Parsing JSON in Swift + Bonuses (The Book + Bonuses)
Parsing JSON in Swift + Bonuses
About the Book
Parsing JSON in Swift will teach you to harness the power of Swift and give you confidence that your app can gracefully handle any JSON that comes its way.
This edition includes two bonuses as part of The REST & JSON in Swift Bundle: The 5-Part Guide to Getting Started with Swift + The transcript from our Live Q&A about REST & JSON in Swift.
You'll learn:
- How to use NSJSONSerialization to transform JSON into Swift types, and why you should avoid using AnyObject whenever you can
- The dangers of forced type casting and how to avoid them
- Simple strategies you can use to make your JSON deserialization more concise, readable, and elegant
- Whether to return nil, empty, or throw an error when transforming JSON into an array of model objects
- How to write unit tests to increase your confidence in your parser's correctness
You'll go from fighting an uphill battle against an uncooperative compiler to having a JSON parser that's proven to be stable with automated tests.
About the Author
Table of Contents
Convert JSON into Swift types with NSJSONSerialization
- Deserializing JSON into Swift types
- The dangers of forced type casting
- Where should all this JSON code go?
- Handling errors with do-try-catch
Increase your confidence with automated tests
- Why test?
- Creating a JSON test file
- Creating a JSON test case
- Dealing with test failures
- Increasing confidence with test coverage
- Enabling and viewing test coverage reports in Xcode
- Avoiding false confidence with strong assertions
- Testing the error path
- Finding the point of diminishing returns
Achieve conciseness, readability, and elegance with these simple principles
- Reducing clutter with proper typing
- Increasing clarity and readability with typealias
- Deconstructing the pyramid of doom
Transform Swift types into model objects for convenience and stability
- Why model objects?
- Testing with model objects
- Creating a model object
- Transforming dictionaries into model objects
- Producing specific error messages to clarify where parsing failed
- Handling arrays and nil
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