Book Image

The Clojure Workshop

By : Joseph Fahey, Thomas Haratyk, Scott McCaughie, Yehonathan Sharvit, Konrad Szydlo
Book Image

The Clojure Workshop

By: Joseph Fahey, Thomas Haratyk, Scott McCaughie, Yehonathan Sharvit, Konrad Szydlo

Overview of this book

The Clojure Workshop is a step-by-step guide to Clojure and ClojureScript, designed to quickly get you up and running as a confident, knowledgeable developer. Because of the functional nature of the language, Clojure programming is quite different to what many developers will have experienced. As hosted languages, Clojure and ClojureScript can also be daunting for newcomers because of complexities in the tooling and the challenge of interacting with the host platforms. To help you overcome these barriers, this book adopts a practical approach. Every chapter is centered around building something. As you progress through the book, you will progressively develop the 'muscle memory' that will make you a productive Clojure programmer, and help you see the world through the concepts of functional programming. You will also gain familiarity with common idioms and patterns, as well as exposure to some of the most widely used libraries. Unlike many Clojure books, this Workshop will include significant coverage of both Clojure and ClojureScript. This makes it useful no matter your goal or preferred platform, and provides a fresh perspective on the hosted nature of the language. By the end of this book, you'll have the knowledge, skills and confidence to creatively tackle your own ambitious projects with Clojure and ClojureScript.
Table of Contents (17 chapters)
Free Chapter
2
2. Data Types and Immutability

Summary

This chapter gave us an introduction to the Apache Derby RDBMS, creating a locally hosted instance with minimal setup. We then explored data models and how to codify them into a schema using DDL. We used clojure.java.jdbc to load this schema before investigating how the API allows us to perform CRUD operations, spending time on how to control the results from our query executions.

We then built an application layer for our ELO calculation application. In doing so, we learned which functions to expose as part of our API and which are internal to our application and should be kept private from a user.

In the next chapter, we'll take the public API of our application layer and learn how to build a REST-based web service to expose that API over HTTP. In this way, we can make calls from a REST client and interact with our application over a network, rather than via a locally hosted REPL.

Subsequently, we'll improve this RESTful interaction by adding a higher-level...