prowl VS HADWIN

Functors can help remove a lot of code duplication. For example, the language I am working on has a big equational unification framework for its type system, and I can compose unifiers easily by making them meet some common specification and tying things together. Without functors, I would need to have callback arguments and extra constants in a bunch of the functions, and each function relevant to each unifier would have to be tied together individually, which would be a terrible mess.

I've been developing a language called Prowl in the discord server. Strings can be concatenated into bigger strings, it turns out you can do the same with programs, and they are related - Prowl is a stack language that uses regex for control flow. It's also kind of a logic language, since regex semantics includes forms of backtracking. The patterns match data instead of strings, like in FP, and then the combinators decide the control flow from there. Eval has a type like Stack -> List Stack, then there are 3 basic operators "cat", "alt", and "intersect" (we use juxtaposition, |, and && as in regex, but it's also >>=, <|>, *> in Haskell) which put code together. While the language is still largely in the design phase, there is a prototype interpreter that is able to run most examples. If this interests you, check out the language tour.

Thank you. [It's very early in the works](https://github.com/UberPyro/prowl/), see [tutorial ](https://uberpyro.github.io/prowl/introduction.html) for more details.

Every application needs a payment service or a transaction interface to make payments while signing up for a subscription. Through HADWIN, one can learn various fundamentals and skills like design patterns and state management/nested state management with the Provider pattern. Also, how to fetch data from servers with restful API to connect the app to backend services.

I have been working on a prototype of a fund transfer app called HADWIN, actually completed and released version 1.0.0 ... i guess we can call it progress 😅 I have built it with Flutter... but scalability is an issue so this month I will probably be working on making it scalable with this server I have been building with python-flask other than that debugging most probably.

PayPal concept using Flutter