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Generated on 8/3/2024
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What is "type throws" in Swift?
"Type throws" is a new feature introduced in Swift 6 that enhances the error handling system by allowing you to specify the error type along with the throws keyword. This means that there is no type erasure involved, and the error appears in the catch block with its concrete type. This feature is a generalization of the existing error handling system, where untyped throws are equivalent to type throws with an Any error type, and a non-throwing function is equivalent to a function with a type throw of the Never type.
Type throws allows for more precise API contracts and can be particularly useful in constrained environments where untyped throws are cost-prohibitive. It also helps avoid code duplication by allowing functions like map to be written generically over the failure type, abstracting over both throwing and non-throwing cases.
For more details, you can watch the session What’s new in Swift (24:19).
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