Book Image

Mastering Clojure

By : Akhil Wali
Book Image

Mastering Clojure

By: Akhil Wali

Overview of this book

Clojure is a general-purpose language from the Lisp family with an emphasis on functional programming. It has some interesting concepts and features such as immutability, gradual typing, thread-safe concurrency primitives, and macro-based metaprogramming, which makes it a great choice to create modern, performant, and scalable applications. Mastering Clojure gives you an insight into the nitty-gritty details and more advanced features of the Clojure programming language to create more scalable, maintainable, and elegant applications. You’ll start off by learning the details of sequences, concurrency primitives, and macros. Packed with a lot of examples, you’ll get a walkthrough on orchestrating concurrency and parallelism, which will help you understand Clojure reducers, and we’ll walk through composing transducers so you know about functional composition and process transformation inside out. We also explain how reducers and transducers can be used to handle data in a more performant manner. Later on, we describe how Clojure also supports other programming paradigms such as pure functional programming and logic programming. Furthermore, you’ll level up your skills by taking advantage of Clojure's powerful macro system. Parallel, asynchronous, and reactive programming techniques are also described in detail. Lastly, we’ll show you how to test and troubleshoot your code to speed up your development cycles and allow you to deploy the code faster.
Table of Contents (19 chapters)
Mastering Clojure
Credits
About the Author
About the Reviewer
www.PacktPub.com
Preface
References
Index

Introducing Om


The Om library (https://github.com/omcljs/om) is a great tool for building dynamic user interfaces in ClojureScript. In fact, it's an interface to React.js (http://facebook.github.io/react/), which is a JavaScript library for creating interactive user interface components. Om lets us define a user interface as a hierarchy of components, and each component reactively modifies its appearance based on changes to the component's state. In this way, Om components react to changes in their state.

Note

The following library dependencies are required for the upcoming examples:

[org.omcljs/om "0.8.8"]

Also, the following namespaces must be included in your namespace declaration:

(ns my-namespace
  (:require [om.core :as om :include-macros true]
            [om.dom :as dom :include-macros true]))

In addition to the preceding dependencies, the following examples also use the by-id function from src/m_clj/c9/common.cljs. Ensure that the code in the following ClojureScript examples is compiled...