We could make Optional conform to CustomStringConvertible:
var description: String {
switch self {
case .some(let x): return "\(x)"
case .none: return "\(Wrapped.self)?.none"
}
}
- Dave Sweeris
> On May 18, 2016, at 15:56, Michael Peternell via swift-evolution
> <[email protected]> wrote:
>
> Well, I wouldn't deprecate them.
>
> Maybe it should print something different: the value itself if it is not nil,
> and "nil" otherwise?
>
> Or there may be an optional warning for this case.
>
> Or maybe both. But not just deprecate the feature altogether. It will make
> people use the "!" instead in unsafe places (like "\(someOptional!)") - it's
> better not to crash and print something strange instead. Especially when in
> production.
>
> -Michael
>
>> Am 18.05.2016 um 20:50 schrieb Krystof Vasa via swift-evolution
>> <[email protected]>:
>>
>> The string interpolation is one of the strong sides of Swift, but also one
>> of its weaknesses.
>>
>> It has happened to me more than once that I've used the interpolation with
>> an optional by mistake and the result is then far from the expected result.
>>
>> This happened mostly before Swift 2.0's guard expression, but has happened
>> since as well.
>>
>> The user will seldomly want to really get the output "Optional(something)",
>> but is almost always expecting just "something". I believe this should be
>> addressed by a warning to force the user to check the expression to prevent
>> unwanted results. If you indeed want the output of an optional, it's almost
>> always better to use the ?? operator and supply a null value placeholder,
>> e.g. "\(myOptional ?? "<<none>>")", or use myOptional.debugDescription -
>> which is a valid expression that will always return a non-optional value to
>> force the current behavior.
>>
>> Krystof
>>
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