S.O.L.I.D. Questions

Different channels like 'SMSChannel' implement the 'INotificationChannel' interface.

The 'NotificationService' depends on an 'INotificationChannel' interface.

The 'NotificationService' accepts an 'INotificationChannel' in its constructor.

The 'NotificationService' directly instantiates and uses an 'EmailSender' class.

It allows for easier addition of new features without impacting existing ones.

It makes the codebase smaller.

It eliminates the need for testing.

It reduces the need for code documentation.

Execution Speed

Algorithm Efficiency

Memory Optimization

Code Maintainability

Have 'Penguin' inherit 'fly()' and throw an exception, as penguins cannot fly.

Remove the 'fly()' method from the 'Bird' class entirely.

Rethink the inheritance hierarchy. 'Bird' might not be the right superclass for 'Penguin' if flying is a core characteristic.

Have 'Penguin' inherit 'fly()' but leave it empty, as penguins don't need to fly.

It violates the principles of object-oriented programming.

It reduces code reusability.

It makes the code more difficult to unit test.

It can lead to a higher number of interfaces, potentially increasing code complexity.

Create separate interfaces: IEmailService, ISMSService, and ICallService, and have EmailService implement only IEmailService.

Keep the current design, as it provides a single point of access for all communication methods.

Move all methods (sendEmail(), sendSMS(), makeCall()) to the EmailService class.

Throw an exception in EmailService for the unused methods: sendSMS() and makeCall().

It enforces the use of design patterns, making code more readable.

It ensures that all methods have the same name across different classes.

It promotes code reusability, maintainability, and reduces the risk of unexpected bugs when modifying code.

It helps reduce the number of lines of code.

To ensure all methods are open for modification

To prevent modification of existing code

To enforce the use of abstract classes

To allow extending functionality without altering existing code

Interfaces should be small and focused on a single task.

Classes should have only one responsibility.

Code should be open for extension, but closed for modification.

Subtypes should be substitutable for their base types without altering the correctness of the program.

A 'DataProcessor' class depends on an 'IDataSource' interface, not a specific database implementation.

A 'LightSwitch' class is directly dependent on a 'LightBulb' class.

A 'Car' class directly instantiates and uses an 'Engine' class.

A 'Logger' class writes logs directly to a file.