Typealias for custom naming in Swift - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to create a typealias named Age for Int.

Swift

typealias [1] = Int

Drag options to blanks, or click blank then click option'

AInteger

BNumber

CAge

DValue

Attempts:

3 left

💡 Hint

Common Mistakes

Using lowercase names for typealias which is not a convention.

Trying to assign a value instead of a type.

The keyword typealias creates a new name for an existing type. Here, Age is the new name for Int.

2fill in blank

medium

Complete the code to create a typealias named Coordinates for a tuple of two Double values.

Swift

typealias [1] = (Double, Double)

Drag options to blanks, or click blank then click option'

ACoordinates

BPosition

CPoint

DLocation

Attempts:

3 left

💡 Hint

Common Mistakes

Choosing a name that does not clearly represent a pair of values.

Using a typealias name that is too generic.

The typealias Coordinates represents a tuple with two Double values, useful for x and y positions.

3fill in blank

hard

Fix the error in the code by completing the typealias declaration for Text as String.

Swift

typealias [1] = String

Drag options to blanks, or click blank then click option'

AText

Btext

CSTRING

DStr

Attempts:

3 left

💡 Hint

Common Mistakes

Using lowercase names for typealias which causes style warnings.

Using all uppercase which is not conventional for type names.

Typealias names should start with a capital letter by convention. Text is the correct form.

4fill in blank

hard

Fill both blanks to create a typealias named CompletionHandler for a closure that takes a Bool and returns Void.

Swift

typealias [1] = ([2]) -> Void

Drag options to blanks, or click blank then click option'

ACompletionHandler

BBool

CInt

DString

Attempts:

3 left

💡 Hint

Common Mistakes

Using the wrong parameter type in the closure.

Confusing the closure return type with the parameter type.

The typealias CompletionHandler represents a closure that takes a Bool parameter and returns nothing (Void).

5fill in blank

hard

Fill all three blanks to create a typealias named JSONDictionary for a dictionary with String keys and Any values.

Swift

typealias [1] = [[2]: [3]]

Drag options to blanks, or click blank then click option'

AJSONDictionary

BString

CAny

DInt

Attempts:

3 left

💡 Hint

Common Mistakes

Using incorrect types for keys or values.

Mixing up keys and values in the dictionary syntax.

The typealias JSONDictionary defines a dictionary with keys of type String and values of any type (Any), commonly used for JSON data.