Variables (let, var) and type inference in iOS Swift - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to declare a constant named name with value "Alice".

iOS Swift

let [1] = "Alice"

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

Aname

Bvar

Clet

DName

Attempts:

3 left

💡 Hint

Common Mistakes

Using var instead of let for a constant.

Capitalizing variable names incorrectly.

Use let to declare a constant and name as the variable name.

2fill in blank

medium

Complete the code to declare a variable age with initial value 30.

iOS Swift

var [1] = 30

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

Aage

Blet

CAge

Dvar

Attempts:

3 left

💡 Hint

Common Mistakes

Using let instead of var for a variable.

Capitalizing variable names incorrectly.

Use var to declare a variable and age as the variable name.

3fill in blank

hard

Fix the error in the code by choosing the correct keyword to declare a variable that can change.

iOS Swift

[1] score = 100
score = 150

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

Afinal

Blet

Cconst

Dvar

Attempts:

3 left

💡 Hint

Common Mistakes

Using let for variables that need to change.

Using JavaScript keywords like const or final.

Use var to declare a variable that can be changed later.

4fill in blank

hard

Fill both blanks to declare a variable height of type Double with value 1.75.

iOS Swift

var [1]: [2] = 1.75

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

Aheight

BInt

CDouble

Dvar

Attempts:

3 left

💡 Hint

Common Mistakes

Using Int type for decimal numbers.

Putting the type before the variable name.

Use height as the variable name and Double as the type for decimal numbers.

5fill in blank

hard

Fill all three blanks to declare a constant greeting with inferred type and value "Hello".

iOS Swift

[1] [2] = [3]

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

Alet

Bgreeting

C"Hello"

Dvar

Attempts:

3 left

💡 Hint

Common Mistakes

Using var instead of let for constants.

Forgetting quotes around string values.

Use let for constant, greeting as name, and "Hello" as value with type inferred.