I’m not sure if this would be considered or not, but I would like if the
negation operator `!` would fade out.
If this is ever going to a review then I’d suggest that we add a pair of
functions, one mutating and the other non-mutating.
extension Bool {
mutating func invert() {
self = !self
}
func inverted() {
return !self
}
}
I’d rather use `inverted` instead of `!` because of the readability this
function provides.
if !items.contains(item) { ... }
if items.contains(item).inverted() { ... }
——
I personally have some other extensions like:
extension Bool {
@discardableResult
func whenTrue<T>(execute closure: () throws -> T) rethrows -> T? {
if self { return try closure() }
return nil
}
@discardableResult
func whenFalse<T>(execute closure: () throws -> T) rethrows -> T? {
if !self { return try closure() }
return nil
}
}
But this is more a personal preference.
——
That said, if the community is fine with the `invert/inverted` pair then I’d
say go for it ;)
Am 12. Januar 2018 um 09:14:22, Nate Cook via swift-evolution
(swift-evolution@swift.org) schrieb:
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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