Structs are value types (copy on assign) in Swift - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to create a struct named Point.

Swift

struct [1] {
    var x: Int
    var y: Int
}

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

APoint

BClass

CRectangle

DCircle

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'Class' instead of a struct name.

Choosing a shape name unrelated to the example.

The keyword struct defines a value type named Point.

2fill in blank

medium

Complete the code to assign one struct instance to another.

Swift

var p1 = Point(x: 5, y: 10)
var p2 = [1]

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Ap1

BPoint(x: 0, y: 0)

CPoint()

Dp2

Attempts:

3 left

💡 Hint

Common Mistakes

Creating a new instance instead of copying.

Assigning the variable to itself.

Assigning p1 to p2 copies the value because structs are value types.

3fill in blank

hard

Fix the error in copying and modifying a struct instance.

Swift

var p1 = Point(x: 3, y: 4)
var p2 = p1
p2.[1] = 10

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Az

Bwidth

Cx

Dheight

Attempts:

3 left

💡 Hint

Common Mistakes

Using a property name not defined in the struct.

Trying to modify the original instance instead of the copy.

The struct Point has properties x and y. Modifying x on the copy is valid.

4fill in blank

hard

Fill both blanks to create a copy of a struct and change its property.

Swift

var original = Point(x: 1, y: 2)
var copy = [1]
copy.[2] = 5

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Aoriginal

Bcopy

Cx

Dy

Attempts:

3 left

💡 Hint

Common Mistakes

Modifying the original instead of the copy.

Using the wrong property name.

Assigning original to copy creates a value copy. Then modifying x changes only the copy.

5fill in blank

hard

Fill all three blanks to demonstrate that modifying a copy does not affect the original struct.

Swift

var a = Point(x: 7, y: 8)
var b = [1]
b.[2] = 0
print(a.[3])

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

Aa

Bx

Dy

Attempts:

3 left

💡 Hint

Common Mistakes

Modifying the original struct instead of the copy.

Printing the wrong property.

Copy a into b. Change b.x. Printing a.y shows the original value unchanged.