Khuyên dùng:
let message = "Click the button"
let currentBounds = computeViewBounds()
var names = ["Mic", "Sam", "Christine"]
let maximumWidth: CGFloat = 106.5

Không nên dùng:
let message: String = "Click the button"
let currentBounds: CGRect = computeViewBounds()
let names = [String]()