Array slicing in Bash Scripting - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to extract the first three elements from the array.

Bash Scripting

arr=(apple banana cherry date)
slice=(${arr[@]:[1]:3})
echo "${slice[@]}"

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

A2

B1

C0

D3

Attempts:

3 left

💡 Hint

Common Mistakes

Starting the slice at 1 will skip the first element.

Using a length other than 3 will give wrong number of elements.

In bash, array slicing starts at index 0. To get the first three elements, start at 0 and take 3 elements.

2fill in blank

medium

Complete the code to extract elements starting from the second element to the end.

Bash Scripting

arr=(red green blue yellow)
slice=(${arr[@]:[1])
echo "${slice[@]}"

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

A0

B1

C3

D2

Attempts:

3 left

💡 Hint

Common Mistakes

Starting at 0 extracts the whole array.

Starting at 2 skips the second element.

Starting at index 1 extracts elements from the second element to the end.

3fill in blank

hard

Fix the error in the code to correctly slice the array from the third element, taking two elements.

Bash Scripting

arr=(one two three four five)
slice=(${arr[@]:[1]:2})
echo "${slice[@]}"

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

A2

B1

C3

D0

Attempts:

3 left

💡 Hint

Common Mistakes

Using index 3 starts from the fourth element, not third.

Using index 1 starts from the second element.

Index 2 corresponds to the third element in the array, so slicing from 2 with length 2 extracts the third and fourth elements.

4fill in blank

hard

Fill both blanks to slice the array from the second element and take three elements.

Bash Scripting

arr=(cat dog bird fish horse)
slice=(${arr[@]:[1]:[2])
echo "${slice[@]}"

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

A1

B2

C3

D4

Attempts:

3 left

💡 Hint

Common Mistakes

Starting at 2 skips the second element.

Taking 2 elements returns fewer than needed.

Start at index 1 (second element) and take 3 elements to get dog, bird, fish.

5fill in blank

hard

Complete the code to extract the last three elements from the array using a negative index.

Bash Scripting

arr=(apple bat cherry dog elephant fox)
slice=(${arr[@]:[1])
echo "${slice[@]}"

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

A3

B-1

C0

D-3

Attempts:

3 left

💡 Hint

Common Mistakes

Using 3 extracts from index 3 to end, which happens to be the same here, but positive indexes count from the start.

Using 0 extracts the entire array.

Using -1 extracts only the last element.

Using a negative index -3 in the slice extracts the last three elements: dog elephant fox.