[swift-evolution] [Idea] if let value!

[Vladimir.S]

On 17.05.2016 16:51, Johan Jensen wrote:
 > This was one of the first and most commonly suggested ideas, when the Swift
 > Evolution mailing list first started.
 > Chris Lattner sums it up
 > 
<https://lists.swift.org/pipermail/swift-evolution/Week-of-Mon-20151214/003546.html>
 > in one of those threads:
 >
 >> This is commonly requested - the problem is that while it does help
 > reduce boilerplate, it runs counter to the goal of improving clarity.
 >
 > — Johan

Oh, thank you for letting this know.

Well, I totally disagree with Chris. And as soon as there was no 'official' 
proposal and 'official' decision, I'd like to discuss this more.

I saw a lot of code like
if let mySomeValue = mySomeValue {} in sources and even in books.
Plus, I really believe that
if let mySomeValue! {..} is better in any way: readability, less space for 
errors(when you need to repeat the same name) etc

FWIW, I suggest more explicit variant:
if let value! {...} // with exclamation mark
In that "old" proposal there was `if let value {...}`, was not so clear.

I can't accept an argument that you can use another name - as usually 
'good' name is already 'crafted' for the instance and you want to use it in 
next code.
Otherwise, we need a 'best practice' to name optional variables with some 
prefix or suffix like : mySomeValueOpt, then `if let mySomeValue = 
mySomeValueOpt` will have a sense. But as I understand, we don't want to 
use such approach.
Additionally, when you shadow optional value with same name - you are 
*protecting* yourself from using optional value inside block of unwrapped 
code. IMO it is a good idea.
And want we or don't want, we already have this practice widely. So I 
believe this(my) proposal will improve the code.

I'd like to get opinion of the community regarding this feature.

On 17.05.2016 16:51, Johan Jensen wrote:
> This was one of the first and most commonly suggested ideas, when the Swift
> Evolution mailing list first started.
> Chris Lattner sums it up
> <https://lists.swift.org/pipermail/swift-evolution/Week-of-Mon-20151214/003546.html>
> in one of those threads:
>
>> This is commonly requested - the problem is that while it does help
> reduce boilerplate, it runs counter to the goal of improving clarity.
>
> — Johan
>
> On Tue, May 17, 2016 at 3:43 PM, Vladimir.S via swift-evolution
> <swift-evolution at swift.org <mailto:swift-evolution at swift.org>> 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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>