DRY (Don't Repeat Yourself) in Software Engineering - Cheat Sheet & Quick Revision

Recall & Review

beginner

What does DRY stand for in software engineering?

DRY stands for "Don't Repeat Yourself". It is a principle aimed at reducing repetition of code or information.

beginner

Why is following the DRY principle important?

Following DRY helps make code easier to maintain, reduces errors, and saves time by avoiding duplicate work.

beginner

Give a simple example of violating the DRY principle.

Writing the same calculation or logic multiple times in different parts of a program instead of using a single function.

beginner

How can you apply the DRY principle in programming?

You can apply DRY by creating reusable functions, modules, or components that handle repeated tasks or data.

intermediate

What problems can arise if you ignore the DRY principle?

Ignoring DRY can cause bugs to spread, make updates harder, and increase the chance of inconsistent behavior.

What is the main goal of the DRY principle?

A To avoid repeating code or information

B To write code as fast as possible

C To use more comments in code

D To make code run faster

The DRY principle focuses on avoiding repetition to improve maintainability and reduce errors.

Which of the following is a good way to follow DRY?

A Copy-pasting code blocks multiple times

B Writing the same logic in different files

C Ignoring code duplication

D Writing reusable functions

Reusable functions help avoid repeating the same code, which follows the DRY principle.

What can happen if you repeat code in many places?

A It becomes easier to fix bugs

B It reduces the size of the codebase

C It increases the chance of inconsistent updates

D It improves code readability

Repeating code can cause inconsistent updates and bugs because changes must be made in many places.

Which of these is NOT a benefit of DRY?

A More bugs

B Less code duplication

C Easier maintenance

D Better readability

DRY reduces bugs by avoiding repeated code, so 'More bugs' is not a benefit.

DRY is most closely related to which software quality?

A Performance

B Maintainability

C Security

D User interface design

DRY improves maintainability by making code easier to update and manage.

Explain the DRY principle and why it matters in software development.

Think about how repeating code can cause problems.

Describe a real-life example where applying DRY can improve a project.

Consider tasks you do multiple times that could be done once.