Search icon CANCEL
Subscription
0
Cart icon
Your Cart (0 item)
Close icon
You have no products in your basket yet
Save more on your purchases now! discount-offer-chevron-icon
Savings automatically calculated. No voucher code required.
Arrow left icon
Explore Products
Best Sellers
New Releases
Books
Videos
Audiobooks
Learning Hub
Conferences
Free Learning
Arrow right icon
Arrow up icon
GO TO TOP
The Clojure Workshop

You're reading from   The Clojure Workshop Use functional programming to build data-centric applications with Clojure and ClojureScript

Arrow left icon
Product type Paperback
Published in Jan 2020
Publisher Packt
ISBN-13 9781838825485
Length 800 pages
Edition 1st Edition
Languages
Arrow right icon
Authors (5):
Arrow left icon
Konrad Szydlo Konrad Szydlo
Author Profile Icon Konrad Szydlo
Konrad Szydlo
Yehonathan Sharvit Yehonathan Sharvit
Author Profile Icon Yehonathan Sharvit
Yehonathan Sharvit
Scott McCaughie Scott McCaughie
Author Profile Icon Scott McCaughie
Scott McCaughie
Thomas Haratyk Thomas Haratyk
Author Profile Icon Thomas Haratyk
Thomas Haratyk
Joseph Fahey Joseph Fahey
Author Profile Icon Joseph Fahey
Joseph Fahey
+1 more Show less
Arrow right icon
View More author details
Toc

Table of Contents (17) Chapters Close

Preface 1. Hello REPL! 2. Data Types and Immutability FREE CHAPTER 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

Introduction to Elo

In the rest of this chapter, and in some of the following chapters, we are going to be working with the Elo Rating System to develop player ratings and predict match outcomes. The algorithm itself is quite simple and it will allow us to demonstrate how Clojure can be used as a data analysis tool. Since we'll be referring to it a lot, it's worth taking a closer look at how it works. The Elo Rating System was developed by Arpad Elo to rate chess players. The United States Chess Federation began using it in 1960.

Elo ratings work by establishing a score for each player. This score is used to calculate the probable outcome of a match. When the real outcome of the match is known, a player's rating is raised or lowered depending on their performance relative to the probable outcome. In other words, if a beginner with a low rating loses to a higher-rated player, the beginner's rating will not suffer by much, since that outcome was expected. If they...

lock icon The rest of the chapter is locked
Register for a free Packt account to unlock a world of extra content!
A free Packt account unlocks extra newsletters, articles, discounted offers, and much more. Start advancing your knowledge today.
Unlock this book and the full library FREE for 7 days
Get unlimited access to 7000+ expert-authored eBooks and videos courses covering every tech area you can think of
Renews at $19.99/month. Cancel anytime