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The Clojure Workshop

You're reading from  The Clojure Workshop

Product type Book
Published in Jan 2020
Publisher Packt
ISBN-13 9781838825485
Pages 800 pages
Edition 1st Edition
Languages
Concepts
Authors (5):
Joseph Fahey Joseph Fahey
Profile icon Joseph Fahey
LinkedIn
Joseph Fahey has been a developer for nearly two decades. He got his start in the Digital Humanities in the early 2000s. Ever since then, he has been trying to hone his skills and expand his inventory of techniques. This lead him to Common Lisp and then to Clojure when it was first introduced. As an independent developer, Joseph was able to quickly start using Clojure professionally. These days, Joseph gets to write Clojure for his day job at Empear AB.
See other products by Joseph Fahey
Thomas Haratyk Thomas Haratyk
Profile icon Thomas Haratyk
LinkedIn
Thomas Haratyk graduated from Lille University of Science and Technology and has been a professional programmer for nine years. After studying computer science and starting his career in France, he is now working as a consultant in London, helping start-ups develop their products and scale their platforms with Clojure, Ruby, and modern JavaScript.
See other products by Thomas Haratyk
Scott McCaughie Scott McCaughie
Profile icon Scott McCaughie
LinkedIn
Scott McCaughie lives near Glasgow, Scotland where he works as a senior Clojure developer for Previse, a Fintech startup aiming to solve the problem of slow payments in the B2B space. Having graduated from Heriot-Watt University, his first 6 years were spent building out Risk and PnL systems for JP Morgan. A fortuitous offer of a role learning and writing Clojure came up and he jumped at the chance. 5 years of coding later and it's the best career decision he's made. In his spare time, Scott is an avid reader, enjoys behavioral psychology and financial independence podcasts, and keeps fit by commuting by bike, running, climbing, hill walking, snowboarding. You get the picture!
See other products by Scott McCaughie
Yehonathan Sharvit Yehonathan Sharvit
Profile icon Yehonathan Sharvit
LinkedIn
Yehonathan Sharvit has been a software developer since 2001. He discovered functional programming in 2009. It has profoundly changed his view of programming and his coding style. He loves to share his discoveries and his expertise. He has been giving courses on Clojure and JavaScript since 2016. He holds a master's degree in Mathematics.
See other products by Yehonathan Sharvit
Konrad Szydlo Konrad Szydlo
Profile icon Konrad Szydlo
LinkedIn
Konrad Szydlo is a psychology and computing graduate from Bournemouth University. He has worked with Clojure for the last 8 years. Since January 2016, he has worked as a software engineer and team leader at Retailic, responsible for building a website for the biggest royalty program in Poland. Prior to this, he worked as a developer with Sky, developing e-commerce and sports applications, where he used Ruby, Java, and PHP. He is also listed in the Top 75 Datomic developers on GitHub.
See other products by Konrad Szydlo
View More author details

Table of Contents (17) Chapters

Preface 1. Hello REPL! 2. Data Types and Immutability 3. Functions in Depth 4. Mapping and Filtering 5. Many to One: Reducing 6. Recursion and Looping 7. Recursion II: Lazy Sequences 8. Namespaces, Libraries and Leiningen 9. Host Platform Interoperability with Java and JavaScript 10. Testing 11. Macros 12. Concurrency 13. Database Interaction and the Application Layer 14. HTTP with Ring 15. The Frontend: A ClojureScript UI Appendix

Working with External Libraries

Libraries are packaged programs that are ready to be used in other projects. External libraries are libraries that come from other developers. In Clojure, examples of such libraries include Ring, an HTTP library; clojure.java-time, a library for time and date manipulation; and hiccup, a library for writing HTML code using Clojure-style syntax.

Most projects will require developers to use existing code packaged as libraries. This is a good thing. We do not want to write code over and over again if the problem at hand has been already solved and someone has created a library for it that we can use.

In this section, we will use the clojure.Java-time library to display the current time.

Exercise 8.11: Using an External Library in a Leiningen Project

The aim of this exercise is to show you how to add a library to a Leiningen project and demonstrate how this library is used in code:

  1. The first thing to do is add a dependency to the time...
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Authors (5)

Left arrow icon
Profile icon Joseph Fahey
LinkedIn
Joseph Fahey has been a developer for nearly two decades. He got his start in the Digital Humanities in the early 2000s. Ever since then, he has been trying to hone his skills and expand his inventory of techniques. This lead him to Common Lisp and then to Clojure when it was first introduced. As an independent developer, Joseph was able to quickly start using Clojure professionally. These days, Joseph gets to write Clojure for his day job at Empear AB.
See other products by Joseph Fahey
Profile icon Thomas Haratyk
LinkedIn
Thomas Haratyk graduated from Lille University of Science and Technology and has been a professional programmer for nine years. After studying computer science and starting his career in France, he is now working as a consultant in London, helping start-ups develop their products and scale their platforms with Clojure, Ruby, and modern JavaScript.
See other products by Thomas Haratyk
Profile icon Scott McCaughie
LinkedIn
Scott McCaughie lives near Glasgow, Scotland where he works as a senior Clojure developer for Previse, a Fintech startup aiming to solve the problem of slow payments in the B2B space. Having graduated from Heriot-Watt University, his first 6 years were spent building out Risk and PnL systems for JP Morgan. A fortuitous offer of a role learning and writing Clojure came up and he jumped at the chance. 5 years of coding later and it's the best career decision he's made. In his spare time, Scott is an avid reader, enjoys behavioral psychology and financial independence podcasts, and keeps fit by commuting by bike, running, climbing, hill walking, snowboarding. You get the picture!
Read more
See other products by Scott McCaughie
Profile icon Yehonathan Sharvit
LinkedIn
Yehonathan Sharvit has been a software developer since 2001. He discovered functional programming in 2009. It has profoundly changed his view of programming and his coding style. He loves to share his discoveries and his expertise. He has been giving courses on Clojure and JavaScript since 2016. He holds a master's degree in Mathematics.
See other products by Yehonathan Sharvit
Profile icon Konrad Szydlo
LinkedIn
Konrad Szydlo is a psychology and computing graduate from Bournemouth University. He has worked with Clojure for the last 8 years. Since January 2016, he has worked as a software engineer and team leader at Retailic, responsible for building a website for the biggest royalty program in Poland. Prior to this, he worked as a developer with Sky, developing e-commerce and sports applications, where he used Ruby, Java, and PHP. He is also listed in the Top 75 Datomic developers on GitHub.
See other products by Konrad Szydlo
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