Coder Radio 280: 1

Gungan.swift

// for Coder Radio 280
//: Playground - noun: a place where people can play

import UIKit

class Gungan {
    var name: String = "" // I am not optional, so I must have an initializer
    var fifthGradeDiploma: String? // I, sadly, am an optional
    
    func greet(jedi: String) -> String {
        return "Hey " + jedi + " messa "  + name + "!";
    }
    
    func darkSideGreet(darkJedi: String!) -> String {
        return "Hey " + darkJedi + " messa "  + name + "!";
    }
    
    func bragAboutEducation() -> String {
        if let education = fifthGradeDiploma {
            return "Messa went to " + education + " up to grade five!";
        } else {
            return "Messa no know what school is...";
        }
    }
}

let jar = Gungan();
// if you pass a valid value here you are good to go
jar.greet(jedi: "Qui Gon");

// because 'jedi' is not marked as optional, the Swift compiler will throw a dev time error
jar.greet(jedi: nil);

// this is going to work fine with a good a value
jar.darkSideGreet(darkJedi: "Count Dooku");

// however, if you pass nil, then run time pain...
//fatal error: unexpectedly found nil while unwrapping an Optional value
jar.darkSideGreet(darkJedi: nil);