User-defined functions can offer several advantages when used in your code:

1. Code Reusability: One of the main advantages of user-defined functions is that they allow you to reuse code easily. This can save you time and effort, as you can define a function once and then call it from multiple places in your code, rather than writing the same code multiple times. This can also make your code more efficient, as it reduces the need for repetitive or redundant code.
2. Code Organization: User-defined functions can help to organize your code, especially if you have a large or complex project. By dividing your code into smaller, self-contained functions, you can make it easier to understand and work with. This can also make it easier to test and debug your code, as you can focus on individual functions rather than trying to understand the entire codebase at once.
3. Maintainability: User-defined functions can make your code more maintainable by allowing you to modify or update specific parts of your code without affecting the rest of the codebase. This can be especially useful if you are working on a large project with multiple developers, as it can help to prevent conflicts and ensure that everyone is working with the most up-to-date code.
4. Code Readability: Using user-defined functions can make your code more readable and easier to understand, especially if you use descriptive function names and well-structured code. This can be especially helpful when working with other developers or when you need to come back to your code after a long break.

Overall, user-defined functions can be a useful tool for organizing, reusing, and maintaining your code. By taking advantage of these benefits, you can write more efficient, maintainable, and readable code, which can save you time and effort in the long run.