S.O.L.I.D. Principles with Example (Swift & Dart)
S.O.L.I.D. Principles To create understandable, readable, and testable code that many developers can collaboratively work on. The following five concepts make up our SOLID principles: S ingle Responsibility O pen/Closed L iskov Substitution I nterface Segregation D ependency Inversion 1. Single Responsibility Principle A class should have one and only one reason to change, meaning that a class should have only one job. Problem: class Invoice { let String: Book let price: Float let quantity: Int let discountRate: Int let taxRate: Float var total: Float = 0.0 init(book: Book, price: Float, quantity: Int, discountRate: Int, taxRate: Float) { self.book = book Self.price = price self.quantity = quantity self.discountRate = discountRate self.taxRate = taxRate self.total = self.calculateTotal() } public func calculateTotal() -> Float { let price = ((book.price - book.price * discountRate) * qu