Swift_Optional_Part_4.swift

//////////////////////////////////////////////////////////
//
// Chater 4 - Tim's Era
//
//////////////////////////////////////////////////////////

extension Company {

    func isBiggerThan(company: Company) -> Bool {
        if marketCapital == nil || company.marketCapital == nil {
            print("Cannot compare market capital with a private company")
            return false
        }

        // Comparing optionals
        if marketCapital > company.marketCapital {
            print("\(name) is bigger than \(company.name)")
            return true
        }
        print("\(name) is not bigger than \(company.name)")
        return false
    }

}

apple.marketCapital = 624.4 // As of Oct 11, 2015
var google = Company(name: "Google", stock: "GOOG", capital: 450.7) // As of Oct 11, 2015
var dell = Company(name: "Dell")

apple.isBiggerThan(google) // true; "Apple Inc is bigger than Google"
apple.isBiggerThan(dell) // false; "Cannot compare market capital with a private company"