fields for all different kind of entities. Here how it looks like with a print and an update methods: type entity = { a: int; b: float; c: int * int; update: entity -> entity; print: entity ->…

Well maybe. It looks pretty unappealing and difficult to extend. It is not OO as normally envisaged, but if it floats your boat go with it.

[image] cvine: Well maybe. It looks pretty unappealing and difficult to extend. I share your opinion about it. The right way would be to use real objects but objects don’t work with rescript. Your alternative also have a drawback: I’m not able to figure out the right syntax by myself. […

[image] fccm: It’s not that trivial with GADT, first class modules and functors. It’s not so difficult. Here with the last example of Printable: module Printable = struct module type S = sig type t val print : t -> unit val update : t -> t end type 'a meth = (module S with…

[image] fccm: The idea doesn’t come from me. It comes from other ocaml programmers who are explaining that we can use records to fake OO. But these are (presumably) for records holding closures. In other words, using my first example but with record syntax instead of first-class module synta…

[image] fccm: I share your opinion about it. The right way would be to use real objects but objects don’t work with rescript. I’m not sure what your goals are. But if you simply want to compile to JavaScript, I’m pretty sure js_of_ocaml handles them perfectly.

Thanks, Daniel, but as I already told you, the problem with joo is that I’ve never been able to use it by myself. Not even after several afternoons. I had no difficulties with rescript. And maybe melange will fix OO.

Maybe if you explain which problems you ran into we can help you. I don’t think there’s anything particularly complicated in using js_of_ocaml. Maybe checkout brr’s webpage howto which has both bare-bone and dune instructions to get you started.

[image] cvine: [image] fccm: The idea doesn’t come from me. It comes from other ocaml programmers who are explaining that we can use records to fake OO. But these are (presumably) for records holding closures. In other words, using my first example but with record syntax instead of first…

[image] dbuenzli: Maybe if you explain which problems you ran into we can help you. I did. I’m not angry no one gave me a solution when I did. I know answers are made by volunteers, and that they do it for free, and that they can not do it all the time.

OO with rere? how to work-around?

Learning

dbuenzli September 16, 2022, 12:52pm 33

I’m not sure what your goals are. But if you simply want to compile to JavaScript, I’m pretty sure js_of_ocaml handles them perfectly.

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OO with rere? how to work-around?

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