Elements of Clojure
Elements of Clojure
About the Book
A print edition of this book can be purchased here.
This book tries to put words to what most experienced programmers already know. This is necessary because, in the words of Michael Polanyi, "we can know more than we can tell." Our design choices are not the result of an ineluctable chain of logic; they come from a deeper place, one which is visceral and inarticulate.
Polanyi calls this "tacit knowledge", a thing which we only understand as part of something else. When we speak, we do not focus on making sounds, we focus on our words. We understand the muscular act of speech, but would struggle to explain it.
To write software, we must learn where to draw boundaries. Good software is built through effective indirection. We seem to have decided that this skill can only be learned through practice; it cannot be taught, except by example. Our decisions may improve with time, but not our ability to explain them.
It's true that the study of these questions cannot yield a closed-form solution for judging software design. We can make our software simple, but we cannot do the same to its problem domain, its users, or the physical world. Our tacit knowledge of this environment will always inform our designs.
This doesn't mean that we can simply ignore our design process. Polanyi tells us that tacit knowledge only suffices until we fail, and the software industry is awash with failure. Our designs may never be provably correct, but we can give voice to the intuition that shaped them. Our process may always be visceral, but it doesn't have to be inarticulate.
And so this book does not offer knowledge, it offers clarity. It is aimed at readers who know Clojure, but struggle to articulate the rationale of their designs to themselves and others. Readers who use other languages, but have a passing familiarity with Clojure, may also find this book useful.
The first chapter, Names, explains why names define the structure of our software, and how to judge whether a name is any good.
The second chapter, Idioms, provides specific, syntactic advice for writing Clojure which is clean and readable.
The third chapter, Indirection, looks at how code can be made simpler and more robust through separation.
The final chapter, Composition, explores how the constituent pieces of our code can be combined into an effective whole.
If you'd like to discuss the book, visit the mailing list.
- Naming Data
- Naming Functions
- Naming Macros
When using inequalities, prefer
- If a function accumulates values, support every arity
- Use option maps, not named parameters
No one should have to know you’ve used
If you have mutable state, use an
doblock implies side effects
- Use the narrowest possible data accessor
letfnfor mutual recursion
- Java interop should be obvious
forto create cartesian products
nilshould be the absence of only a few values
- When using inequalities, prefer
- Method Dispatch
- What is an Abstraction?
- A Model for Modules
- Consequences of our Model
- Systems of Modules
- A Unit of Computation
- Building a Process
- Composing Processes
The Leanpub 45-day 100% Happiness Guarantee
Within 45 days of purchase you can get a 100% refund on any Leanpub purchase, in two clicks.
See full terms
Free Updates. DRM Free.
If you buy a Leanpub book, you get free updates for as long as the author updates the book! Many authors use Leanpub to publish their books in-progress, while they are writing them. All readers get free updates, regardless of when they bought the book or how much they paid (including free).
Most Leanpub books are available in PDF (for computers), EPUB (for phones and tablets) and MOBI (for Kindle). The formats that a book includes are shown at the top right corner of this page.
Finally, Leanpub books don't have any DRM copy-protection nonsense, so you can easily read them on any supported device.
C++ Best PracticesJason Turner
Level up your C++, get the tools working for you, eliminate common problems, and move on to more exciting things!
OpenIntro StatisticsDavid Diez, Christopher Barr, Mine Cetinkaya-Rundel, and OpenIntro
A complete foundation for Statistics, also serving as a foundation for Data Science.
Leanpub revenue supports OpenIntro (US-based nonprofit) so we can provide free desk copies to teachers interested in using OpenIntro Statistics in the classroom and expand the project to support free textbooks in other subjects.
More resources: openintro.org.
Functional Design and ArchitectureAlexander Granin
Software Design in Functional Programming, Design Patterns and Practices, Methodologies and Application Architectures. How to build real software in Haskell with less efforts and low risks. The first complete source of knowledge.
C++20 is the next big C++ standard after C++11. As C++11 did it, C++20 changes the way we program modern C++. This change is, in particular, due to the big four of C++20: ranges, coroutines, concepts, and modules.
The book is almost daily updated. These incremental updates ease my interaction with the proofreaders.
Atomic KotlinBruce Eckel and Svetlana Isakova
For both beginning and experienced programmers! From the author of the multi-award-winning Thinking in C++ and Thinking in Java together with a member of the Kotlin language team comes a book that breaks the concepts into small, easy-to-digest "atoms," along with exercises supported by hints and solutions directly inside IntelliJ IDEA!
Introductory Statistics with Randomization and SimulationMine Cetinkaya-Rundel, Christopher Barr, OpenIntro, and David Diez
A complete foundation for Statistics, also serving as a foundation for Data Science, that introduces inference using randomization and simulation while covering traditional methods.
Leanpub revenue supports OpenIntro, so we can provide free desk copies to teachers interested in using our books in the classroom.
More resources: openintro.org.
Java OOP Done RightAlan Mellor
Object Oriented Programming is still a great way to create clean, maintainable code. But only if you use it right.
This book gives you 25 years of OO best practice, ready to use.
You'll learn to design objects behaviour-first, use TDD to help, then confidently apply Design Patterns, SOLID principles and Refactoring to make clean, crafted code.
R Programming for Data ScienceRoger D. Peng
This book brings the fundamentals of R programming to you, using the same material developed as part of the industry-leading Johns Hopkins Data Science Specialization. The skills taught in this book will lay the foundation for you to begin your journey learning data science. Printed copies of this book are available through Lulu.
Ansible for DevOpsJeff Geerling
Ansible is a simple, but powerful, server and configuration management tool. Learn to use Ansible effectively, whether you manage one server—or thousands.
Composing SoftwareEric Elliott
All software design is composition: the act of breaking complex problems down into smaller problems and composing those solutions. Most developers have a limited understanding of compositional techniques. It's time for that to change.
Software Architecture for Developers: Volumes 1 & 2 - Technical leadership and communication
2 Books"Software Architecture for Developers" is a practical and pragmatic guide to modern, lightweight software architecture, specifically aimed at developers. You'll learn:The essence of software architecture.Why the software architecture role should include coding, coaching and collaboration.The things that you really need to think about before...
CCIE Service Provider Ultimate Study Bundle
2 BooksPiotr Jablonski, Lukasz Bromirski, and Nick Russo have joined forces to deliver the only CCIE Service Provider training resource you'll ever need. This bundle contains a detailed and challenging collection of workbook labs, plus an extensively detailed technical reference guide. All of us have earned the CCIE Service Provider certification...
Cisco CCNA 200-301 Complet
4 BooksCe lot comprend les quatre volumes du guide préparation à l'examen de certification Cisco CCNA 200-301.
CCDE Practical Studies (All labs)
3 BooksCCDE lab
Modern Management Made Easy
3 BooksRead all three Modern Management Made Easy books. Learn to manage yourself, lead and serve others, and lead the organization.
The Future of Digital Health
6 BooksWe put together the most popular books from The Medical Futurist to provide a clear picture about the major trends shaping the future of medicine and healthcare. Digital health technologies, artificial intelligence, the future of 20 medical specialties, big pharma, data privacy and how technology giants such as Amazon or Google want to conquer...
Django for Beginners/APIs/Professionals
Linux Administration Complet
4 BooksCe lot comprend les quatre volumes du Guide Linux Administration :Linux Administration, Volume 1, Administration fondamentale : Guide pratique de préparation aux examens de certification LPIC 1, Linux Essentials, RHCSA et LFCS. Administration fondamentale. Introduction à Linux. Le Shell. Traitement du texte. Arborescence de fichiers. Sécurité...
Advanced Product Management
3 BooksGet The Art of Strategy, Product Discovery and Lean Product Management with a 20% discount.
C++17 in Detail and Lambda Story
2 BooksGet all of my books much cheaper! With this package, you'll learn the exciting things available in C++17 and also understand lambda expressions.