Reactive Programming with RxJS

Contents

Acknowledgments . . . . . . . . . . . ix

Preface . . . . . . . . . . . . . . xi

1. The Reactive Way . . . . . . . . . . . . 1

What’s Reactive? 1

Of Observers and Iterators 6

The Rx Pattern and the Observable 9

Creating Observables 10

Wrapping Up 15

2. Deep in the Sequence . . . . . . . . . . 17

Visualizing Observables 17

Basic Sequence Operators 19

Canceling Sequences 24

Handling Errors 26

Making a Real-Time Earthquake Visualizer 29

Ideas for Improvements 36

Operator Rundown 36

Wrapping Up 38

3. Building Concurrent Programs . . . . . . . . 39

Purity and the Observable Pipeline 39

RxJS’s Subject Class 45

Spaceship Reactive! 50

Ideas for Improvements 68

Wrapping Up 68

4. Building a Complete Web Application . . . . . . 69

Building a Real-Time Earthquake Dashboard 69

Adding a List of Earthquakes 71

Getting Real-Time Updates from Twitter 82

Ideas for Improvements 88

Wrapping Up 88

5. Bending Time with Schedulers . . . . . . . . 89

Using Schedulers 89

Scheduling for Animations 95

Testing with Schedulers 97

Wrapping Up 101

6. Reactive Web Applications with Cycle.js . . . . . 103

Cycle.js 103

Installing Cycle.js 104

Our Project: Wikipedia Search 105

Model-View-Intent 112

Creating Reusable Widgets 115

Ideas for Improvements 118

Wrapping Up 118

Index . . . . . . . . . . . . . . 119