Why reinvent the wheel, when the old trusty (but a bit cryptic according to
some) tri-op can do the trick…
> Le 23 mai 2016 à 04:29, Charles Constant via swift-evolution
> <[email protected]> a écrit :
>
> Here's a few examples of what this change would allow.
>
> I just plucked the first instances of other people's switch statements that I
> found on GitHub.
>
> If there were an easy way to search GitHub for chained ternary expressions, I
> would have added some examples of those too, since they could all be improved
> with this where clause + ??.
>
>
> mutating func toggle() {
> switch self{
> case Off:
> self = On
> case On:
> self = Off
> }
> }
>
>
>
> mutating func toggle() {
> self = .On where (self == .Off) ?? .Off
> }
>
mutating func toggle() { self = self == .Off ? .On : .Off }
>
> switch switchNumberThree {
> case 10, 11, 12:
> println("It is \(switchNumberThree)")
> default:
> ("It is none of them!")
> }
>
>
> println(
> "It is \(switchNumberThree)" where 10...12 ~= switchNumberThree
> ?? "It is none of them!"
> )
>
print( 10...12 ~= switchNumberThree ? "It is \(switchNumberThree)"
: "It's none of them" )
>
> switch x {
> case 1:
> j++
> case 2:
> j++
> case 3:
> j++
> case 4:
> j++
> fallthrough
> case 5:
> j++
> fallthrough
> default:
> j++
> }
>
>
> j = j+1 where (4...5 ~= x) ?? j+2
>
Broken conversion:
j += 4...5 ~= x ? 1 : 2
Proper conversion:
j += 4 ~= x ? 3 : 5 ~= x ? 2 : 1
Earlier e-mail example:
> let foo =
> "positive" where ( bar > 0 ) ??
> "negative" where ( bar < 0 ) ??
> "zero"
let foo = bar > 0 ? "positive" :
bar < 0 ? "negative" :
"zero"
Dany_______________________________________________
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