Interface definition in Go - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to define an interface named Speaker.

Go

type Speaker [1] {
    Speak() string
}

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

Afunc

Bstruct

Cinterface

Dpackage

Attempts:

3 left

💡 Hint

Common Mistakes

Using struct instead of interface to define an interface.

Forgetting the keyword interface.

The keyword interface is used to define an interface in Go.

2fill in blank

medium

Complete the code to declare a method Speak() that returns a string in the interface.

Go

type Speaker interface {
    [1]() string
}

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

ASpeak

BListen

CSay

DTalk

Attempts:

3 left

💡 Hint

Common Mistakes

Using a different method name than defined in the interface.

Adding parameters to the method when none are required.

The method name in the interface is Speak which returns a string.

3fill in blank

hard

Fix the error in the interface definition by completing the code.

Go

type [1] interface {
    Speak() string
}

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

ASpeaker

Bspeaker

CSpeakers

DSpeak

Attempts:

3 left

💡 Hint

Common Mistakes

Using lowercase names for exported interfaces.

Using method names as interface names.

Interface names in Go are usually capitalized and descriptive. Here, Speaker is the correct name.

4fill in blank

hard

Fill both blanks to define an interface named Reader with a method Read that returns an int and an error.

Go

type [1] interface {
    [2]() (int, error)
}

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

AReader

BWriter

CRead

DWrite

Attempts:

3 left

💡 Hint

Common Mistakes

Mixing interface and method names.

Incorrect method signature.

The interface is named Reader and the method is Read which returns an int and an error.

5fill in blank

hard

Fill all three blanks to define an interface named Writer with a method Write that takes a byte slice and returns an int and an error.

Go

type [1] interface {
    [2]([3] []byte) (int, error)
}

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

AWriter

BWrite

Cdata

DRead

Attempts:

3 left

💡 Hint

Common Mistakes

Using incorrect method or parameter names.

Wrong parameter types.

The interface is Writer, the method is Write, and the parameter name is data which is a byte slice.