Chapter 14, Bronze Challenge Solution

Swift Programming (3rd Edition) 14. Enumerations
1 
enum ShapeDimensions {
    // point has no associated value - it is dimensionless
    case point
    
    // square's associated value is the length of one side
    case square(side: Double)
    
    // rectangle's associated value defines its width and height
    case rectangle(width: Double, height: Double)
    
    func area() -> Double {
        switch self {
        case .point:
            return 0
            
        case let .square(side: side):
            return side * side
            
        case let .rectangle(width: w, height: h):
            return w * h
        }
    }
    
    func perimeter() -> Double {
        switch self {
        case .point:
            return 0
            
        case let .square(side: side):
            return side * 4
            
        case let .rectangle(width: w, height: h):
            return (w * 2) + (h * 2)
        }
    }
}

let squareShape = ShapeDimensions.square(side: 10.0)
let rectangleShape = ShapeDimensions.rectangle(width: 5.0, height: 10.0)
let pointShape = ShapeDimensions.point

print("square's perimeter = \(squareShape.perimeter())")
print("rectangle's perimeter = \(rectangleShape.perimeter())")
print("point's perimeter = \(pointShape.perimeter())")

Edit: Forgot to include the ShapeDimensions declarations.

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