Adding and updating values in Go - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to add a new key-value pair to the map.

Go

package main

import "fmt"

func main() {
	ages := map[string]int{"Alice": 30}
	ages["Bob"] = [1]
	fmt.Println(ages)
}

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

Aage

B"25"

C25

Dnil

Attempts:

3 left

💡 Hint

Common Mistakes

Using a string value instead of an integer.

Using an undefined variable.

The value for the map key must be an integer. Here, 25 is the correct integer to add.

2fill in blank

medium

Complete the code to update the value for the key "Alice" in the map.

Go

package main

import "fmt"

func main() {
	ages := map[string]int{"Alice": 30, "Bob": 25}
	ages["Alice"] = [1]
	fmt.Println(ages)
}

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

Aage

B35

C"35"

Dnil

Attempts:

3 left

💡 Hint

Common Mistakes

Using a string instead of an integer.

Trying to update a key that does not exist.

To update the value for "Alice", assign a new integer value like 35.

3fill in blank

hard

Fix the error in the code by completing the blank to add a new key-value pair.

Go

package main

import "fmt"

func main() {
	ages := map[string]int{"Alice": 30}
	ages[[1]] = 40
	fmt.Println(ages)
}

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

A"Bob"

BBob

C40

Dage

Attempts:

3 left

💡 Hint

Common Mistakes

Using an unquoted string as a key.

Using a value instead of a key.

Map keys of type string must be enclosed in quotes when used as literals. "Bob" is correct.

4fill in blank

hard

Fill both blanks to add a new key-value pair and update an existing one.

Go

package main

import "fmt"

func main() {
	ages := map[string]int{"Alice": 30, "Bob": 25}
	ages[[1]] = 40
	ages[[2]] = 35
	fmt.Println(ages)
}

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

A"Charlie"

B"Alice"

C"Bob"

D"David"

Attempts:

3 left

💡 Hint

Common Mistakes

Using keys without quotes.

Trying to update a key that does not exist.

"Charlie" is a new key to add, and "Bob" is an existing key to update.

5fill in blank

hard

Fill all three blanks to add a new key-value pair, update an existing one, and print a value from the updated map.

Go

package main

import "fmt"

func main() {
	ages := map[string]int{"Alice": 30, "Bob": 25}
	ages[[1]] = 40
	ages[[2]] = 35
	fmt.Println(ages[[3]])
}

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

A"Charlie"

B"Bob"

C"Alice"

D"David"

Attempts:

3 left

💡 Hint

Common Mistakes

Using keys without quotes.

Printing a key that was not added or updated.

"Charlie" is added with 40, "Alice" is updated to 35, and the value for "Bob" is printed.