An applicative functor for data processing pipelines, using go1.18 generics.
The applicative package is primarily an exploration of golang generics (parametric polymorphism) introduced in the Go 1.18 release.
An applicative functor is a mathematical concept and functional programming pattern. In engineering, it often helps to have formal, mathematical descriptions of problem domain. Making use of these formalism to have an organized/structured approach is very different from considering all programming as mathematics.
We are interested here in the particular domain of stream processing, or data processing pipelines. This domain is one born from practical application and does not have "standard" formal descriptions. The purpose of this library is not to capture applicative functors as a programming abstraction, but rather to explore its usefulness in structuring this problem domain.
To get started, check out example/wordcount/wordcount.go
It contains a simple data processing pipeline.
You can run it in "demo" mode:
>go build example/wordcount/wordcount.go
>wordcount
It will perform a "static analysis" on the pipeline. Then it will run the pipeline on some sample data.
Or you can run it in "server" mode:
>wordcount -mode=server
This will run a HTTP server at localhost:8080.
Call it in a separate tab:
curl localhost:8080/in -H "process: wordcount" --data "hello world"
curl localhost:8080/out -H "process: wordcount"