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

Leiningen Profiles

Profiles are a Leiningen tool that allows us to change the configuration of our projects. A profile is a specification that influences how a project behaves. For example, during development or testing, say that we would like to include testing frameworks in our builds but the production build does not need testing dependencies. Using profiles is a great way to separate different development setups that should be run against one code base.

Leiningen allows us to define profiles in a few places depending on our needs:

  • In the project.clj file
  • In the profiles.clj file
  • In the ~/.lein/profiles.clj file

Leiningen profiles defined in project.clj are specific to that particular project. Such profiles will not affect other projects. This allows separation between projects and the ability to customize them independently. We could have one application that uses the newest version of Clojure and requires different libraries to another application relying...