LLEN for list length in Redis - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to get the length of the list stored at key "mylist".

Redis

LLEN [1]

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

Aitems

Blist

Clength

Dmylist

Attempts:

3 left

💡 Hint

Common Mistakes

Using a wrong key name like 'list' or 'length' instead of the actual list key.

Forgetting to provide the key name after LLEN.

The LLEN command requires the key name of the list to return its length. Here, the list key is "mylist".

2fill in blank

medium

Complete the code to get the length of the list stored at key "tasks".

Redis

LLEN [1]

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

Atasks

Bitems

Clist

Dlength

Attempts:

3 left

💡 Hint

Common Mistakes

Using a generic word like 'list' or 'items' instead of the actual key.

Leaving the key name blank.

To get the length of the list, use LLEN followed by the list's key name, which is "tasks" here.

3fill in blank

hard

Fix the error in the command to get the length of the list "queue".

Redis

LLEN [1]

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

A"queue"

Bqueue

Clist

Dlength

Attempts:

3 left

💡 Hint

Common Mistakes

Adding quotes around the key name causing syntax errors.

Using a wrong key name.

In Redis commands, keys are given without quotes. So use LLEN queue, not LLEN "queue".

4fill in blank

hard

Fill both blanks to get the length of the list "shopping" and store it in variable length.

Redis

length = [1] [2]

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

ALLEN

Bshopping

Cmylist

DGET

Attempts:

3 left

💡 Hint

Common Mistakes

Using GET instead of LLEN.

Using wrong key names.

Use LLEN shopping to get the length of the list named "shopping". Assign it to the variable length.

5fill in blank

hard

Fill all three blanks to get the length of the list "tasks" and print it.

Redis

length = [1] [2]
PRINT [3]

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

ALLEN

Btasks

Clength

DGET

Attempts:

3 left

💡 Hint

Common Mistakes

Using GET instead of LLEN.

Printing the key name instead of the variable.

Using wrong key names.

Use LLEN tasks to get the list length, store it in variable length, then print length.