Let for constants (immutable) in Swift - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to declare a constant named pi with the value 3.14.

Swift

let [1] = 3.14

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

Api

Bvar

Cradius

Darea

Attempts:

3 left

💡 Hint

Common Mistakes

Using var instead of let for constants.

Choosing a variable name instead of a constant name.

In Swift, let declares a constant. Here, pi is the constant name.

2fill in blank

medium

Complete the code to declare a constant maxScore with the integer value 100.

Swift

let [1] = 100

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

Ascore

BscoreMax

Cmax

DmaxScore

Attempts:

3 left

💡 Hint

Common Mistakes

Using a different name than maxScore.

Using var instead of let.

The constant name should be maxScore as requested.

3fill in blank

hard

Fix the error by completing the code to declare a constant greeting with the value "Hello".

Swift

let [1] = "Hello"

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Alet greeting

Bgreeting

Cvar greeting

Dgreet

Attempts:

3 left

💡 Hint

Common Mistakes

Writing let let greeting or var greeting instead of just the name.

Omitting the constant name.

When declaring a constant, use let once, then the name. Here, only the name greeting goes after let.

4fill in blank

hard

Fill both blanks to declare a constant speedLimit with the value 60 and print it.

Swift

let [1] = 60
print([2])

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

AspeedLimit

Bspeed

Dlimit

Attempts:

3 left

💡 Hint

Common Mistakes

Using different names for declaration and print.

Using var instead of let.

The constant name is speedLimit. Use it both to declare and to print.

5fill in blank

hard

Fill all three blanks to declare constants width and height with values 10 and 20, then print their sum.

Swift

let [1] = 10
let [2] = 20
print([3] + [2])

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

Awidth

Bheight

Dlength

Attempts:

3 left

💡 Hint

Common Mistakes

Using wrong names like length.

Mixing variable and constant declarations.

Declare width and height constants, then print their sum using width + height.