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Previewing Swift 5 Result Type

https://www.infoq.com/news/2019/01/swift-5-result-type
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Jan 10, 2019 6:00 PM 3+ mon ago

Previewing Swift 5 Result Type

One of the most awaited proposals for Swift 5, Result, has already landed into the language. The Result type forces the programmer to explicitly handle the failure and success cases before they can gain access to the actual value. Let's have a look at how it is implemented, how you can use it, and why it was needed.

The Result type is meant to enforce a safe way to handle errors returned by a function call without resorting to exceptions. While exceptions provide an automatic mechanism for error propagation and handling, Result provides a manual mechanism with stronger type guarantees and more suitable to async error handling. Similarly to the Option type, the Result type is a monad.

You can define a simple function returning a Result and handle its result like this:

Additionally, to make it easier to integrate with ...

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