One of the most common techniques used in refactoring code is the Extract Method. The Extract Method technique is a refactoring process that turns a fragment of source code into a method, a procedure, or a function, reducing code duplication and enhancing readability.
The Extract Method technique has a straightforward goal: if you have a section of code within a method that performs a specific task, it should be turned into its own method. This newly formed method then gets a name that describes the task it performs.
Extract Method Refactoring in Java
Let’s start with Java. Assume we have the following code snippet:
If we want to extract the details printing section, we can refactor the code as follows:
Here, the ‘printDetails’ method is created to encapsulate the code responsible for printing the details.
Extract Method Refactoring in Python
Now let’s move on to Python. Given the following function:
We can refactor this using the Extract Method technique like this:
Here, we have created a new function,
print_details, which takes care of printing the name and outstanding amount.
After applying the Extract Method refactoring technique, it can be refactored as follows:
printDetails is the newly created function that encapsulates the task of printing the name and outstanding amount.
Extract Method is a simple yet powerful refactoring technique that can significantly improve the maintainability and readability of your code. Regardless of the programming language, the concept remains the same: If a chunk of code performs a particular task, extract it into a separate function or method. Doing so will not only make your code more readable and maintainable, but it will also make it easier to debug, test, and understand.