How to Refactor Code Using GitHub Copilot

In the realm of modern software development, AI-driven tools like Copilot are indispensable for optimizing code. This article provides insights into Code Refactoring and illustrates how Copilot can be a robust ally in refining your codebase.

Here’s how to set up Copilot for a Python project:

1. In your Integrated Development Environment (IDE), access the Settings.
2. Navigate to the Extensions panel.
3. Use the Marketplace to find the GitHub Copilot extension.
4. Install the extension and restart the IDE upon completion.
5. Post-restart, go to Tools > GitHub Copilot > Login to GitHub.
6. Once signed in, Copilot is activated and ready for use.

While coding, employ these shortcuts to interact with Copilot:

Action	Windows/Linux	MacOS
Trigger inline suggestions	Alt+\	Option+\
Navigate to the next suggestion	Alt+]	Option+]
Return to the previous suggestion	Alt+[	Option+[
Accept a suggestion	Tab	Tab
Dismiss an inline suggestion	Esc	Esc
Open all suggestions in a new tab	Alt+Enter	Alt+Enter

Example 1: Simplifying Complex Code

Consider the following Java method before and after applying Copilot’s refactoring suggestions:

Before Refactoring

public void processOrder(Order order) {
    // ... further codes
    if (order.isReadyForProcessing()) {
        // process the order
    }
    //... further codes
}

After Refactoring with Copilot

public void processOrder(Order order) {
    // ...further codes
    processReadyOrder(order);
    // ...further codes
}

private void processReadyOrder(Order order) {
    if (order.isReadyForProcessing()) {
        // process the order
    }
}

The refactored code introduces a new method, processReadyOrder, enhancing modularity and readability by isolating the order processing logic.

Example 2: Improving Variable Names

Variable names are crucial for code clarity. Here’s how Copilot suggests renaming variables for better understanding:

Before Refactoring

def calculate_area(l, w):
    return l * w

After Refactoring with Copilot

def calculate_area(length, width):
    return length * width

The variables l and w are renamed to length and width, respectively, making the purpose of each variable immediately clear.

While Copilot facilitates code refactoring, it’s essential to review its suggestions critically. Limitations such as occasional incorrect suggestions or the potential for overreliance underscore the importance of a developer’s oversight.