Notification to all parties in LLD - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to send a notification to all users.

LLD

for user in users:
    user.[1](message)

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

Aalert

Bnotify

Csend

Dmessage

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'send' which is too generic and may not exist in the user object.

Using 'alert' which is not the method defined for notifications.

The method notify is used to send notifications to users in this system.

2fill in blank

medium

Complete the code to add a notification to the queue for asynchronous processing.

LLD

notification_queue.[1](notification)

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

Aremove

Bpop

Cdequeue

Denqueue

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'pop' which removes an item instead of adding.

Using 'dequeue' which removes an item from the queue.

The enqueue method adds an item to the queue for later processing.

3fill in blank

hard

Fix the error in the notification dispatch function to correctly handle failures.

LLD

try:
    dispatcher.[1](notification)
except Exception as e:
    logger.error(str(e))

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

Adispatch

Bsend

Cnotify

Dsend_notification

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'send' which may not exist in dispatcher.

Using 'notify' which is a user method, not dispatcher.

The correct method to send notifications in the dispatcher is dispatch.

4fill in blank

hard

Fill both blanks to filter notifications and send only urgent ones.

LLD

urgent_notifications = [n for n in notifications if n.[1] [2] 'urgent']
for notification in urgent_notifications:
    notification.send()

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

Apriority

B==

C!=

Dstatus

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'status' instead of 'priority' for filtering.

Using '!=' which filters out urgent notifications.

We filter notifications where the priority is equal (==) to 'urgent'.

5fill in blank

hard

Fill all three blanks to create a dictionary of user IDs and their last notification timestamps, filtering only active users.

LLD

last_notifications = {user.[1]: user.notifications[-1].[2] for user in users if user.[3]

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

Aid

Btimestamp

Cis_active

Dname

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'name' instead of 'id' as dictionary key.

Using 'status' or other attributes instead of 'is_active' for filtering.

We use id as the key, timestamp of the last notification as the value, and filter users where is_active is true.