Swift 1.2 book geek humor

Love the little references to geek-loved stuff like “Hitchhiker’s Guide to the Galaxy” littered throughout the book. Like:

let somePlanet = Planet.Earth
switch somePlanet {
case .Earth:
    print("Mostly harmless")
default:
    print("Not a safe place for humans")
}
// prints "Mostly harmless”

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