ZRANGE and ZREVRANGE for reading in Redis - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to get the first 3 elements from a sorted set named 'myzset'.

Redis

ZRANGE myzset 0 [1]

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

A2

B3

C-1

D1

Attempts:

3 left

💡 Hint

Common Mistakes

Using 3 as the end index returns 4 elements instead of 3.

Using negative indices without understanding their meaning.

The command ZRANGE myzset 0 2 returns the first 3 elements because the range is inclusive and zero-based.

2fill in blank

medium

Complete the code to get the last 2 elements from a sorted set named 'myzset' using ZREVRANGE.

Redis

ZREVRANGE myzset [1] -1

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

A0

B-2

C-1

D1

Attempts:

3 left

💡 Hint

Common Mistakes

Using 0 as the start index returns elements from the beginning, not the end.

Using -1 as the start index returns only the last element.

The command ZREVRANGE myzset -2 -1 returns the last 2 elements in reverse order.

3fill in blank

hard

Fix the error in the command to get elements from index 1 to 3 in 'myzset'.

Redis

ZRANGE myzset [1] 3

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

A1

B0

C2

D-3

Attempts:

3 left

💡 Hint

Common Mistakes

Using 0 as the start index returns elements from index 0, not 1.

Using negative indices incorrectly.

The correct start index is 1 to get elements from index 1 to 3 inclusive.

4fill in blank

hard

Fill both blanks to get elements from index 2 to 4 in reverse order from 'myzset'.

Redis

ZREVRANGE myzset [1] [2]

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

A4

B2

C0

D-1

Attempts:

3 left

💡 Hint

Common Mistakes

Swapping start and end indices incorrectly.

Using negative indices without understanding their effect.

Using ZREVRANGE myzset 2 4 returns elements from index 2 to 4 in reverse order.

5fill in blank

hard

Fill all three blanks to get elements from index 1 to 3 with scores included from 'myzset'.

Redis

ZRANGE myzset [1] [2] [3]

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

A0

B1

CWITHSCORES

D3

Attempts:

3 left

💡 Hint

Common Mistakes

Placing WITHSCORES before indices.

Using incorrect indices that do not match the desired range.

The command ZRANGE myzset 1 3 WITHSCORES returns elements from index 1 to 3 along with their scores.