Memory Management & Access Control

Question 1

TF: All memory management only applies to reference types

Answer 1

True, cannot use for value types like structs.

Question 2

Deinit is used for what?

Answer 2

to break the class down or deallocate the class

Question 3

IB outlets are what kind of reference by default?

Answer 3

Weak

Question 4

We have the protocol below and we want the customer class to inherit it. Why do we have to put the class in the protocol? 
protocol Loan: class {
    var payee: Customer { get set }
}

class Customer {
    weak var loan: Loan?
}

Answer 4

we have to put class in Loan protocol because we have to use reference types when working with weak references

Question 5

TF: Swift makes use of Manual Retain Release.

Answer 5

False

Question 6

Assume you created a custom class with a stored property. By default, references to that property will be:

Answer 6

Strong

Question 7

TF: Strong retain cycles used to be very common before ARC, nowadays, it is nearly impossible to accidentally create one in Swift.

Answer 7

False

Question 8

When we talk about allocating memory on a mobile device, we are talking about:

Answer 8

RAM

Question 9

In Swift, if you find that you have created a strong reference cycle, how should you fix it?

Answer 9

Change one of the strong references to weak, using the weak keyword.

Question 10

What are the five levels we can restrict our code to?

Answer 10

Open 
Public
Internal 
Fileprivate 
Private

Question 11

The member of the class are what by default?
private class SomeClass {}

Answer 11

All members of this class are private

Question 12

What access level is enabled by default?

Answer 12

Internal

Question 13

TF: Internal access enables entities to be used within any source file from their defining module and in any source file outside of the module.

Answer 13

False

Question 14

TF: A Swift source file exists within a module

Answer 14

True

Question 15

How do we know what level a member of a class can be depending on the class itself?

Answer 15

A member can be anything lower than the type of the class itself.

So if a class is private, all members have to be private.

If a class is internal, all members can be fileprivate or private.