Set vs sorted set for membership in Redis - Interactive Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to check if a member exists in a Redis set.

Redis

EXISTS = redis.sismember('myset', [1])

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

A'member1'

B'sortedset'

C'zadd'

D'score'

Attempts:

3 left

💡 Hint

Common Mistakes

Using sorted set commands like ZADD instead of set commands.

Not quoting the member name as a string.

Use sismember with the set name and the member to check membership.

2fill in blank

medium

Complete the code to add a member with a score to a Redis sorted set.

Redis

redis.[1]('myzset', 10, 'member1')

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

Asadd

Bzadd

Czrange

Dsmembers

Attempts:

3 left

💡 Hint

Common Mistakes

Using sadd which does not accept scores.

Using smembers which lists members but does not add.

Use zadd to add a member with a score to a sorted set.

3fill in blank

hard

Fix the error in the code to check membership in a sorted set.

Redis

exists = redis.[1]('myzset', 'member1')

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

Asismember

Bzrem

Czrank

Dzscore

Attempts:

3 left

💡 Hint

Common Mistakes

Using sismember which only works for sets, not sorted sets.

Using zrem which removes members instead of checking.

To check if a member exists in a sorted set, use zscore. It returns the score if the member exists, or None if not.

4fill in blank

hard

Fill both blanks to create a Redis set and add a member.

Redis

redis.[1]('myset')
redis.[2]('myset', 'member1')

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

Adelete

Bsadd

Czadd

Dexists

Attempts:

3 left

💡 Hint

Common Mistakes

Using zadd which is for sorted sets, not sets.

Trying to add members before deleting existing keys.

First, delete any existing set with delete to start fresh, then add a member with sadd.

5fill in blank

hard

Fill all three blanks to check membership in a set and a sorted set.

Redis

is_in_set = redis.[1]('myset', 'member1')
is_in_zset = redis.[2]('myzset', 'member1') is not None
redis.[3]('myzset', 5, 'member2')

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

Asismember

Bzscore

Czadd

Dsmembers

Attempts:

3 left

💡 Hint

Common Mistakes

Using sismember for sorted sets.

Using smembers to check membership instead of sismember.

Use sismember to check membership in a set, zscore to check membership in a sorted set, and zadd to add a member with a score to a sorted set.