Swift Object-Oriented Programming Quiz

Take this quiz to test that you know how to write object-oriented Swift code.

What is the primary goal of object-oriented programming (OOP)?

To promote code reuse and data encapsulation

To write procedural code

To make code run faster

To minimize the use of classes

None

What is an instance in Swift?

A blueprint for an object

A function within a class

A type method

A self-contained module of functionality

None

What does a class represent in Swift?

A function that returns data

A blueprint that defines the properties and methods of an object

A property of an object

A type method

None

What is the purpose of data encapsulation in Swift?

To perform mathematical calculations

To restrict access to data through class methods

To convert data into strings

To make code run faster

None

How are properties declared in a Swift class?

Using the class keyword

Using the var or let keyword

Using the return keyword

Using the function keyword

None

What is the purpose of an instance method in Swift?

To define a type

To initialize a class

To perform operations specific to an instance of a class

To declare properties

None

How is a type method different from an instance method?

A type method is used for mathematical calculations

A type method is always private

A type method is used to initialize an instance

A type method operates on the class itself, not on instances

None

How do you create an instance of a class in Swift?

Using the new keyword

By using the class name followed by parentheses

By calling the init method of the class

Using the func keyword

None

How are class properties accessed in Swift?

Using dot notation

Using the return keyword

Using the let keyword

Using the self keyword

None

10.

What is a computed property in Swift?

A property that is directly assigned a value

A property whose value is calculated dynamically

A property that cannot be changed

A property that is stored in a constant

None

11.

How do you declare a computed property in Swift?

Using the func keyword

By using the init method

Using the return keyword

By using a getter and optionally a setter

None

12.

What is the main advantage of lazy stored properties in Swift?

They allow resource-intensive operations to be deferred until the property is first accessed

They cannot be accessed outside the class

They can be modified anytime

They make the code run faster

None

13.

In which scenario is it mandatory to use the self keyword in Swift?

When initializing properties

When declaring constants

When referencing properties outside the class

When working inside closures

None

14.

What is a protocol in Swift?

A method used for arithmetic operations

A function that returns a specific value

A type of stored property

A set of rules that define the minimum requirements a class must meet

None

15.

What happens if a class adopts a protocol but doesn't meet all its requirements?

The class is ignored

The protocol automatically adds the missing methods

The class will generate a compilation error

The class will run without issues

None

16.

What is the main purpose of opaque return types in Swift?

To hide the specific type returned by a function

To improve the performance of functions

To ensure all functions return the same type

To allow returning multiple types at once

None

17.

How do you declare an opaque return type in Swift?

By declaring the return type as a constant

By specifying the protocol the type conforms to and preceding it with the 'opaque' keyword

Using the init keyword

By specifying the protocol the type conforms to and preceding it with the 'some' keyword

None

18.

Why is using opaque return types beneficial for API developers?

It hides the implementation details and allows changes without breaking dependent code

It makes the API run faster

It ensures that all functions return integers

It allows API functions to return any type

None

19.

What is the relationship between protocols and opaque return types in Swift?

Opaque return types are used for arithmetic operations

Protocols replace the use of return types

Opaque return types must conform to one or more protocols

Opaque return types cannot use protocols

None

20.

How are initializer requirements enforced when a class conforms to a protocol?

By implementing the required initializer in the class

By importing the protocol

By defining a default initializer

By using a private initializer

None

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