How do I apply SOLID principles in Swift code?

Applying SOLID principles in Swift code is essential for writing maintainable, scalable, and testable applications. SOLID is an acronym representing five principles that guide object-oriented design:

S - Single Responsibility Principle: A class should have one and only one reason to change.
O - Open/Closed Principle: Software entities should be open for extension but closed for modification.
L - Liskov Substitution Principle: Objects of a superclass should be replaceable with objects of a subclass without altering the desirable properties of the program.
I - Interface Segregation Principle: Clients should not be forced to depend on interfaces they do not use.
D - Dependency Inversion Principle: Depend on abstractions, not on concretions.

Here is an example demonstrating these principles in Swift:


        // Example demonstrating SOLID principles in Swift
        protocol Shape {
            func area() -> Double
        }

        class Rectangle: Shape {
            var width: Double
            var height: Double

            init(width: Double, height: Double) {
                self.width = width
                self.height = height
            }

            func area() -> Double {
                return width * height
            }
        }

        class Circle: Shape {
            var radius: Double

            init(radius: Double) {
                self.radius = radius
            }

            func area() -> Double {
                return Double.pi * radius * radius
            }
        }
        
        class AreaCalculator {
            func calculateArea(shapes: [Shape]) -> Double {
                var totalArea: Double = 0
                for shape in shapes {
                    totalArea += shape.area()
                }
                return totalArea
            }
        }

        // Usage
        let shapes: [Shape] = [Rectangle(width: 4, height: 5), Circle(radius: 3)]
        let calculator = AreaCalculator()
        let totalArea = calculator.calculateArea(shapes: shapes)
        print("Total area: \(totalArea)")

How do I apply SOLID principles in Swift code?

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How do I apply SOLID principles in Swift code?

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