Scala is one of the finest languages on JVM which help us in writing functional code. But can we further make our microservices more concurrent, less error-prone and generic/reusable?

In this session, we would be answering the above questions by visiting one of the most powerful functional libraries in Scala i.e Scala-Cats, which provides abstractions for functional programming and make things developer friendly and feature rich. The syntax and classes of Scala-Cats are similar to Haskell. Various libraries are built over Scala-Cats which aids us in building a purely functional microservices over JVM. In this talk, we would be building microservices using typelevel projects like http4s, circe, doobie and more which are based on Scala-Cats.

We would be demonstrating applications of various scala-cats libraries and perform basic CRUD operations using them. By using http4s we would be implementing synchronous, asynchronous and streaming rest endpoints, using doobie which is a pure functional JDBC layer for Scala etc.