11.9. Object-Oriented Design Patterns

Try these first

1. 1.

   What is a design pattern?

   Hint

   Think about recurrent issues in programming.

2. 2.

   Name one creational design pattern.

   Hint

   Focus on object creation.

3. 3.

   What is the primary purpose of design patterns?

   • To enforce coding standards
   • To provide reusable solutions to design problems
   • To improve performance

   Hint

   Think about patterns as solutions.

4. 4.

   The Builder pattern is used for:

   • True
   • False

   Hint

   Consider how you build things step-by-step.

5. 5.

   Implement a simple program using both Singleton and Observer patterns. Describe their interaction.

   Hint

   How would observers receive updates from the Singleton?

6. 6.

   Design a lightweight document editor using the Command pattern to handle user actions like cut, copy, and paste. Explain the flow.

   Hint

   Think about how you store commands and execute them later.