Book Image

Clojure Programming Cookbook

Book Image

Clojure Programming Cookbook

Overview of this book

When it comes to learning and using a new language you need an effective guide to be by your side when things get rough. For Clojure developers, these recipes have everything you need to take on everything this language offers. This book is divided into three high impact sections. The first section gives you an introduction to live programming and best practices. We show you how to interact with your connections by manipulating, transforming, and merging collections. You’ll learn how to work with macros, protocols, multi-methods, and transducers. We’ll also teach you how to work with languages such as Java, and Scala. The next section deals with intermediate-level content and enhances your Clojure skills, here we’ll teach you concurrency programming with Clojure for high performance. We will provide you with advanced best practices, tips on Clojure programming, and show you how to work with Clojure while developing applications. In the final section you will learn how to test, deploy and analyze websocket behavior when your app is deployed in the cloud. Finally, we will take you through DevOps. Developing with Clojure has never been easier with these recipes by your side!
Table of Contents (16 chapters)
Clojure Programming Cookbook
About the Authors
About the Reviewer

Using Reader Conditionals, compile to Clojure, and ClojureScript

Codes in Clojure and ClojureScript are almost the same but there are few differences. For instance, libraries provided by Java and JavaScript are quite different. Host environments between JVM and JavaScript runtimes are also different.

Before the version 1.7, we use the cljx plugin to keep compatibility between them. However, it requires a tooling and the style is not clean.

For such a situation, Clojure 1.7 introduced Reader Conditionals are introduced. Reader Conditionals have richer semantics than cljx, such as default expressions and form splicing and no prepossessing.

Using Reader Conditionals, we can share source code among Clojure, ClojureScript, and ClojureCLR. In this recipe, we will demonstrate how we can share single source files between Clojure and ClojureScript.

Getting ready

We will use the Figwheel template to generate a Clojure and ClojureScript project:

$ lein new figwheel cljc-example -- --om 

The generated...