Iterating over arrays in Go - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to print each number in the array.

Go

numbers := [3]int{1, 2, 3}
for [1] := 0; i < len(numbers); i++ {
    fmt.Println(numbers[i])
}

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

Ai

Bj

Cnum

Dindex

Attempts:

3 left

💡 Hint

Common Mistakes

Using a variable name that is not used inside the loop.

Using a variable name that is not declared.

The variable i is commonly used as the index in for loops. Here, it iterates from 0 to the length of the array.

2fill in blank

medium

Complete the code to use a range loop to print each element in the array.

Go

numbers := [3]int{4, 5, 6}
for [1], value := range numbers {
    fmt.Println(value)
}

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

Aindex

Bi

C_

Dval

Attempts:

3 left

💡 Hint

Common Mistakes

Using a variable name that is not declared.

Trying to use only one variable without the index.

The variable i is commonly used as the index in range loops. It is ignored here but must be declared.

3fill in blank

hard

Fix the error in the for loop to correctly iterate over the array.

Go

arr := [3]string{"a", "b", "c"}
for i := 0; i <= len(arr); i++ {
    fmt.Println(arr[[1]])
}

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

A0

Bi-1

Ci+1

Di

Attempts:

3 left

💡 Hint

Common Mistakes

Using <= in the loop condition causing index out of range.

Using incorrect index inside the loop.

The loop should use i as the index. The condition should be i < len(arr) to avoid out-of-range errors.

4fill in blank

hard

Fill both blanks to create a map of words and their lengths for words longer than 3 characters.

Go

words := []string{"go", "code", "fun", "learn"}
lengths := map[string]int{word: [1] for _, word := range words if [2]

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Alen(word)

Bword

Clen(word) > 3

Dword == "go"

Attempts:

3 left

💡 Hint

Common Mistakes

Using the word itself instead of its length.

Using the wrong condition to filter words.

The map stores the length of each word. The condition filters words longer than 3 characters.

5fill in blank

hard

Fill all three blanks to create a map of uppercase words and their lengths for words with length greater than 2.

Go

words := []string{"go", "code", "fun", "learn"}
lengths := map[string]int[1]: [2] for _, word := range words if [3]

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Astrings.ToUpper(word)

Blen(word)

Clen(word) > 2

Dword

Attempts:

3 left

💡 Hint

Common Mistakes

Not converting words to uppercase for keys.

Using wrong length condition.

Mixing up keys and values in the map.

The map keys are uppercase words, values are their lengths, filtered by length greater than 2.