Arrays of Generics in Swift

Question

I\'ve been playing around with arrays of generic classes with different types. It\'s easiest to explain my problem with some sample code:

// Obviously a very         


        

Answer 1

I changed the array declaration to be an array of AnyObject so that filter, map and reduce could be used (and also added in a few more objects to check for).

let containers: [AnyObject] = [Container(1, 2, 3), Container(1.0, 2.0, 3.0), "Hello", "World", 42]

This will allow you to check for type in the array and filter before you loop through the array

let strings = containers.filter({ return ($0 is String) })

println(strings) // [Hello, World]

for ints in containers.filter({ return ($0 is Int) }) {
    println("Int is \(foo)") // Int is 42
}

let ints = containers.filter({ return ($0 is Container) })
// as this array is known to only contain Container instances, downcast and unwrap directly
for i in ints as [Container] {
    // do stuff
    println(i.values) // [1, 2, 3]
}