You want to write a function loadData() that throws a custom error DataError.invalidFormat if data is bad. Which code correctly defines the error and throws it inside the function?

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iOS Swift - Swift Language Essentials

You want to write a function loadData() that throws a custom error DataError.invalidFormat if data is bad. Which code correctly defines the error and throws it inside the function?

Aclass DataError: Error { case invalidFormat } func loadData() throws { throw DataError.invalidFormat }

Bstruct DataError { case invalidFormat } func loadData() throws { throw DataError.invalidFormat }

Cenum DataError: Error { case invalidFormat } func loadData() throws { throw DataError.invalidFormat }

Denum DataError { case invalidFormat } func loadData() throws { throw DataError.invalidFormat }

Step-by-Step Solution

Solution:

Step 1: Define a custom error type conforming to Error
In Swift, custom errors are usually enums conforming to the Error protocol, like enum DataError: Error.
Step 2: Throw the custom error inside the function
The function loadData() declares throws and throws DataError.invalidFormat correctly.
Final Answer:
enum DataError: Error { case invalidFormat } func loadData() throws { throw DataError.invalidFormat } -> Option C
Quick Check:
Custom errors use enum + Error protocol [OK]

Quick Trick: Use enum conforming to Error for custom errors [OK]

Common Mistakes:

Not conforming error type to Error protocol
Using struct or class without Error conformance
Forgetting throws keyword in function

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More iOS Swift Quizzes

You want to write a function loadData() that throws a custom error DataError.invalidFormat if data is bad. Which code correctly defines the error and throws it inside the function?

Step 1: Define a custom error type conforming to Error

Step 2: Throw the custom error inside the function

Final Answer:

Quick Check:

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