Adding computed properties in Swift - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to add a computed property that returns the full name.

Swift

struct Person {
    var firstName: String
    var lastName: String
    var fullName: String {
        return firstName [1] lastName
    }
}

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

A+ " " +

B-

C*

D/

Attempts:

3 left

💡 Hint

Common Mistakes

Using arithmetic operators like '-' or '*' instead of '+' for strings.

Forgetting to add a space between first and last names.

The computed property fullName combines firstName and lastName with a space in between using the + operator.

2fill in blank

medium

Complete the code to add a computed property that calculates the area of a rectangle.

Swift

struct Rectangle {
    var width: Double
    var height: Double
    var area: Double {
        return width [1] height
    }
}

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

A-

B+

C/

D*

Attempts:

3 left

💡 Hint

Common Mistakes

Using addition instead of multiplication.

Using division or subtraction which are incorrect for area calculation.

The computed property area multiplies width and height to calculate the rectangle's area.

3fill in blank

hard

Fix the error in the computed property that returns the age in months.

Swift

struct Person {
    var ageInYears: Int
    var ageInMonths: Int {
        return ageInYears [1] 12
    }
}

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

A+

B*

C-

D/

Attempts:

3 left

💡 Hint

Common Mistakes

Using addition instead of multiplication.

Using division which would give incorrect results.

To convert years to months, multiply the age in years by 12.

4fill in blank

hard

Fill both blanks to create a computed property that returns the perimeter of a rectangle.

Swift

struct Rectangle {
    var width: Double
    var height: Double
    var perimeter: Double {
        return (width [1] height) [2] 2
    }
}

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

A+

B*

C-

D/

Attempts:

3 left

💡 Hint

Common Mistakes

Multiplying width and height instead of adding.

Forgetting to multiply the sum by 2.

The perimeter of a rectangle is 2 times the sum of width and height. So first add width and height, then multiply by 2.

5fill in blank

hard

Fill all three blanks to create a computed property that returns the initials of a person.

Swift

struct Person {
    var firstName: String
    var lastName: String
    var initials: String {
        return firstName[1].uppercased() [2] lastName[3].uppercased()
    }
}

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

A[first]

B+

D-

Attempts:

3 left

💡 Hint

Common Mistakes

Using subtraction instead of addition to join strings.

Not using subscript to get the first character.

Not converting characters to uppercase.

The computed property initials takes the first character of firstName and lastName, converts them to uppercase, and joins them with +.