Video

12/2019 - FPinBO at LuogoComune (BO)

Abstract

The Functional Programming paradigm has largely been emphasized in academia rather than commercial or industrial settings. However, languages that support functional programming may show their best when used to actually deliver value to the business.

In this talk, You will see how a bunch of datatypes and techniques can help in implementing a pretty common business case and You will then discover how there's no need to be a mathematician in order to be a functional programmer.

How to run

• To bring up mongo and rabbit: docker-compose up -d
• Export these env var:

export MONGO_USERNAME=root
export MONGO_PASSWORD=example
export RABBIT_USERNAME=guest
export RABBIT_PASSWORD=guest

• run both applications: sbt "runMain api.OrderHistoryApp" and sbt "runMain projector.OrderHistoryProjectorApp"
• now you can create the queue and push any message, e.g.

{
  "id": "001",
  "company": "ACME",
  "email": "asdf@asdf.com",
  "lines": [
    {
      "no": 1,
      "item": "jeans",
      "price": 100
    }
  ]
}

• and query the api

How to run tests

sbt test