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Category:Warner Bros. filmsQ:
Swift Array Accessor To Nullify Values
I am trying to achieve something like this, but, just to prevent an issue with the compiler not knowing whether a member has been overridden, I'm trying to use an array accessor instead:
var a: [String]!
var a2: [String]!
var a3: [String]! {
get {
return a2
}
set(newValue) {
a2 = newValue
}
}
But I'm getting an error saying a.append(...) is not a function.
So, is there a way to access a2 and assign it a different value than the one I'm getting from the array?
A:
You cannot do that in a closure, but if the array is mutable, you can
var a = ["a", "b", "c"]
var a2 = [String]()
var a3 = [String]()
a3[0] = "d"
println(a)
println(a2)
The assignment works because you are creating a copy of a2 inside the closure and assign to a3. The mutation happens outside the closure.
If you cannot change a2, you could replace the array with a dictionary. This does have some additional overhead.
var a: [String: String] = ["a": "b", "c": "d"]
var a2: [String: String] = ["a": "c", "b": "d"]
a[0] = "f"
a2[0] = "g"
println(a)
println(a2)
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