Why sets store unique elements in Redis - Test Your Understanding

Practice - 5 Tasks

1fill in blank

easy

Complete the code to add a member to a Redis set.

Redis

SADD myset [1]

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

ADEL

BGET

Cmember1

DSET

Attempts:

3 left

💡 Hint

Common Mistakes

Using commands like GET or DEL instead of the member name.

Trying to add multiple members without proper syntax.

The SADD command adds a member to a Redis set. Here, member1 is the element to add.

2fill in blank

medium

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

Redis

SISMEMBER myset [1]

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

Amember2

Bmember1

Cmyset

DSADD

Attempts:

3 left

💡 Hint

Common Mistakes

Using the set name instead of the member name.

Using a command name instead of a member.

The SISMEMBER command checks if member1 is in the set myset. It returns 1 if yes, 0 if no.

3fill in blank

hard

Fix the error in the code to add multiple unique members to a Redis set.

Redis

SADD myset [1]

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

Amember1 member2 member3

B"member1,member2,member3"

Cmember1,member2,member3

Dmember1;member2;member3

Attempts:

3 left

💡 Hint

Common Mistakes

Using commas or semicolons to separate members.

Putting all members inside quotes as one string.

To add multiple members, list them separated by spaces without quotes or commas. Option A is correct.

4fill in blank

hard

Fill both blanks to remove a member and then check if it still exists in the set.

Redis

SREM myset [1]
SISMEMBER myset [2]

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

Amember1

Bmember2

Cmember3

Dmyset

Attempts:

3 left

💡 Hint

Common Mistakes

Using different member names in the two commands.

Using the set name instead of a member name.

SREM removes member1 from myset. Then SISMEMBER checks if member1 is still in the set, which should return 0.

5fill in blank

hard

Fill all three blanks to add members, remove one, and check the set size.

Redis

SADD myset [1] [2]
SREM myset [3]
SCARD myset

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

Amember1

Bmember2

Cmember3

Dmember4

Attempts:

3 left

💡 Hint

Common Mistakes

Removing a member that was not added.

Adding the same member twice.

Using the set name instead of member names.

First, member1 and member2 are added to myset. Then member1 is removed. Finally, SCARD returns the number of members left, which should be 1.