Handling Errors Correctly with Jeff Kelley

In this episode, Leo talks with Jeff Kelley from Detroit Labs about handing, tracking and test errors and when they can happen.

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What is special about errors in Swift 

  • The history of Objective-C and Swift errors
  • The strong-typed nature of Swift
  • fatalError vs assert vs precondition
  • How to test fatalError in unit tests

What are some ways to handle errors?

  • User initiated errors and dialogs
  • Chaining logging and error tracking
  • Differentiating release and debug build
  • Using proxy server to listen to requests in debug
  • When to purposely crash with fatalError
  • Dealing with asynchronous callbacks and Combine
  • What is the Never type?
  • Dealing with permission prompts like HealthKit

What can teams do to design and develop for errors

  • Use a service to track errors for developers
  • Showing the user the correct information
  • Dealing with issues which aren't errors
  • Designers should show how errors are handled
  • Design the write localized messages for errors
  • With agile development, make sure each error path is handled in your story card

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