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let randomIntFrom0To10 = Int.random(in: 0 ..< 10)
let randomFloat = Float.random(in: 0 ..< 1)
let greetings = ["hey", "hi", "hello", "hola"]
print(greetings.randomElement()!)
let randomlyOrderedGreetings = greetings.shuffled()
 

struct Restaurant: Equatable {
  let name: String
  let hasTableService: Bool
  let kidFriendly: Bool
}

enum Either<Left, Right> {
 case left(Left)
 case right(Right)
}
extension Either: Equatable where Left: Equatable, Right: Equatable { }


struct City {
 let name: String
 let state: String
 let population: Int
}
extension City: Hashable {
  func hash(into hasher: inout Hasher) {
    name.hash(into: &hasher)
  }
  state.hash(into: &hasher)
}

enum Gait: CaseIterable {
 case walk
 case trot
 case canter
 case gallop
 case jog
}

for gait in Gait.allCases {
 print(gait)
}