Functional Reactive Programming by Stephen Blackheath, Anthony Jones

By Stephen Blackheath, Anthony Jones

Summary

Functional Reactive Programming teaches the suggestions and functions of FRP. It deals a cautious walk-through of center FRP operations and introduces the ideas and methods you will need to take advantage of FRP in any language.

Purchase of the print ebook encompasses a unfastened book in PDF, Kindle, and ePub codecs from Manning Publications.

About the Technology

Today's software program is moving to extra asynchronous, event-based ideas. for many years, the Observer development has been the go-to occasion infrastructure, however it is understood to be bug-prone. practical reactive programming (FRP) replaces Observer, notably enhancing the standard of event-based code.

About the Book

Functional Reactive Programming teaches you ways FRP works and the way to exploit it. you are going to commence by means of gaining an figuring out of what FRP is and why it is so strong. Then, you are going to paintings via greenfield and legacy code as you learn how to practice FRP to sensible use instances. you will discover examples during this e-book from many program domain names utilizing either Java and JavaScript. if you find yourself comprehensive, you can actually use the FRP strategy within the structures you construct and spend much less time solving difficulties.

What's Inside

  • Think another way approximately facts and events
  • FRP ideas for Java and JavaScript
  • Eliminate Observer one listener at a time
  • Explore Sodium, RxJS, and Kefir.js FRP systems

About the Reader

Readers want intermediate Java or JavaScript talents. No event with practical programming or FRP required.

About the Authors

Stephen Blackheath and Anthony Jones are skilled software program builders and the creators of the Sodium FRP library for a number of languages. Foreword by way of Heinrich Apfelmus. Illustrated by means of Duncan Hill.

Table of Contents

  1. Stop listening!
  2. Core FRP
  3. Some daily widget stuff
  4. Writing a true program
  5. New options
  6. FRP on the net
  7. Switch
  8. Operational primitives
  9. Continuous time
  10. Battle of the paradigms
  11. Programming within the genuine international
  12. Helpers and styles
  13. Refactoring
  14. Adding FRP to current initiatives
  15. Future directions

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Extra resources for Functional Reactive Programming

Sample text

What goes on when this code runs? 11. We’re showing these in a style more akin to unified modeling language (UML), where each box represents a Java object in memory with a list of listeners that are currently registered. ) method. 11 Behind the scenes, the FRP system translates FRP statements into a directed graph of listeners. During the running stage, nothing happens until the user changes the departure or return date. date notifies its listeners of the change. ) method for valid is called, and the logic for the business rule is recalculated with the latest values.

The way streams and cells act is clearly defined. The primitives maintain that definition, no matter how they’re combined. The denotational semantics for an FRP system are the mathematical proof of this. This is how FRP guarantees the property of compositionality that gives so many advantages. We’ll explain the idea of compositionality in chapter 5. DEFINITION Compositionality—The property that the meaning of an expression is determined by the meanings of its parts and the rules used to combine them.

We assume the existence of a JDateField widget, which doesn’t exist in reality. Notice that there are certain places where the order of statements is critical—things will break if it isn’t right. setEnabled(valid); } } Threads allow you to express sequence; events allow you to express dependency. In different situations, both are needed. A lot of problems come from trying to express dependency with threads, or sequences with events. 8. All we need to Thinking declaratively: what the program is, not what it does 17 do is remove the unnecessary bits and reverse the data-flow arrows to turn them into a “depends on” relationship.

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