Module 3 of 3 in Advanced Swift Techniques

Advanced Error Handling & Result Types

Sep 5 2025, Swift 5.9, iOS 18, Xcode 16.4
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Production code is all about handling errors: programming errors, user input errors, asynchronous errors. In this course, you’ll review basic error handling with optionals and throw-catch, then learn how typed throws can help the compiler help you. The Result type encapsulates values and errors: Learn when Result types can be useful, for example, when you need to retain operation values. By Audrey Tam.

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EXPERIENCE
Advanced level
EST TIME TO COMPLETE
31 mins
CONTENT
3 lessons
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Module outcomes

  • Review basic error handling with optionals and throw-catch.
  • Learn how typed throws can help the compiler help you.
  • Learn when Result types can be useful, for example, when you need to retain operation values.

Covered concepts

  • try, try? and try!
  • throw, do-catch
  • Typed throw
  • Result type

Module content

1
Review Basics Lesson (13 mins)

Review error handling basics and potential issues with simple throw-catch.

 Start
Introduction • Start Reading · 1 min
Optionals Reading · 4 mins
Throw-Catch Reading · 9 mins
Conclusion Reading · 1 min
2
Typed Throws Lesson (7 mins)

Investigate how typed throws can help the compiler help you.

 Start
Introduction • Start Reading · 1 min
Typed Throws Reading · 6 mins
Conclusion Reading · 1 min
3
Result Type Lesson (11 mins)

Learn how and when to use Result type to handle errors in your apps.

 Start
Introduction • Start Reading · 1 min
Result Type Reading · 4 mins
Use Cases Reading · 5 mins
Conclusion Reading · 1 min