[swift-evolution] [pitch] adding toggle to Bool

[Xiaodi Wu]

Agree: toggle makes the most sense to me as well.
On Fri, Jan 12, 2018 at 06:14 David Hart via swift-evolution <
swift-evolution at swift.org> wrote:

>
>
> On 12 Jan 2018, at 07:15, Chris Eidhof via swift-evolution <
> swift-evolution at swift.org> wrote:
>
> Hey SE!
>
> When we have a bunch of nested structs:
>
>     struct Sample {
>         var bar: Bar
>     }
>
>     struct Bar {
>         var show: Bool
>     }
>
>     var foo = Sample(bar: Bar(show: false))
>
> It can be repetitive to toggle a deeply nested boolean:
>
>     foo.bar.show = !foo.bar.show // duplication
>
> I sometimes add a `toggle` extension on `Bool`
>
>     extension Bool {
>         mutating func toggle() {
>             self = !self
>         }
>     }
>
> This allows you to write the same code without duplication, and makes the
> intent clearer:
>
>     foo.bar.show.toggle()
>
> In other languages, I don't think the `toggle` would make as much sense,
> but the mutable self makes this very useful.
>
> After I posted it on Twitter, it turns out I'm not the only one:
> https://twitter.com/PublicExtension/status/730434956376346624
>
> I would have gone straight to a proposal, but I think we can do some
> bikeshedding about the name of `toggle`?
>
>
> Out of all the versions I heard, toggle is the one that makes the most
> sense to me.
>
> --
> Chris Eidhof
> _______________________________________________
> swift-evolution mailing list
> swift-evolution at swift.org
> https://lists.swift.org/mailman/listinfo/swift-evolution
>
>
> _______________________________________________
> swift-evolution mailing list
> swift-evolution at swift.org
> https://lists.swift.org/mailman/listinfo/swift-evolution
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://lists.swift.org/pipermail/swift-evolution/attachments/20180112/66df85f3/attachment.html>