can someone help me understand this section under ...

# multiplatform

[oday]

can someone help me understand this section under the code? are they explaining the reasoning behind using the generic Exception class?

[Jeff Lockhart]

Yes. See docs. Because Kotlin doesn't have checked exceptions, but Swift only has checked exceptions, in order for exceptions to be caught in Kotlin and propagated in Swift as a checked exception, you have to declare the exceptions with a @Throws annotation, with the exception types that Kotlin should catch and propagate as checked exceptions. In this case, using Exception::class tells Kotlin to catch and propagate all Exception types as checked exceptions in Swift.

[oday]

Ah so the type of exception can be whatever I want

[oday]

@Throws is the mandatory part for iOS

[Jeff Lockhart]

Yes. Any exception type not included in the annotation won't propagate as checked and will terminate the program.

[oday]

Oh it will outright crash when on iOS as if you didn’t handle it, cause not propagated, got it thanks

[Jeff Lockhart]

As a suspend function, it will propagate CancellationException automatically, without the explicit annotation. But any other expected exception type needs to be declared.