shabib87

enum OrderSize {
    case small
    case medium
    case large
}

enum SpiceRange {
    case spicy
    case hot
    case extraHot

shabib87

class Biriyani {
    let count: Int
    let size: OrderSize
    let spiceRange: SpiceRange
    
    init (count: Int, size: OrderSize, spiceRange: SpiceRange) {
        self.count = count
        self.size = size
        self.spiceRange = spiceRange
    }

shabib87

class Biriyani {
    let count: Int
    let size: OrderSize
    let spiceRange: SpiceRange
    let type: BiriyaniType
    
    init (count: Int = 1, size: OrderSize = .medium, spiceRange: SpiceRange = .spicy, type: BiriyaniType = .nonveg) {
        self.count = count
        self.size = size
        self.spiceRange = spiceRange

shabib87

enum BiriyaniType {
    case veg
    case nonveg
}

class Biriyani {
    let count: Int
    let size: OrderSize
    let spiceRange: SpiceRange
    let type: BiriyaniType

shabib87

class Person {
    let name: String
    init(name: String) { 
      self.name = name 
    }
    
    deinit { 
        print("\(name) is being deinitialized") 
    }
}

shabib87

class Person {
    let name: String
    var apartment: Apartment?
    init(name: String) { 
      self.name = name 
    }
    
    deinit { 
        print("\(name) is being deinitialized") 
    }

shabib87

var person: Person? = Person(name: "John Doe")
var apartment: Apartment? = Apartment(number: 123)
person?.apartment = apartment
apartment?.person = person
person = nil
apartment = nil

// output:
//

shabib87

class Person {
    ...
}

class Apartment {
    ...
    weak var person: Person?
    ...
}

shabib87

class HTMLElement {
    
    let name: String
    let text: String?
    
    lazy var asHTML: () -> String = {
        return "<\(self.name)>\(self.text)</\(self.name)>"
    }
    
    init(name: String, text: String? = nil) {

shabib87

class HTMLElement {
    ...
    
    lazy var asHTML: () -> String = { [weak self] in
        guard let htmlElement = self else { return "" }
        return "<\(htmlElement.name)>\(htmlElement.text)</\(htmlElement.name)>"
    }
    
    ...
}