small playground used to learn about swift optionals and syntax

swift-optionals.swift

import UIKit

var str = "Hello, playground"

func sayTitle(title: String) {
    print("Title: \(title)")
}

class Movie {
    var title: String?
    var year: String?
    
    init(title: String, year: String) {
        self.title = title
        self.year = year
    }
}

class MyError : Error {
    init() {
    }
}

let myMovie = Movie(title: "Batman", year: "1989")

myMovie.title

print("message: \(str)")
print("movie: \(myMovie)")
sayTitle(title: myMovie.title!)

if let movieTitle = myMovie.title {
    print("movie title in if: \(movieTitle)")
}

myMovie.title = nil

guard let movieTitle = myMovie.title else {
    print("no movie title found!")
    throw MyError()
}