> On Jan 12, 2018, at 12:15 AM, Chris Eidhof via swift-evolution
> <swift-evolution@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()
I like it!
> 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`?
Another verb that could work is `invert`.
The `!` operator that does this is the negation operator, but I think `negate`
could sound to some like "make this false" rather than toggling.
Nate
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