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// Your challenge is this: write a function that
// accepts an optional array of integers and returns
// one randomly. If the array is missing or empty,
// return a random number in the range 1 through 100.

func randomSelector(arr: [Int]?) -> Int  {
    arr?.randomElement() ?? Int.random(in: 1 ... 100)
}

print(randomSelector(arr: [0,4,5,6]))
print(randomSelector(arr: nil))