Map use cases in Go - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to declare a map that stores string keys and int values.

Go

var scores map[string][1]

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

Afloat64

Bstring

Cint

Dbool

Attempts:

3 left

💡 Hint

Common Mistakes

Using string as the value type instead of int.

Confusing key and value types.

The map stores string keys and integer values, so the value type is int.

2fill in blank

medium

Complete the code to initialize the map before adding elements.

Go

scores := make(map[string][1])

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

Afloat64

Bstring

Cbool

Dint

Attempts:

3 left

💡 Hint

Common Mistakes

Using string or other types instead of int.

Forgetting to initialize the map before use.

The map values are integers, so make must specify int as the value type.

3fill in blank

hard

Fix the error in the code that adds a new key-value pair to the map.

Go

scores[[1]] = 90

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

A"Alice"

BAlice

C90

Dscore

Attempts:

3 left

💡 Hint

Common Mistakes

Using unquoted string keys.

Using a number or variable name instead of a string literal.

Map keys of type string must be enclosed in double quotes when used as literals.

4fill in blank

hard

Fill both blanks to check if a key exists in the map and print its value.

Go

value, [1] := scores["Bob"]
if [2] {
    fmt.Println("Bob's score:", value)
}

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

Aok

Bexists

Ctrue

Dfound

Attempts:

3 left

💡 Hint

Common Mistakes

Using different variable names in assignment and condition.

Using a string or non-boolean variable in the if condition.

The idiomatic way in Go to check if a key exists is to use the second value, often named ok, which is a boolean.

5fill in blank

hard

Fill all three blanks to declare the words slice, initialize the lengths map, and populate it with lengths for words longer than 3 characters.

Go

[1] := []string{"go", "code", "map", "function"}
[2] := make(map[string][3])
for _, w := range [1] {
    if len(w) > 3 {
        [2][w] = len(w)
    }
}

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

Awords

Blengths

Cint

Dstring

Attempts:

3 left

💡 Hint

Common Mistakes

Swapping slice and map variable names.

Using string instead of int for map values.

BLANK_1 declares the words slice, BLANK_2 the lengths map variable, and BLANK_3 the int value type for storing lengths.