Accessing map values in Go - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to access the value for key "name" in the map.

Go

person := map[string]string{"name": "Alice", "city": "Paris"}
value := person[[1]]
fmt.Println(value)

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

A"name"

B"age"

Cname

D"city"

Attempts:

3 left

💡 Hint

Common Mistakes

Forgetting to put quotes around the key string.

Using a variable name without quotes.

To access a value in a map by key, use the key as a string inside square brackets. Here, the key is "name".

2fill in blank

medium

Complete the code to check if the key "age" exists in the map.

Go

person := map[string]int{"age": 30, "score": 100}
value, [1] := person["age"]
if ok {
    fmt.Println("Age is", value)
} else {
    fmt.Println("Age not found")
}

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

Aok

Bexists

Cfound

Dpresent

Attempts:

3 left

💡 Hint

Common Mistakes

Using a variable name not matching the if condition.

Not using the second value to check existence.

In Go, the second value when accessing a map is usually assigned to a variable named 'ok' by convention to check if the key exists.

3fill in blank

hard

Fix the error in accessing the map value safely.

Go

scores := map[string]int{"math": 90, "english": 85}
score, [1] := scores["science"]
if ok {
    fmt.Println("Science score:", score)
} else {
    fmt.Println("Science score not found")
}

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

Afound

Bok

Cexists

Dpresent

Attempts:

3 left

💡 Hint

Common Mistakes

Using a variable name different from the one in the if condition.

Not assigning the second value from the map access.

The idiomatic variable name to check if a key exists in a map is 'ok'.

4fill in blank

hard

Fill both blanks to create a map of string to int and access the value for key "apples".

Go

inventory := map[string]int[1]: 5, "oranges": 10}
count := inventory[[2]]
fmt.Println(count)

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

A"apples"

B"bananas"

D"oranges"

Attempts:

3 left

💡 Hint

Common Mistakes

Using different keys for map creation and access.

Forgetting quotes around the key strings.

The map key "apples" must be used both when creating the map and when accessing its value.

5fill in blank

hard

Fill all three blanks to safely access a map value and print a message if the key "color" exists.

Go

attributes := map[string]string{"color": "blue", "size": "medium"}
value, [1] := attributes[[2]]
if [3] {
    fmt.Println("Color is", value)
} else {
    fmt.Println("Color not found")
}

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

Aok

B"color"

Dfound

Attempts:

3 left

💡 Hint

Common Mistakes

Using different variable names for the existence check.

Not using quotes around the key string.

Using a variable in the if condition that was not assigned.

Use 'ok' to check if the key exists, the key string "color" to access the map, and the same 'ok' variable in the if condition.