OpenClosedPrinciple

import UIKit

//SOLID PRINCIPLE - 2 - OPEN CLOSE PRINCIPLE
protocol Printable {
    func printDetails() -> String
}

//OPEN FOR EXTENSION, BUT CLOSED FOR MODIFICATION.
class Logger {
    static var logs: [Printable] = [ ]
    static func printData() {
        logs.forEach { log in
            print(log.printDetails()) //STRATERGY PATTERN (printDetails() called on fly based on object type)
        }
    }
}

class Car: Printable {
    let name: String
    let color: String
    init(name: String, color: String) {
        self.name = name
        self.color = color
        Logger.logs.append(self)
    }
    func printDetails() -> String {
        return "I'm \(name) and my color is \(color)"
    }
}

class Bicycle: Printable {
    let type: String
    init(type: String) {
        self.type = type
        Logger.logs.append(self)
    }
    func printDetails() -> String {
        return "I'm a \(type)"
    }
}

let car1 = Car(name: "BMW", color: "white")
let car2 = Car(name: "Mustang", color: "white")
let car3 = Car(name: "Tesla", color: "white")
let car4 = Car(name: "Honda", color: "white")

let b1 = Bicycle(type: "TATA")
let b2 = Bicycle(type: "NanoBot")

Logger.printData()