<html><head><style>body{font-family:Helvetica,Arial;font-size:13px}</style></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;"><div id="bloop_customfont" style="font-family:Helvetica,Arial;font-size:13px; color: rgba(0,0,0,1.0); margin: 0px; line-height: auto;">The trues is that `isTrue` doesn’t really make sense because boolean instances are named in a way where `isTrue` is rendered redundant.</div> <br> <div id="bloop_sign_1515870602335282944" class="bloop_sign"></div> <br><p class="airmail_on">Am 13. Januar 2018 um 20:09:41, C. Keith Ray via swift-evolution (<a href="mailto:swift-evolution@swift.org">swift-evolution@swift.org</a>) schrieb:</p> <blockquote type="cite" class="clean_bq"><span><div style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><div></div><div>
<title></title>
<font face="Courier" style="font-size: 14px;" class="">If you would
like something better than "== false" I suggest adding computed
properties </font><span style="font-family: Courier; font-size: 14px;" class="">'isTrue' and
'isFalse'</span> <font face="Courier" style="font-size: 14px;" class="">to Boolean.</font>
<div class=""><font face="Courier" class=""><span style="font-size: 14px;" class=""><br class=""></span></font></div>
<div class=""><font face="Courier" class=""><span style="font-size: 14px;" class=""><br class=""></span></font>
<div>
<blockquote type="cite" class="">
<div class="">On Jan 13, 2018, at 11:06 AM, Karl Wagner via
swift-evolution <<a href="mailto:swift-evolution@swift.org" class="">swift-evolution@swift.org</a>> wrote:</div>
<br class="Apple-interchange-newline">
<div class=""><br style="font-family: Courier; font-size: 14px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px;" class="">
<br style="font-family: Courier; font-size: 14px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px;" class="">
<blockquote type="cite" style="font-family: Courier; font-size: 14px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px;" class="">On 12. Jan 2018, at 20:54, Alejandro Martinez via
swift-evolution <<a href="mailto:swift-evolution@swift.org" class="">swift-evolution@swift.org</a>> wrote:<br class="">
<br class="">
I wouldn't go as far as to ask to fade out ! but in all my code I
end<br class="">
up doing == false just for readability. That ! knows who to
hide<br class="">
himself too well :P<br class="">
<br class=""></blockquote>
<br style="font-family: Courier; font-size: 14px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px;" class="">
<span style="font-family: Courier; font-size: 14px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; float: none; display: inline !important;" class="">Yeah so do I. ! is a very narrow character and totally
changes the meaning of the logic.</span><br style="font-family: Courier; font-size: 14px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px;" class="">
<br style="font-family: Courier; font-size: 14px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px;" class="">
<span style="font-family: Courier; font-size: 14px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; float: none; display: inline !important;" class="">That said, I can’t come up with a clearer name than “==
false”. inverted() isn’t helpful. toggle() on a mutable Bool is
good, though.</span><br style="font-family: Courier; font-size: 14px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px;" class="">
<br style="font-family: Courier; font-size: 14px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px;" class="">
<span style="font-family: Courier; font-size: 14px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; float: none; display: inline !important;" class="">- Karl</span><br style="font-family: Courier; font-size: 14px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px;" class="">
<br style="font-family: Courier; font-size: 14px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px;" class="">
<blockquote type="cite" style="font-family: Courier; font-size: 14px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px;" class="">On Fri, Jan 12, 2018 at 10:13 AM, Adrian Zubarev via
swift-evolution<br class="">
<<a href="mailto:swift-evolution@swift.org" class="">swift-evolution@swift.org</a>> wrote:<br class="">
<blockquote type="cite" class="">I’m not sure if this would be
considered or not, but I would like if the<br class="">
negation operator `!` would fade out.<br class="">
<br class="">
If this is ever going to a review then I’d suggest that we add a
pair of<br class="">
functions, one mutating and the other non-mutating.<br class="">
<br class="">
extension Bool {<br class="">
mutating func invert() {<br class="">
self = !self<br class="">
}<br class="">
<br class="">
func inverted() {<br class="">
return !self<br class="">
}<br class="">
}<br class="">
<br class="">
I’d rather use `inverted` instead of `!` because of the readability
this<br class="">
function provides.<br class="">
<br class="">
if !items.contains(item) { ... }<br class="">
<br class="">
if items.contains(item).inverted() { ... }<br class="">
<br class="">
——<br class="">
<br class="">
I personally have some other extensions like:<br class="">
<br class="">
extension Bool {<br class="">
@discardableResult<br class="">
func whenTrue<T>(execute closure: () throws -> T) rethrows
-> T? {<br class="">
if self { return try closure() }<br class="">
return nil<br class="">
}<br class="">
<br class="">
@discardableResult<br class="">
func whenFalse<T>(execute closure: () throws -> T)
rethrows -> T? {<br class="">
if !self { return try closure() }<br class="">
return nil<br class="">
}<br class="">
}<br class="">
<br class="">
But this is more a personal preference.<br class="">
<br class="">
——<br class="">
<br class="">
That said, if the community is fine with the `invert/inverted` pair
then I’d<br class="">
say go for it ;)<br class="">
<br class="">
Am 12. Januar 2018 um 09:14:22, Nate Cook via
swift-evolution<br class="">
(<a href="mailto:swift-evolution@swift.org" class="">swift-evolution@swift.org</a>) schrieb:<br class="">
<br class="">
<br class="">
On Jan 12, 2018, at 12:15 AM, Chris Eidhof via
swift-evolution<br class="">
<<a href="mailto:swift-evolution@swift.org" class="">swift-evolution@swift.org</a>> wrote:<br class="">
<br class="">
Hey SE!<br class="">
<br class="">
When we have a bunch of nested structs:<br class="">
<br class="">
struct Sample {<br class="">
var bar: Bar<br class="">
}<br class="">
<br class="">
struct Bar {<br class="">
var show: Bool<br class="">
}<br class="">
<br class="">
var foo = Sample(bar: Bar(show: false))<br class="">
<br class="">
It can be repetitive to toggle a deeply nested boolean:<br class="">
<br class="">
foo.bar.show = !foo.bar.show // duplication<br class="">
<br class="">
I sometimes add a `toggle` extension on `Bool`<br class="">
<br class="">
extension Bool {<br class="">
mutating func toggle()
{<br class="">
self =
!self<br class="">
}<br class="">
}<br class="">
<br class="">
This allows you to write the same code without duplication, and
makes the<br class="">
intent clearer:<br class="">
<br class="">
foo.bar.show.toggle()<br class="">
<br class="">
<br class="">
I like it!<br class="">
<br class="">
In other languages, I don't think the `toggle` would make as much
sense, but<br class="">
the mutable self makes this very useful.<br class="">
<br class="">
After I posted it on Twitter, it turns out I'm not the only
one:<br class="">
<a href="https://twitter.com/PublicExtension/status/730434956376346624" class="">https://twitter.com/PublicExtension/status/730434956376346624</a><br class="">
<br class="">
I would have gone straight to a proposal, but I think we can do
some<br class="">
bikeshedding about the name of `toggle`?<br class="">
<br class="">
<br class="">
Another verb that could work is `invert`.<br class="">
<br class="">
The `!` operator that does this is the negation operator, but I
think<br class="">
`negate` could sound to some like "make this false" rather than
toggling.<br class="">
<br class="">
Nate<br class="">
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<br class=""></blockquote>
<br class="">
<br class="">
<br class="">
--<span class="Apple-converted-space"> </span><br class="">
Alejandro Martinez<br class="">
<a href="http://alejandromp.com" class="">http://alejandromp.com</a><br class="">
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swift-evolution@swift.org<br class="">
https://lists.swift.org/mailman/listinfo/swift-evolution<br class=""></blockquote>
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