[swift-evolution] Proposal Sketch: simplify optional unwrapping syntax

[ilya]

I prefer

if let vc = someInterestingViewConroller {
vc.doSomething()
}

- Explicit is better than implicit
- shadowing is bad
- now there's no ambiguity about how to change the original property.

Therefore I'm -1 on any proposal that hides explicit name binding and/or
increases shadowing, including let foo and unwrap foo.

On Sat, Dec 19, 2015 at 21:31 Kevin Wooten via swift-evolution <
swift-evolution at swift.org> wrote:

> As much fun as it to example with foo, I would argue the opposite when you
> use some real world variable names:
>
> if let someInterestingViewConroller = someInterestingViewConroller {
> }
>
> vs
>
> If let someInterestingViewConroller {
> }
>
> We know what let does and it should be enough to impart the necessary
> information for this statement.
>
> When it comes to newcomers I think you'd be hard pressed to find somebody
> who'd be able to understand either form without teaching; so not losing
> much there.
>
>
> On Dec 19, 2015, at 10:01 AM, Chris Lattner via swift-evolution <
> swift-evolution at swift.org> wrote:
>
>
> On Dec 11, 2015, at 8:19 AM, Jeff Kelley via swift-evolution <
> swift-evolution at swift.org> wrote:
>
> I’ve had similar ideas to this. Instead of ditching the if let syntax
> altogether, another approach would be to use the existing name if no new
> name is given, so that this code:
>
> if let foo = foo { /* use foo */ }
>
> could become this code:
>
> if let foo { /* use foo */ }
>
> In both cases, foo is non-optional inside the braces. If you gave it
> another name with the if let syntax, that would work as it does today.
>
>
> Hi Jeff,
>
> This is commonly requested - the problem is that while it does help reduce
> boilerplate, it runs counter to the goal of improving clarity.
>
> -Chris
>
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