Access a struct property by its name as a string in Swift

Question

Let\'s say I have the following struct in Swift:

struct Data {
   let old: Double
   let new: Double
}

Now I have a c

Answer 1

You wouldn't access a struct property by name in Swift any more than you would in C++. You'd provide a block.

Extemporaneous:

func calculateAverage(getter: (Data) -> Double) {
    ... total += getter(data) ...
}

...

calculateAverage({$0.old})
calculateAverage({$0.new})

Possibly with average {$0.old} being a more natural syntax — the verb isn't really helpful and if you're asserting what it is, not what the computer should do, then omitting the brackets looks fine.