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Pure Functional HTTP APIs in Scala
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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.

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Overview

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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.

Scala is one of the most popular general-purpose languages that supports both object-oriented and functional programming. In thi...Show More

WHAT YOU'LL LEARN

Develop, test, and document the back-end HTTP services using functional programming paradigm.

Learn the pros and cons of Pure and Impure functional programming techniques.

By the end, you will have a firm hold of functional programming in Scala.

Develop, test, and document the back-end HTTP services using functional programming paradigm.

Content

53 Lessons3 Quizzes

Introduction

5 Lessons

Get familiar with building and managing functional, pure, and impure Scala backend services.

What is This Course About?

Service Specification and APIs

The State of the Art

An Alternate Way

Quiz on Functional Programming in Scala

Impure Implementation

9 Lessons

Discover the logic behind building Scala-based HTTP APIs with Akka-HTTP, Slick, and PostgreSQL.

Getting Started

Models

Setting Up the Database

Slick Tables

Functions for Data Access

Akka-HTTP Routes

Some More Routes

Interact with the Service

Quiz on Impure Service Implementation

Pure Implementation

11 Lessons

Work your way through building pure functional HTTP APIs in Scala using libraries and techniques.

Getting Started

Pure Configuration Handling

Models

Database

Doobie

Functions for Data Access

Http4s Routes

Streaming

JSON Trouble

Starting the Application

Quiz on Pure Service Implementation

Testing Impure Services

11 Lessons

Enhance your skills in testing Scala's HTTP APIs with unit, integration tests, and ScalaCheck.

Setting Up Integration Tests

Testing the Repository

Testing the Routes: Setup

Testing the Routes: Use Case - Loading

Testing the Routes: Use Case - Saving

Testing the Routes: Use Case - Updating

Carrying Out Tests

Testing Pure Services

7 Lessons

Map out the steps for unit and integration tests of Scala HTTP API services.

Setting Up Unit Tests

Unit Tests for Product Routes Part 1

Unit Tests for Product Routes Part 2

Unit Tests for Products Routes Part 3

Integration Tests Setup

Integration Tests

Carrying Out Tests

Benchmarks

2 Lessons

Tackle performance advantages of pure functional implementations in handling requests and updates.

Adding Benchmarks - Part I

Adding Benchmarks - Part II

Documentation

7 Lessons

Master the steps to document APIs effectively using Scala, Tapir, and OpenAPI.

Documenting Our API

A Pure Implementation Using Tapir

Product Routes - Load and Update Product

Products Routes - Create and Load all Products

Documentation via OpenAPI

Refining the Generated Documentation: Part-I

Refining the Generated Documentation: Part-II

Epilogue

1 Lessons

Get familiar with pure functional programming benefits, testability, and future opportunities.

Overview and the Way Forward

Certificate of Completion

Showcase your accomplishment by sharing your certificate of completion.

Course Author:

Jens Grassel

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