How should I design protocol hierarchies without overusing inheritance?

In Swift, designing protocol hierarchies effectively requires careful consideration to avoid overusing inheritance. Utilizing protocols promotes code reusability, separation of concerns, and flexibility, while minimizing the downsides of deep inheritance trees.

Swift, protocols, inheritance, protocol design, code reusability, software design


        // Define the base protocol
        protocol Drawable {
            func draw()
        }

        // Extend the Drawable protocol to add functionality
        protocol ColorfulDrawable: Drawable {
            var color: String { get }
        }

        // Implement a class that conforms to the ColorfulDrawable protocol
        class Circle: ColorfulDrawable {
            var radius: Double
            var color: String
            
            init(radius: Double, color: String) {
                self.radius = radius
                self.color = color
            }
            
            func draw() {
                print("Drawing a \(color) circle with radius \(radius)")
            }
        }

        // Implement another class conforming to the Drawable protocol
        class Rectangle: Drawable {
            var width: Double
            var height: Double
            
            init(width: Double, height: Double) {
                self.width = width
                self.height = height
            }
            
            func draw() {
                print("Drawing a rectangle of width: \(width) and height: \(height)")
            }
        }

Swift protocols inheritance protocol design code reusability software design

How should I design protocol hierarchies without overusing inheritance?

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How should I design protocol hierarchies without overusing inheritance?

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