[Solved] Analyze the following code snippet:class NotificationSender { send(notification) { notification.deliver();... sender.send(new NullNotification());What will be the result of executing this code? | LLD

LLD - Behavioral Design Patterns — Part 2

Analyze the following code snippet:

class NotificationSender {
  send(notification) { notification.deliver(); }
}
class NullNotification {
  deliver() { /* intentionally empty */ }
}
const sender = new NotificationSender();
sender.send(new NullNotification());

What will be the result of executing this code?

AAn exception is thrown due to calling deliver on NullNotification.

BNo action occurs, and no errors are thrown.

CThe notification is sent with default content.

DThe system logs a warning about null notification.

Step-by-Step Solution

Solution:

Step 1: Understand the Null Object implementation
The NullNotification class implements deliver() with an empty method, meaning it does nothing.
Step 2: Analyze the send method
NotificationSender calls deliver() on the passed notification object. Since NullNotification's deliver() is empty, no action occurs.
Step 3: Check for errors
Because deliver() exists and is callable, no exceptions are thrown.
Final Answer:
No action occurs, and no errors are thrown. -> Option B
Quick Check:
Null Object methods do nothing but prevent errors [OK]

Quick Trick: Null Object methods do nothing but avoid exceptions [OK]

Common Mistakes:

MISTAKES

Assuming Null Object throws exceptions
Expecting default content to be sent
Believing system logs warnings automatically

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More LLD Quizzes

Analyze the following code snippet:

Step 1: Understand the Null Object implementation

Step 2: Analyze the send method

Step 3: Check for errors

Final Answer:

Quick Check:

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