To create an empty array or dictionary, use the initialiser syntax.
let emptyArray = [String]()
let emptyDictionary = [String: Float]()
let individualScores = [75, 43, 103, 87, 12]
let interestingNumbers = [
"Prime": [2, 3, 5, 7, 11, 13],
"Fibonacci": [1, 1, 2, 3, 5, 8],
"Square": [1, 4, 9, 16, 25],
]