Accessing array elements in Go - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to print the first element of the array.

Go

package main
import "fmt"
func main() {
    arr := [3]int{10, 20, 30}
    fmt.Println(arr[[1]])
}

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

A(0)

B<0>

C{0}

D0

Attempts:

3 left

💡 Hint

Common Mistakes

Using parentheses or curly braces instead of square brackets.

Using an index starting at 1 instead of 0.

The correct way to access an element in a Go array is by using square brackets with the index inside, like arr[0].

2fill in blank

medium

Complete the code to print the last element of the array.

Go

package main
import "fmt"
func main() {
    arr := [4]string{"a", "b", "c", "d"}
    fmt.Println(arr[[1]])
}

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

A3

B4

C0

D-1

Attempts:

3 left

💡 Hint

Common Mistakes

Using index 4 which is out of range.

Using negative indexes which Go does not support.

The last element of an array with 4 elements is at index 3, since indexing starts at 0.

3fill in blank

hard

Fix the error in the code to correctly access the second element of the array.

Go

package main
import "fmt"
func main() {
    nums := [5]int{1, 2, 3, 4, 5}
    fmt.Println(nums[[1]])
}

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

A<1>

B(1)

C1

D{1}

Attempts:

3 left

💡 Hint

Common Mistakes

Using parentheses or curly braces instead of square brackets.

Using index 2 instead of 1 for the second element.

Array elements in Go are accessed using square brackets with the index inside, so nums[1] accesses the second element.

4fill in blank

hard

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

Go

package main
import "fmt"
func main() {
    words := []string{"go", "code", "play", "fun"}
    lengths := map[string]int{
        [1]: [2],
    }
    fmt.Println(lengths)
}

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

A"code"

Blen("code")

C"go"

Dlen("go")

Attempts:

3 left

💡 Hint

Common Mistakes

Using the wrong word as key.

Not using the len function for the value.

The map key should be the word "code" and the value should be its length using len("code").

5fill in blank

hard

Fill all three blanks to create a map of uppercase words to their lengths for words longer than 2 characters.

Go

package main
import (
    "fmt"
    "strings"
)
func main() {
    words := []string{"go", "code", "play", "fun"}
    lengths := map[string]int{
        [1]: [2],
        [3]: len("play"),
    }
    fmt.Println(lengths)
}

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

Astrings.ToUpper("code")

Blen("code")

Cstrings.ToUpper("play")

Dlen("play")

Attempts:

3 left

💡 Hint

Common Mistakes

Not using strings.ToUpper for keys.

Mixing up keys and values.

The map keys are uppercase words using strings.ToUpper, and the values are their lengths using len.