XLEN for stream length in Redis - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to get the length of a Redis stream named 'mystream'.

Redis

XLEN [1]

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

Amystream

Bmylist

Cmyhash

Dmyset

Attempts:

3 left

💡 Hint

Common Mistakes

Using a non-stream key like a list or hash name.

Forgetting to provide the stream name after XLEN.

The XLEN command returns the number of entries in the specified stream. Here, the stream name is mystream.

2fill in blank

medium

Complete the code to get the length of a Redis stream stored in the variable 'stream_key'.

Redis

XLEN [1]

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

Astream_key

B'stream_key'

CstreamKey

DSTREAM_KEY

Attempts:

3 left

💡 Hint

Common Mistakes

Adding quotes around the variable name, making it a string literal.

Using uppercase or camelCase when the variable is lowercase.

When using a variable name in Redis CLI or scripts, use it directly without quotes. Here, stream_key is the variable holding the stream name.

3fill in blank

hard

Fix the error in the command to get the length of the stream 'events'.

Redis

XLEN [1]

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

Aevents_stream

Bevents

C'events'

Devent

Attempts:

3 left

💡 Hint

Common Mistakes

Adding quotes around the stream name.

Using a wrong or incomplete stream name.

The correct stream name is events without quotes. Using quotes causes a syntax error in Redis CLI.

4fill in blank

hard

Fill both blanks to get the length of the stream stored in variable 'streamName' and store it in variable 'length'.

Redis

length = [1] [2]

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

AXLEN

BstreamName

Cmystream

DGET

Attempts:

3 left

💡 Hint

Common Mistakes

Using GET instead of XLEN.

Using a hardcoded stream name instead of the variable.

Use XLEN followed by the stream variable streamName to get the stream length.

5fill in blank

hard

Fill all three blanks to get the length of the stream 'orders', check if it is greater than 100, and store the result in 'isLarge'.

Redis

length = [1] [2]
isLarge = length [3] 100

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

AXLEN

Borders

C>

D<

Attempts:

3 left

💡 Hint

Common Mistakes

Using the wrong comparison operator.

Using a wrong stream name.

First, use XLEN orders to get the stream length. Then compare if length is greater than 100 using >.