Randomly pick a deserving team member to give your WWDC ticket too. Allows for weighting in case you like some more than others.

wwdc.swift

#!/usr/bin/env xcrun swift

import Foundation

struct Teammate {
    let name: String
    let weighting: Int
}

let teammates = [
    Teammate(name: "Foo", weighting: 3),
    Teammate(name: "Bar", weighting: 2),
    Teammate(name: "Baz", weighting: 3)
]

let entries = teammates.flatMap {
    [String](count: $0.weighting, repeatedValue: $0.name)
}

let winner = entries[Int(arc4random_uniform(UInt32(entries.count)))]

println(winner)