Iterating over maps in Go - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to iterate over the map and print keys.

Go

for [1] := range myMap {
    fmt.Println([1])
}

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

Aindex

Bkey

Citem

Dvalue

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'value' instead of 'key' for the first variable.

Using variable names that don't represent keys.

In Go, when iterating over a map, the first variable is the key.

2fill in blank

medium

Complete the code to iterate over the map and print keys and values.

Go

for [1], value := range myMap {
    fmt.Println([1], value)
}

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

Akey

Bval

Citem

Dindex

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'val' or 'value' as the first variable instead of the key.

Using the same variable name for both key and value.

The first variable in the range loop is the key, which we name 'key' here.

3fill in blank

hard

Fix the error in the code to correctly iterate over the map and print keys and values.

Go

for key, [1] := range myMap {
    fmt.Println(key, [1])
}

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

Akey

Bitem

Cvalue

Dindex

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'key' for both variables.

Using variable names that don't represent values.

The second variable in the range loop is the value, so use 'value'.

4fill in blank

hard

Fill both blanks to create a map comprehension that stores lengths of keys longer than 3 characters.

Go

lengths := map[string]int{}
for [1], [2] := range myMap {
    if len([1]) > 3 {
        lengths[[1]] = len([1])
    }
}

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

Akey

Bvalue

Citem

Dindex

Attempts:

3 left

💡 Hint

Common Mistakes

Using the same variable for both blanks.

Using 'item' or 'index' which are not typical for maps.

Use 'key' and 'value' to iterate over the map. The key is used to check length and store in the new map.

5fill in blank

hard

Fill all three blanks to create a map that stores uppercase keys with their values if the value is greater than 10.

Go

filtered := map[string]int{}
for [1], [2] := range myMap {
    if [2] > 10 {
        filtered[strings.ToUpper([1])] = [2]
    }
}

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

Akey

Bvalue

Cval

Ditem

Attempts:

3 left

💡 Hint

Common Mistakes

Using different variable names inconsistently.

Using the key variable where the value is needed.

Use 'key' and 'value' to iterate. Check if value > 10, then store with uppercase key and value.