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
}
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!"
)
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
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