Strategy Design Pattern

Strategy.swift

protocol Strategy {
    func convert(number: Int)
}

class Convert {
    var strategy: Strategy
    var number: Int
    
    init(number: Int, strategy: Strategy) {
        self.number = number
        self.strategy = strategy
    }
    
    func update() {
        self.strategy.convert(number: number)
    }
}

class BinaryStrategy: Strategy {
    func convert(number: Int) {
        let binary = String(number, radix: 2)
        print("Binary is \(binary)")
    }
}

class HexStrategy: Strategy {
    func convert(number: Int) {
        let hex = String(number, radix: 16)
        print("Hex is \(hex)")
    }
}