> On 6 Aug 2016, at 7:50 AM, Fernando Rodríguez via swift-evolution
> <[email protected]> wrote:
>
> Hi,
>
> I do a lot of training and one of the features of Swift that seems more
> confusing to students (and myself) is error handling. There are too many ways
> of doing it, and none seems satisfactory.
>
> Let's take for example an initializer. There are 2 different ways of handling
> errors within an init:
>
> a) Old School: return nil. This was very simple in Objective C, because the
> uncommon case of an error could be easily ignored...until everything crashed.
>
> In Swift it's not easy (nor advisable IMHO) to completely ignore the
> possibility of an error. Besides, it has 2 complications.
>
> First of all, you return an Optional, and Optionals have a tendency to go
> viral. Suddenly, all your code has to deal with optionals.
>
> Secondly, you have no information about the error itself.
>
> b) do/try/catch
>
> This allows you to have information about the error, but also causes the
> newly created object to be "trapped" inside a do block.
You can define an uninitialised variable outside the scope of `do`, and assign
to it within the scope of `do`.
func test() throws -> Int { return 1 }
let variable: Int
do {
variable = try test()
} catch let error {
fatalError("\(error)")
}
print(variable)
>
> Are there any plans to address this situation? I believe there should be a
> single, obvious and convenient way of handling errors in the language.
>
> What do you guys think?
>
>
>
> --
>
>
>
> <http://keepcoding.io/es/>
>
> Fernando Rodríguez
> m. +34 610 965 332
> t. +34 91 629 57 61
> fernando@k <mailto:[email protected]>eepcoding.io <http://eepcoding.io/>
>
> KeepCoding.io
> 2120 University Avenue, Berkeley, CA
>
> Avda. Fuencarral, 44, Ed. 8, Loft 30
> 28108 Alcobendas (Madrid) Spain
>
>
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