## Comments

    // this is a comment
    /* this is also a comment,
    but written over multiple lines */

## Numbers

    42
    -23
    3.14159
    0.1
    -273.15
    1.25e-2
    0xC.3p0
    1_000_000
    1_000_000.000_000_1

## Strings

    let someString = "Some string literal value"
    var emptyString = ""
    // String interpolation
    let multiplier = 3
    "\(multiplier) times 2.5 is \(Double(multiplier) * 2.5)"

## Control flow

    for index in 1...5 {
    	println("\(index) times 5 is \(index * 5)")
    }
    for _ in 1...power {
    	answer *= base
    }
    while square < finalSquare {
    	// roll the dice
    	if ++diceRoll == 7 { diceRoll = 1 }
    	// move by the rolled amount
    	square += diceRoll
    	if square < board.count {
    		// if we're still on the board, move up or down for a snake or a ladder
    		square += board[square]
    	}
    }
    switch someCharacter {
    	case "a", "e", "i", "o", "u":
    		println("\(someCharacter) is a vowel")
    	case "b", "c", "d", "f", "g", "h", "j", "k", "l", "m",
    		"n", "p", "q", "r", "s", "t", "v", "w", "x", "y", "z":
    		println("\(someCharacter) is a consonant")
    	default:
    		println("\(someCharacter) is not a vowel or a consonant")
    }

## Classes and attributes

    class MyViewController: UIViewController {
    	@IBOutlet weak var button: UIButton!
    	@IBOutlet var textFields: [UITextField]!
    	@IBAction func buttonTapped(AnyObject) {
    		println("button tapped!")
    	}
    }

    @IBDesignable
    class MyCustomView: UIView {
    	@IBInspectable var textColor: UIColor
    	@IBInspectable var iconHeight: CGFloat
    	/* ... */
    }