Common slice operations in Go - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to create a slice of integers with length 3.

Go

numbers := make([]int, [1])

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

A5

B0

C3

D10

Attempts:

3 left

💡 Hint

Common Mistakes

Using the capacity instead of length.

Confusing length with the initial values.

The make function creates a slice with the specified length. Here, length 3 means the slice has 3 elements.

2fill in blank

medium

Complete the code to append the value 7 to the slice named nums.

Go

nums = append(nums, [1])

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

A0

B7

C5

D10

Attempts:

3 left

💡 Hint

Common Mistakes

Appending a wrong number.

Forgetting to assign the result back to the slice.

The append function adds the given value to the end of the slice. Here, we add 7.

3fill in blank

hard

Fix the error in the code to get the first element of the slice data.

Go

first := data[1]

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

A<0>

B(0)

C{0}

D[0]

Attempts:

3 left

💡 Hint

Common Mistakes

Using parentheses or braces instead of square brackets.

Using an index out of range.

In Go, to access an element of a slice, use square brackets with the index inside, like data[0].

4fill in blank

hard

Fill both blanks to create a new slice sub that contains elements from index 1 to 3 (exclusive) of items.

Go

sub := items[[1]:[2]]

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

A1

B2

C4

D3

Attempts:

3 left

💡 Hint

Common Mistakes

Using the wrong end index that includes unwanted elements.

Confusing inclusive and exclusive indexes.

Slicing in Go uses the syntax slice[start:end]. The slice includes elements from start up to but not including end. To get elements at indexes 1 and 2, use 1 and 3.

5fill in blank

hard

Fill all three blanks to create a map named lengths where keys are words in words slice and values are their lengths, but only for words longer than 3 characters.

Go

lengths := map[string]int{}

for _, word := range words {
    if len(word) [3] 3 {
        lengths[[1]] = [2]
    }
}

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

Aword

Blen(word)

C>

D==

Attempts:

3 left

💡 Hint

Common Mistakes

Using the wrong comparison operator.

Mixing up keys and values in the map.

The map keys are words, so word is the key. The values are lengths, so len(word) is the value. The condition checks if the word length is greater than 3, so use >.