Sample code about providing default value with protocol extensions

Protocol Extensions.swift

import UIKit

protocol Moveable {
    func move(to point: CGPoint)
}

extension Moveable {
    func move(to point: CGPoint = .zero) {
        move(to: point)
    }
}

protocol Talkable {
    var greetings: String { get }
}

extension Talkable {
    var greetings: String {
        return "Hello"
    }
}

struct Character: Moveable, Talkable {
    let name: String
    
    init(name: String) {
        self.name = name
    }
    
    func move(to point: CGPoint) {
        print("\(name) moved to \(point)")
    }
}

let mario = Character(name: "Mario")
mario.move(to: CGPoint(x: 3, y: 0))
let luigi = Character(name: "Luigi")
luigi.move()

print(mario.greetings)