Learn SwiftUI (Day 11/100)

import Cocoa // ## private struct BankAccount { private var funds = 0 } /* * Use private for “don’t let anything outside the struct use this.” * Use private(set) for “let anyone read this property, but only let my methods write it.” * Use fileprivate for “don’t let anything outside the current file use this.” * Use public for “let anyone, anywhere use this.” */ // ## static variable and function struct School { static var studentCount = 0 static func add(student: String) { print("\(student) joined the school.") studentCount += 1 } } // ## self and Self /* To access static code from non-static code, always use your type’s name such as School.studentCount. You can also use Self to refer to the current type. */ // ## singleton struct Employee { let username: String let password: String static let example = Employee(username: "abc", password: "xyz") } // ## Check point /* create a struct to store information about a car, including its model, number of seats, and current gear, then add a method to change gears up or down. Have a think about variables and access control: what data should be a variable rather than a constant, and what data should be exposed publicly? Should the gear-changing method validate its input */ struct Car { let model: String let numberOfSeats: Int private var currentGear: Int init(model: String, numberOfSeats: Int) { self.model = model self.numberOfSeats = numberOfSeats self.currentGear = 0 } mutating func gearUp() -> Bool { if self.currentGear == 6 { return false } self.currentGear += 1 return true } mutating func gearDown() -> Bool { if self.currentGear == 0 { return false } self.currentGear -= 1 return true } }