Return from initializer without initializing all stored properties

Question

I have a simple class like this.

public class User {
    let id: Int
    let firstName: String
    let lastName: String
    let email: String?

    init(id:          


        

Answer 1

First of all make it clear that every let variable must be assigned value at declaration time. So your statements will be

let id: Int  = 0
let firstName: String = "test"
let lastName: String = "Test"
let email: String? = "Test"

Secondly in classes, you must have to initialize variables or define them as optional types by either putting '?' or '!' with every variable. Like

let id: Int!
let firstName: String!
let lastName: String!
let email: String?

or

let id: Int?
let firstName: String?
let lastName: String?
let email: String?

But want to say you here that these variables will not be able to change as they are constants. so you must use var with these if you'r not passing value at time of declaration. Your final code in this case will be some kind of this

var id: Int
var firstName: String
var lastName: String
var email: String?