ZRANK and ZREVRANK for position in Redis - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to get the rank of member 'alice' in the sorted set 'players'.

Redis

ZRANK players [1]

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

Acharlie

Bbob

Calice

Ddave

Attempts:

3 left

💡 Hint

Common Mistakes

Using a member name that does not exist in the sorted set.

Confusing the sorted set name with the member name.

The ZRANK command returns the rank of the specified member in the sorted set. Here, we want the rank of 'alice'.

2fill in blank

medium

Complete the code to get the reverse rank of member 'bob' in the sorted set 'scores'.

Redis

ZREVRANK scores [1]

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

Abob

Balice

Ccharlie

Ddave

Attempts:

3 left

💡 Hint

Common Mistakes

Using ZRANK instead of ZREVRANK for reverse rank.

Using a member name not present in the sorted set.

The ZREVRANK command returns the rank of the member when the sorted set is ordered from highest to lowest score. Here, we want the reverse rank of 'bob'.

3fill in blank

hard

Fix the error in the code to get the rank of 'charlie' in the sorted set 'leaderboard'.

Redis

ZRANK [1] charlie

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

Aplayers

Bleaderboard

Cscores

Dranking

Attempts:

3 left

💡 Hint

Common Mistakes

Using the wrong sorted set name.

Swapping the member and sorted set arguments.

The first argument to ZRANK is the sorted set name. Here, it should be 'leaderboard' to match the intended sorted set.

4fill in blank

hard

Fill both blanks to get the reverse rank of 'dave' in the sorted set 'game_scores'.

Redis

ZREVRANK [1] [2]

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

Agame_scores

Bdave

Calice

Dplayers

Attempts:

3 left

💡 Hint

Common Mistakes

Swapping the order of sorted set and member.

Using a member not in the sorted set.

The command ZREVRANK requires the sorted set name first, then the member name. Here, 'game_scores' is the sorted set and 'dave' is the member.

5fill in blank

hard

Fill all three blanks to get the rank of 'eve' in the sorted set 'highscores' and then get the reverse rank of 'frank' in the same set.

Redis

ZRANK [1] [2]
ZREVRANK [3] frank

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

Ahighscores

Beve

Dscores

Attempts:

3 left

💡 Hint

Common Mistakes

Using different sorted set names in the two commands.

Mixing up member names.

Both commands use the sorted set name 'highscores'. The first command finds the rank of 'eve', the second finds the reverse rank of 'frank'.