CAD Code Refactoring and Quality 3

Question 1

A developer notices that several classes all pass the same three parameters together in multiple method calls. Which refactoring should be applied?

Accepted Answer

Introduce Parameter Object

Answer

Introduce Parameter Object groups related parameters that always travel together into a single object, reducing parameter list length.

Question 2

What does the SOLID principle 'D' (Dependency Inversion) state?

Accepted Answer

High-level modules should not depend on low-level modules; both should depend on abstractions

Answer

Dependency Inversion Principle states high-level modules and low-level modules should both depend on abstractions, not on each other directly.

Question 3

Which refactoring technique is best when a method is used more often in another class than in its own class?

Accepted Answer

Move Method

Answer

Move Method relocates a method to the class that uses it most, reducing Feature Envy and improving cohesion.

Question 4

In agile development, what is a 'code smell' in a production codebase?

Accepted Answer

A surface indication that usually corresponds to a deeper problem in the code

Answer

A code smell is a symptom in code that suggests a possible deeper design problem worth investigating and refactoring.

Question 5

What is the goal of 'Replace Magic Number with Symbolic Constant' refactoring?

Accepted Answer

Replace unexplained literal values with named constants that express intent

Answer

This refactoring replaces hard-coded literal numbers with named constants, making code self-documenting and easier to maintain.

(CAD) Certified Agile Developer Practice Test