Why Swift is strongly typed - Test Your Understanding

Practice - 5 Tasks

1fill in blank

easy

Complete the code to declare a variable with a specific type in Swift.

Swift

var name: [1] = "Alice"

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

AString

Bint

Cfloat

Dboolean

Attempts:

3 left

💡 Hint

Common Mistakes

Using lowercase types like int or boolean which are not valid in Swift.

In Swift, you declare a variable's type explicitly using String for text values.

2fill in blank

medium

Complete the code to declare a constant integer in Swift.

Swift

let age: [1] = 30

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

ADouble

BString

CInt

DBool

Attempts:

3 left

💡 Hint

Common Mistakes

Using Double or String instead of Int for whole numbers.

Use Int to declare an integer type in Swift.

3fill in blank

hard

Fix the error in the code by specifying the correct type for the variable.

Swift

var isActive: [1] = true

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

Afloat

BString

Cint

DBool

Attempts:

3 left

💡 Hint

Common Mistakes

Using lowercase or incorrect types like int or float for Boolean values.

The type Bool is used for true/false values in Swift.

4fill in blank

hard

Fill both blanks to create a dictionary with String keys and Int values.

Swift

var scores: [[1]: [2]] = ["Math": 90, "Science": 85]

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

AString

BInt

CDouble

DBool

Attempts:

3 left

💡 Hint

Common Mistakes

Mixing up key and value types or using incorrect types like Double or Bool.

Dictionaries in Swift use square brackets with key and value types separated by a colon. Here, keys are String and values are Int.

5fill in blank

hard

Fill all three blanks to create a typed array and access its first element.

Swift

var fruits: [[1]] = ["Apple", "Banana", "Cherry"]
let firstFruit: [2] = fruits[[3]]

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

AString

B0

DInt

Attempts:

3 left

💡 Hint

Common Mistakes

Using wrong types for the array or index, or wrong index number.

The array fruits holds String values. The first element is accessed at index 0 and assigned to a variable of type String.