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  • Book Overview & Buying Clojure Reactive Programming
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Clojure Reactive Programming

Clojure Reactive Programming

By : Leonardo Borges
4.3 (13)
Buy this Book
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Clojure Reactive Programming

Clojure Reactive Programming

4.3 (13)
By: Leonardo Borges
Buy this Book

Overview of this book

If you are a Clojure developer who is interested in using Reactive Programming to build asynchronous and concurrent applications, this book is for you. Knowledge of Clojure and Leiningen is required. Basic understanding of ClojureScript will be helpful for the web chapters, although it is not strictly necessary.
Table of Contents (13 chapters)
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Preface
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Preface
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What this book covers
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What you need for this book
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Who this book is for
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Conventions
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Reader feedback
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Customer support
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1
1. What is Reactive Programming?
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1. What is Reactive Programming?
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A taste of Reactive Programming
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A bit of history
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Signals and events
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Implementation challenges
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Applications of FRP
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Summary
2
2. A Look at Reactive Extensions
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2. A Look at Reactive Extensions
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The Observer pattern revisited
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Creating Observables
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Manipulating Observables
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Flatmap and friends
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Error handling
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Backpressure
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Summary
3
3. Asynchronous Programming and Networking
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3. Asynchronous Programming and Networking
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Building a stock market monitoring application
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Rolling averages
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Identifying problems with our current approach
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Removing incidental complexity with RxClojure
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Summary
4
4. Introduction to core.async
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4. Introduction to core.async
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Asynchronous programming and concurrency
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core.async
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Rewriting the stock market application with core.async
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Error handling
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Backpressure
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Transducers
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Summary
5
5. Creating Your Own CES Framework with core.async
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5. Creating Your Own CES Framework with core.async
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A minimal CES framework
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Exercises
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A respondent application
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CES versus core.async
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Summary
6
6. Building a Simple ClojureScript Game with Reagi
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6. Building a Simple ClojureScript Game with Reagi
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Setting up the project
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Reagi and other CES frameworks
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Summary
7
7. The UI as a Function
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7. The UI as a Function
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The problem with complex web UIs
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Enter React.js
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ClojureScript and Om
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Building a simple Contacts application with Om
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Intercomponent communication
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Exercises
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Summary
8
8. Futures
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8. Futures
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Clojure futures
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Fetching data in parallel
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Imminent – a composable futures library for Clojure
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The movies example revisited
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Futures and blocking IO
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Summary
9
9. A Reactive API to Amazon Web Services
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9. A Reactive API to Amazon Web Services
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The problem
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Infrastructure automation
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AWS resources dashboard
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CloudFormation
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EC2
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RDS
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Designing the solution
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Exercises
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Summary
10
A. The Algebra of Library Design
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A. The Algebra of Library Design
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The semantics of map
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Finding the average of ages
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Applicative Functors
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Gathering stats about ages
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Monads
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Summary
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B. Bibliography
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B. Bibliography
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Index
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Index

Chapter 6. Building a Simple ClojureScript Game with Reagi

In the previous chapter, we learned how a framework for Compositional Event Systems (CES) works by building our own framework, which we called respondent. It gave us a great insight into the main abstractions involved in such a piece of software as well as a good overview of core.async, Clojure's library for asynchronous programming and the foundation of our framework.

Respondent is but a toy framework, however. We paid little attention to cross-cutting concerns such as memory efficiency and exception handling. That is okay as we used it as a vehicle for learning more about handling and composing event systems with core.async. Additionally, its design is intentionally similar to Reagi's design.

In this chapter, we will:

  • Learn about Reagi, a CES framework built on top of core.async
  • Use Reagi to build the rudiments of a ClojureScript game that will teach us how to handle user input in a clean and maintainable way
  • Briefly...
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