Questions About Code Design

Question 1

It is often said that one of the most important goals in Object-Oriented Design (and code design in general) is to have High Cohesion and Loose Coupling. What does it mean? Why is it that important and how is it achieved?

Question 2

Why do array indexes start with ‘0’ in most languages?

Question 3

How do tests and TDD influence code design?

Question 4

Write a snippet of code violating the Don’t Repeat Yourself (DRY) principle. Then, explain why it is a bad design, and fix it.

Question 5

What’s the difference between cohesion and coupling?

Question 6

What is refactoring useful for?

Question 7

Are comments in code useful? Some say they should be avoided as much as possible, and hopefully made unnecessary. Do you agree?

Question 8

What is the difference between design and architecture?

Question 9

In TDD, why are tests written before code?

Question 10

C++ supports multiple inheritance, and Java allows a class to implement multiple interfaces. What impact does using these facilities have on orthogonality? Is there a difference in impact between using multiple inheritance and multiple interfaces? Is there a difference between using delegation and using inheritance? [This question is from The Pragmatic Programmer, by Andrew Hunt and David Thomas]

Question 11

What are the pros and cons of holding domain logic in Stored Procedures?

Question 12

In your opinion, why has Object-Oriented Design dominated the market for so many years?

Question 13

What would you do to understand if your code has a bad design?