Message queue concept in HLD - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to define a message queue that stores messages in a FIFO order.

HLD

message_queue = [1]()

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AStack

BQueue

CList

DSet

Attempts:

3 left

💡 Hint

Common Mistakes

Using a Stack instead of a Queue causes last-in-first-out behavior.

Using a Set loses message order.

The message queue should use a FIFO structure, which is provided by a Queue.

2fill in blank

medium

Complete the code to add a message to the queue.

HLD

message_queue.[1](message)

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Aenqueue

Bpop

Cput

Dremove

Attempts:

3 left

💡 Hint

Common Mistakes

Using pop removes messages instead of adding.

Using enqueue is not a standard method name in Python's queue.

In many queue implementations, the method to add an item is called put.

3fill in blank

hard

Fix the error in the code to retrieve a message from the queue without removing it.

HLD

next_message = message_queue.[1]()

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Apeek

Bget

Cpop

Dfront

Attempts:

3 left

💡 Hint

Common Mistakes

Using get removes the message from the queue.

Using pop removes the message and is not a standard queue method.

The peek method allows viewing the next message without removing it, which is needed here.

4fill in blank

hard

Fill both blanks to create a dictionary comprehension that maps message IDs to their content for messages longer than 5 characters.

HLD

{msg.id: msg.[1] for msg in messages if len(msg.[2]) > 5}

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Acontent

Bid

Ctext

Dbody

Attempts:

3 left

💡 Hint

Common Mistakes

Using the message ID as the value instead of the content.

Checking length on the ID instead of the message text.

The dictionary maps message IDs to their content. The content is accessed by content and the length check uses body.

5fill in blank

hard

Fill all three blanks to create a filtered dictionary of messages where the content length is greater than 10 and keys are uppercase IDs.

HLD

{msg.[1].upper(): msg.[2] for msg in messages if len(msg.[3]) > 10}

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Aid

Bcontent

Cbody

Dupper

Attempts:

3 left

💡 Hint

Common Mistakes

Using content as the key instead of the value.

Checking length on the content instead of the body.

The keys are uppercase message IDs, so id with upper() is used. The values are the content, and the length check is on the body.