LINDEX for position access in Redis - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to get the element at index 2 from the list 'mylist'.

Redis

LINDEX mylist [1]

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

A2

B1

C3

D-1

Attempts:

3 left

💡 Hint

Common Mistakes

Using index 1 instead of 2, which returns the second element.

Using negative index when positive index is needed.

The LINDEX command retrieves the element at the specified index. Indexing starts at 0, so index 2 is the third element.

2fill in blank

medium

Complete the code to get the last element from the list 'tasks'.

Redis

LINDEX tasks [1]

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

A-1

B0

C1

D-2

Attempts:

3 left

💡 Hint

Common Mistakes

Using 0 which returns the first element instead of the last.

Using -2 which returns the second last element.

Using index -1 with LINDEX returns the last element of the list.

3fill in blank

hard

Fix the error in the code to correctly get the first element of the list 'queue'.

Redis

LINDEX queue [1]

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

A1

B2

C-1

D0

Attempts:

3 left

💡 Hint

Common Mistakes

Using 1 which returns the second element.

Using -1 which returns the last element.

The first element in a Redis list is at index 0. Using any other index will not return the first element.

4fill in blank

hard

Fill both blanks to get the element at index 3 from the list 'events' and the element at index -2 from the list 'logs'.

Redis

LINDEX events [1]
LINDEX logs [2]

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

A3

B-1

C-2

D2

Attempts:

3 left

💡 Hint

Common Mistakes

Using -1 instead of -2 for the second last element.

Using 2 instead of 3 for the fourth element.

Index 3 gets the fourth element from 'events'. Index -2 gets the second last element from 'logs'.

5fill in blank

hard

Fill all three blanks to get the first element from 'list1', the last element from 'list2', and the element at index 4 from 'list3'.

Redis

LINDEX list1 [1]
LINDEX list2 [2]
LINDEX list3 [3]

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

A0

B-1

C4

D1

Attempts:

3 left

💡 Hint

Common Mistakes

Using 1 instead of 0 for the first element.

Using 0 instead of -1 for the last element.

Using 5 instead of 4 for the fifth element.

Index 0 gets the first element, -1 gets the last element, and 4 gets the fifth element (indexing starts at 0).