Swift-protocols and Extensions

the code in the Swift programming language plus part Experiment

 
import UIKit

protocol ExampleProtocol {
    var simpleDescription: String { get }
    mutating func adjust()
} class SimpleClass: ExampleProtocol {
    var simpleDescription: String = "A very simple class." var anotherProperty: Int = 69105 func adjust() {
        simpleDescription += " Now 100% adjusted." }
}
var a = SimpleClass()
a.adjust()
let aDescription = a.simpleDescription struct SimpleStructure: ExampleProtocol {
    var simpleDescription: String = "A simple structure" mutating func adjust() {
        simpleDescription += " (adjusted)" }
}
var b = SimpleStructure()
b.adjust()
let bDescription = b.simpleDescription enum SimpleEnum: ExampleProtocol { case SIMPLE(String)
    var simpleDescription: String { get { switch self { case let .SIMPLE(str): return str
            }
        }
    }
    mutating func adjust() { switch self { case let .SIMPLE(str):
            self = .SIMPLE(str + " (adjusted)")
        }
    }
}
var c = SimpleEnum.SIMPLE("A simple enum")
c.simpleDescription
c.adjust()
c.simpleDescription

extension Int: ExampleProtocol {
    var simpleDescription: String { return "The number \(self)" }
    mutating func adjust() {
        self += 42 }
}
var d = 7 d.simpleDescription
d.adjust()

let protocolValue: ExampleProtocol = a
protocolValue.simpleDescription

Swift-protocols and Extensions