Clojure for Java Developers by Díaz, Eduardo -- Read -- Imperial Library of Trantor

Index

Clojure for Java Developers

Table of Contents Clojure for Java Developers Credits About the Author About the Reviewer www.PacktPub.com

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Preface

What this book covers What you need for this book Who this book is for Conventions Reader feedback Customer support

Downloading the example code Downloading the color images of this book Piracy Questions

1. Getting Started with Clojure

Getting to know Clojure Installing Leiningen Using a REPL

The nREPL protocol Hello world REPL utilities and conventions

Creating a new project

Project structure Creating a standalone app

Using Cursive Clojure

Installing Cursive Clojure

Getting started with Clojure code and data

Lists in Clojure Operations in Clojure Functions in Clojure

Clojure's data types

Scalars Collection data types

Summary

2. Namespaces, Packages, and Tests

Namespaces in Clojure

Packages in Clojure

The classpath and the classloader

Back to Clojure namespaces

Playing with namespaces

Creating a new namespace Working with namespaces on the REPL

Testing in Clojure

Testing from the command line Testing in IntelliJ

Summary

3. Interacting with Java

Using Maven dependencies Clojure interop syntax

Creating an object Calling an instance method Calling a static method or function Accessing inner classes

Writing a simple image namespace Writing the tests

The let statement

Destructuring in Clojure

Sequential destructuring Associative destructuring

Exposing your code to Java

Testing from Groovy

Proxy and reify Summary

4. Collections and Functional Programming

Basics of functional programming Persistent collections Types of collections in Clojure The sequence abstraction Specific collection types in Clojure

Vectors Lists Maps

Sorted maps and hash maps Common properties

Sets

Sorted sets and hash sets Common properties Union, difference, and intersection

Applying functional programming to collections

The imperative programming model The functional paradigm Functional programming and immutability Laziness

Summary

5. Multimethods and Protocols

Polymorphism in Java Multimethods in Clojure

Keyword hierarchies

isa? parents descendants underive

A la carte dispatch functions

Protocols in Clojure

Records in Clojure

Summary

6. Concurrency

Using your Java knowledge The Clojure model of state and identity Promises

Pulsar and lightweight threads

Futures Software transactional memory and refs Atoms Agents

Validators Watchers

core.async

Why lightweight threads? Goblocks Channels Transducers

Summary

7. Macros in Clojure

Lisp's foundational ideas Macros as code modification tools

Modifying code in Java Modifying code in Groovy

The @ToString annotation The @TupleConstructor annotation The @Slf4j annotation

Writing your first macro Debugging your first macro

Quote, syntax quote, and unquoting Unquote splicing gensym

Macros in the real world References Summary

Index

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