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 make code run faster

To write procedural code

To promote code reuse and data encapsulation

To minimize the use of classes

None

What is an instance in Swift?

A self-contained module of functionality

A type method

A function within a class

A blueprint for an object

None

What does a class represent in Swift?

A blueprint that defines the properties and methods of an object

A property of an object

A type method

A function that returns data

None

What is the purpose of data encapsulation in Swift?

To convert data into strings

To restrict access to data through class methods

To perform mathematical calculations

To make code run faster

None

How are properties declared in a Swift class?

Using the class keyword

Using the return keyword

Using the var or let keyword

Using the function keyword

None

What is the purpose of an instance method in Swift?

To perform operations specific to an instance of a class

To define a type

To declare properties

To initialize a class

None

How is a type method different from an instance method?

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

A type method is used for mathematical calculations

A type method is always private

A type method is used to initialize an instance

None

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

By using the class name followed by parentheses

By calling the init method of the class

Using the new keyword

Using the func keyword

None

How are class properties accessed in Swift?

Using the self keyword

Using the return keyword

Using the let keyword

Using dot notation

None

10.

What is a computed property in Swift?

A property that cannot be changed

A property whose value is calculated dynamically

A property that is stored in a constant

A property that is directly assigned a value

None

11.

How do you declare a computed property in Swift?

By using a getter and optionally a setter

Using the func keyword

Using the return keyword

By using the init method

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 working inside closures

When declaring constants

When referencing properties outside the class

When initializing properties

None

14.

What is a protocol in Swift?

A type of stored property

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

A method used for arithmetic operations

A function that returns a specific value

None

15.

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

The class will run without issues

The class is ignored

The class will generate a compilation error

The protocol automatically adds the missing methods

None

16.

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

To improve the performance of functions

To hide the specific type returned by a function

To allow returning multiple types at once

To ensure all functions return the same type

None

17.

How do you declare an opaque return type in Swift?

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

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

Using the init keyword

By declaring the return type as a constant

None

18.

Why is using opaque return types beneficial for API developers?

It ensures that all functions return integers

It allows API functions to return any type

It makes the API run faster

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

None

19.

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

Opaque return types must conform to one or more protocols

Opaque return types cannot use protocols

Opaque return types are used for arithmetic operations

Protocols replace the use of return types

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 using a private initializer

By defining a default initializer

None

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