> On Mar 23, 2016, at 3:32 AM, Brent Royal-Gordon via swift-evolution
> <swift-evolution@swift.org> wrote:
>
>> let john = {firstName="John"; lastName="Doe"}
>> let alice = {john with FirstName="Alice"}
>>
>> Current way to do this in Swift is:
>>
>> let john = (firstName:"John", lastName:"Doe")
>> var alice = john
>> alice.firstName = "Alice"
>
> I think this is better modeled in Swift as something like:
>
> let john = (firstName:"John", lastName:"Doe")
> let alice = with(john) {
> $0.firstName = "Alice"
> }
You can kind of do this now:
struct Person {
var firstName, lastName: String
}
func modify<T>(item: T, update: (inout T) -> Void) -> T {
var this = item
update(&this)
return this
}
let carol: Person = modify(john) {
$0.firstName = "Carol"
}
print(carol)
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