Currently, the syntax for explicitly naming property setters is:
class Square {
var sideLength: Double = 0.0
var perimeter: Double {
get {
return sideLength * 4.0
}
set(newPerimeter) { // declares newPerimeter parameter, "let" not
allowed
sideLength = newPerimeter / 4.0
}
}
}
Compare this with how extraction of associated values from enumerations
looks:
enum ServerResponse {
case Failure(String)
case Result(Int)
}
let response = ServerResponse.Result(404)
switch response {
case .Failure(let reason): // let is required here
print(reason)
case .Result(let code):
print(code)
}
For consistency, would it be better to allow/require:
class Square {
var sideLength: Double = 0.0
var perimeter: Double {
get {
return sideLength * 4.0
}
set(*let* newPerimeter) { // declares newPerimeter parameter
sideLength = newPerimeter / 4.0
}
}
}
The idea would apply to didSet{} and willSet{} too.
--
Ian Partridge
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