Package scope rules in Go - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to declare a package named main.

Go

package [1]

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

Amain

Bfmt

Cpackage

Dfunc

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'fmt' as package name instead of 'main'.

Writing 'package' as the package name.

Using 'func' which is a keyword, not a package name.

The package name main is used for executable programs in Go.

2fill in blank

medium

Complete the code to import the fmt package.

Go

import [1]"fmt"

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

A"

B(

C{

D[

Attempts:

3 left

💡 Hint

Common Mistakes

Using quotes directly after import without parentheses.

Using curly braces or square brackets instead of parentheses.

In Go, multiple imports are enclosed in parentheses ( ). Even for one import, parentheses are used for grouping.

3fill in blank

hard

Fix the error in the variable declaration to make it package scoped.

Go

var [1] = 42

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

AmyVar

Bmy_var

C_myVar

DMyVar

Attempts:

3 left

💡 Hint

Common Mistakes

Using lowercase variable names which are not exported.

Using underscores which do not affect scope.

In Go, identifiers starting with a capital letter are exported and have package scope accessible outside the package.

4fill in blank

hard

Fill both blanks to define a package-level function and call it inside main.

Go

func [1]() {
	println("Hello from package scope")
}

func main() {
	[2]()
}

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

AGreet

Bgreet

CPrint

Dprint

Attempts:

3 left

💡 Hint

Common Mistakes

Using lowercase function names which are not exported.

Calling a different function name than defined.

Functions starting with a capital letter are exported and package scoped. The same name is used to define and call the function.

5fill in blank

hard

Fill all three blanks to create a package-level constant, a variable, and a function that uses them.

Go

const [1] = "GoLang"

var [2] = 2024

func [3]() string {
	return [1] + " " + string([2])
}

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

AVersion

Bversion

CGetVersion

DgetVersion

Attempts:

3 left

💡 Hint

Common Mistakes

Using lowercase names which are not exported.

Mismatching names between declaration and usage.

Constants and variables starting with capital letters are exported. The function name starting with a capital letter is also exported and can access these package-level identifiers.