What is meant by 'code refactoring'?

• A. Rewriting the entire code from scratch
• B. Modifying code to improve its structure without changing its functionality
• C. Converting code from one programming language to another
• D. Removing comments and unnecessary text from code

Answer: (B)

Code refactoring is the process of modifying existing code with the aim of improving its structure and readability while ensuring that its functionality remains unchanged. This can involve simplifying complex code, organizing it into more understandable components, and enhancing the overall code quality without introducing any new features or altering the intended operations of the code.

This practice is important because it helps in maintaining the software over time. As codebases grow and evolve, they can become difficult to understand and manage. Refactoring allows developers to optimize the code for performance, reduce technical debt, and improve the clarity for future developers or team members who may work on it.

The other options do not accurately reflect the concept of code refactoring. Rewriting code from scratch suggests starting anew, which is fundamentally different from improving the existing structure without changing functionality. Converting code from one programming language to another involves a complete transformation, which is not what refactoring entails. Lastly, while removing comments and unnecessary text might tidy up the code, it doesn't address the structural integrity and overall design of the code itself. Therefore, the essence of refactoring is centered on enhancing the existing code without altering what it does.