Defining methods in Go - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to define a method named Greet for the Person struct.

Go

type Person struct {
    Name string
}

func (p [1]) Greet() string {
    return "Hello, " + p.Name
}

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

Aperson

B*Person

CPerson

Dp

Attempts:

3 left

💡 Hint

Common Mistakes

Using a variable name instead of a type name as receiver.

Forgetting parentheses around the receiver.

The method receiver must be a type name or pointer type. Here, Person is correct to define the method on the struct value.

2fill in blank

medium

Complete the code to define a method Area for the Rectangle struct that returns the area as an int.

Go

type Rectangle struct {
    Width, Height int
}

func (r [1]) Area() int {
    return r.Width * r.Height
}

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

Arectangle

B*Rectangle

Crect

DRectangle

Attempts:

3 left

💡 Hint

Common Mistakes

Using a variable name instead of a type name.

Omitting the pointer when the method needs to modify the struct.

Using a pointer receiver *Rectangle allows the method to work efficiently and modify the struct if needed.

3fill in blank

hard

Fix the error in the method receiver declaration to correctly define method Double for Counter.

Go

type Counter struct {
    Value int
}

func (c [1]) Double() {
    c.Value = c.Value * 2
}

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

A*Counter

Bcounter

CCounter

Dc

Attempts:

3 left

💡 Hint

Common Mistakes

Using a value receiver which copies the struct and does not modify the original.

Using a variable name instead of a type name.

To modify the struct field inside the method, the receiver must be a pointer *Counter.

4fill in blank

hard

Fill both blanks to define a method IsSquare for Rectangle that returns true if width equals height.

Go

func (r [1]) IsSquare() bool {
    return r.Width [2] r.Height
}

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

A*Rectangle

BRectangle

C==

D!=

Attempts:

3 left

💡 Hint

Common Mistakes

Using a value receiver when pointer is preferred.

Using the wrong comparison operator.

The method uses a pointer receiver *Rectangle and compares width and height with ==.

5fill in blank

hard

Fill all three blanks to define a method UpdateName for Person that sets the Name field to a new value.

Go

func (p [1]) UpdateName(newName [2]) {
    p.Name = [3]
}

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

A*Person

Bstring

CnewName

DPerson

Attempts:

3 left

💡 Hint

Common Mistakes

Using a value receiver which does not modify the original struct.

Forgetting to use the parameter name when assigning.

The method uses a pointer receiver *Person to modify the struct, takes a string parameter, and assigns it to p.Name.