LREM for element removal in Redis - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to remove all occurrences of 'apple' from the list 'fruits'.

Redis

LREM fruits 0 [1]

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

A"apple"

Bapple

C'apple'

Dapple"

Attempts:

3 left

💡 Hint

Common Mistakes

Not using quotes around the element.

Using mismatched or missing quotes.

The LREM command requires the element to be a string enclosed in quotes. Using single quotes around 'apple' is correct.

2fill in blank

medium

Complete the code to remove only the first occurrence of 'banana' from the list 'fruits'.

Redis

LREM fruits [1] "banana"

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

A-1

B0

C2

D1

Attempts:

3 left

💡 Hint

Common Mistakes

Using 0 removes all occurrences, not just the first.

Using negative numbers removes from tail to head.

Using 1 as the count removes the first occurrence of the element.

3fill in blank

hard

Fix the error in the code to remove the last occurrence of 'orange' from the list 'fruits'.

Redis

LREM fruits [1] "orange"

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

A-1

B0

C1

D2

Attempts:

3 left

💡 Hint

Common Mistakes

Using 1 removes the first occurrence, not the last.

Using 0 removes all occurrences.

Using -1 as the count removes the last occurrence of the element from the list.

4fill in blank

hard

Fill both blanks to remove two occurrences of 'grape' starting from the tail in the list 'fruits'.

Redis

LREM fruits [1] [2]

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

A-2

B2

C"grape"

D"apple"

Attempts:

3 left

💡 Hint

Common Mistakes

Using positive count removes from head, not tail.

Using wrong element name.

Count -2 removes two occurrences from tail to head. The element to remove is "grape".

5fill in blank

hard

Fill all three blanks to remove three occurrences of 'melon' starting from the head in the list 'fruits'.

Redis

LREM [1] [2] [3]

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

Afruits

B3

C"melon"

D"banana"

Attempts:

3 left

💡 Hint

Common Mistakes

Using wrong list name.

Using negative count to remove from tail.

Using wrong element name.

The command removes 3 occurrences of "melon" from the list named fruits starting from the head.