saru2020

//Imperative Programming
func filterContacts(aboveAge age: Int) -> [Contact] {
    var filteredContacts = [Contact]()
    for contact in contacts {
        if contact.age > age {
            filteredContacts.append(contact)
        }
    }
    return filteredContacts
}

saru2020

//Functional Programming
let contactsAbove20 = contacts.filter({ $0.age > 20 })
print(contactsAbove20)

saru2020

let contactsDurationArr = contacts.map({ return $0.duration })//We use the map function to derive an array that contains only the duration property of all the objects
var sum = 0
for duration in contactsDurationArr {
    sum = sum + duration
}
print(sum)

saru2020

//Functional Programming
let totalDurationSpentByContacts = contactsDurationArr.reduce(0,+)
print(totalDurationSpentByContacts)

saru2020

extension String {
    /// Used to validate if the given string is valid email or not
    ///
    /// - Returns: Boolean indicating if the string is valid email or not
    func isValidEmail() -> Bool {
        let emailRegEx = "[A-Z0-9a-z._%+-]+@[A-Za-z0-9.-]+\\.[A-Za-z]{2,}"
        
        let emailTest = NSPredicate(format:"SELF MATCHES %@", emailRegEx)
        print("emailTest.evaluate(with: self): \(emailTest.evaluate(with: self))")
        return emailTest.evaluate(with: self)

saru2020

    @IBOutlet weak var emailTextField: UITextField!
    @IBOutlet weak var passwordTextField: UITextField!
    @IBOutlet weak var loginButton: UIButton!

saru2020

let heyThereSequence = Observable.of("Hey there!")
let subscription = heyThereSequence.subscribe { event in
  print(event)
}

Result: 
next("Hey there!") 
completed

saru2020

let heySequence = Observable.from(["H","e","y"])
let subscription = heySequence.subscribe { event in
  switch event {
      case .next(let value):
          print("onNext Event: \(value)")
      case .error(let error):
          print(error)
      case .completed:
          print("onCompleted")
  }

saru2020

let disposeBag = DisposeBag()

let heySequence = Observable.from(["H","e","y"])
let subscription = heySequence.subscribe { event in
    switch event {
    case .next(let value):
        print("onNext, Event: \(value)")
    case .error(let error):
        print(error)
    case .completed:

saru2020

let disposeBag = DisposeBag()
//1
let behaviourRelay = BehaviorRelay<String>(value: "")
//2
let subscription1 = behaviourRelay.subscribe(onNext:{ string in
    print("subscription1: ", string)
})
//3
subscription1.disposed(by: disposeBag)
//4