Module 3 of 4 in Advanced Swift Techniques

Advanced Error Handling & Result Types

Sep 5 2025, Swift 5.9, iOS 18, Xcode 16.4

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

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

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

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

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

Module outcomes

Covered concepts

Module content

App Observability

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