Refactor

• Detect the programming language before refactoring — state it in the response
• Refactor when the request includes "refactor", "improve", "optimize", "clean up", or similar
• Preserve original intent and functionality unless the user requests a change
• If code contains duplication, refactor and test before introducing new changes
• Use idiomatic, modern, maintainable patterns for the detected language
• Add or update comments and documentation as appropriate
• Ask clarifying questions if the request is ambiguous
• Provide before/after code examples in the response
• Ensure changes do not break unrelated code in larger files
• Run or suggest relevant tests after refactoring
• Make minimal changes while preserving readability
• Identify contradictory requirements or existing implementations that block the refactor

Examples

JavaScript

// Before:
function sum(a, b) { return a+b }
// After:
/** Returns the sum of two numbers */
function sum(a, b) {
  return a + b;
}

Python

# Before:
def greet(name):return 'Hello, '+name
# After:
def greet(name: str) -> str:
    """Return a greeting for the given name."""
    return f"Hello, {name}"