I understand *your* idea of let?/let! etc without 'if', but personally I
don't support it. I think `if` must be used in this feature.
In any case I feel like this idea is not accepted by community, so it seems
like there is no sense to discuss its details.
On 18.05.2016 16:12, Daniel Höpfl wrote:
That's the idea of "let?".
"let!" would always execute the block (and crash if the optional is nil.)
"if let!" is meaningless: "let!" would be true (if the optional is set) or
crash (if the optional is nil).
On 2016-05-18 14:27, Vladimir.S wrote:
The idea to process the 'if' block only if anOptional is not null
In case of
let! anOptional {
}
IMO it is not clear that this block will be executed *only* if
anOptional is not null.
if let! anOptional {
// here only if anOptional != null
}
- seems like similar to standard 'if let' construction so should not
confuse too much and IMO will be remembered after the first
appearance/using.
On 18.05.2016 15:15, Daniel Höpfl via swift-evolution wrote:
Would it be possible to drop the "if"? I don't see why we need it.
On 2016-05-18 11:22, LM wrote:
I am experimenting with this:
If var! anOptional {
anOptional // unwrapped, shadowing
}
if let! anOptional {
... // same
}
This compiler codebase is truly remarkable, so it should also works with
If var! opt1 where opt1 < 27 {
}
or
if var! opt1, opt2 {
// both unwrapped
}
LM/
On May 18, 2016, at 10:21 AM, Daniel Höpfl via swift-evolution
<swift-evolution@swift.org> wrote:
Just an idea: Why don’t we think about it similar to try?
var anOptional : String?
let? anOptional { /* use it, but cannot change it */ }
let! anOptional { /* use it, without checking, cannot change it */ }
var? anOptional { /* use it, can also change it, */ }
var! anOptional { /* use it, without checking, can also change it */ }
Is it allowed to set it to nil in the var case? Hard to say.
On 17.05.16 15:43, Vladimir.S via swift-evolution wrote:
It is common to shadow optional value name with unwrapped value with
same name:
if let someGoodValue = someGoodValue {...}
What if we'll have a syntax to not repeat the variable name to achieve
the same target:
if let someGoodValue! {...}
What do you think?
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