Explore creating robust HTTP services in Scala's functional programming paradigm. Gain insights into pure vs. impure implementations, their pros and cons, and effective tool usage.

scala-platform.tar.gz

Scala-Pure

Scala-Impure

Scala-Tapir

Scala-Impure-Test

Scala-Pure-Test

Scala-Tapir-Test

Test

Scala - Run Code Widget 

Scala-Pure-copy

Scala is one of the most popular general-purpose languages that supports both object-oriented and functional programming. In this course, you will learn how to create back-end HTTP services using Scala's functional programming paradigm.

You will also learn how to develop, test, and document the service using both pure and impure ways. You will be exposed to the differences between pure and impure implementation, their respective pros and cons, and how pure implementation can be more robust in terms of performance, understandability, testability, and type safeness. 

By the end of the course, you will have a clear idea of how functional programming works in Scala and how you can use the available tools more effectively.

Pure Functional HTTP APIs in Scala

# Migrations 

The database layer should provide programmatic access to the database and also manage changes in the database. The latter is called **migrations** or **evolutions**.  We will use **Flyway** as the tool to manage our database schema. 

>**Flyway** uses raw SQL scripts that have to be put into a certain location and follow certain naming conventions. This is the `/db/migration` (under the resources folder) in our case. The files also have to be named following the convention `VXX__some_name.sql`, where `XX` is the version number. Please note that there are two underscores between the version prefix and the rest of the name. 

Because our database schema is straightforward, we get done quickly.


 Learn how to set up the database layer for the impure service using Flyway.

Introduction

Impure Implementation

Pure Implementation

Testing Impure Services

Testing Pure Services

Benchmarks

Documentation

Epilogue

Setting Up the Database

Migrations