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Reactive Programming with Swift 4

You're reading from   Reactive Programming with Swift 4 Build asynchronous reactive applications with easy-to-maintain and clean code using RxSwift and Xcode 9

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Product type Paperback
Published in Feb 2018
Publisher Packt
ISBN-13 9781787120211
Length 320 pages
Edition 1st Edition
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Author (1):
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Navdeep Singh Navdeep Singh
Author Profile Icon Navdeep Singh
Navdeep Singh
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Toc

Table of Contents (15) Chapters Close

Preface 1. Migrating from Swift 3 to Swift 4 2. FRP Fundamentals, Terminology, and Basic Building Blocks FREE CHAPTER 3. Set up RxSwift and Convert a Basic Login App to its RxSwift Counterpart 4. When to Become Reactive? 5. Filter, Transform, and Simplify 6. Reduce by Combining and Filtering and Common Trade Offs 7. React to UI Events – Start Subscribing 8. RxTest and Custom Rx Extensions – Testing with Rx 9. Testing Your RxCode – Testing Asynchronous Code 10. Schedule Your Tasks, Don't Queue! 11. Subscribe to Errors and Save Your App 12. Functional and Reactive App-Architecture 13. Finish a Real-World Application 14. Other Books You May Enjoy

Error handling

We will start this section with the starter project for this chapter and dive straight into code as you already are well aware of how to set up the RxSwift workspace and how to create one from scratch if need be. For the time being, open the starter project, and you will see that we have already created a SupportCode file in which we have declared an enum called CustomError, as follows:

public enum CustomError: Error {
case test
}

Just to verify that we are on the same page, check the following screenshot and ensure that you have a similar project structure:

We will start with the catchErrorJustReturn operator on the playground page.

The catchErrorJustReturn operator

The catchErrorJustReturn operator recovers...

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