Detect code smells, get safe refactoring plans, and see before/after diffs. Improve code quality without changing behavior.
The Refactor tool analyzes your code for quality issues and provides safe, behavior-preserving improvements:
Identifies long methods, deep nesting, duplicate code, magic numbers, poor naming, and other maintainability issues.
Applies language-specific best practices, SOLID principles, and clean code guidelines from industry standards.
See exactly what changes are proposed with syntax-highlighted, line-by-line comparisons before applying.
All refactoring suggestions preserve behavior. The tool explains why each change is safe and what it improves.
Click the Refactor button (purple icon) or pressCmd/Ctrl + 3.
Enter code that you suspect could be improved. Functions, classes, or modules work best.
Run the analysis. The tool uses high-quality models for architecture and pattern recognition.
Read the improvement suggestions in the Result tab. Each issue includes severity, explanation, and the proposed fix.
Switch to the Diff tab to see a visual comparison of your original code vs. the refactored version.
Click "Apply Changes" to update your code. Use "Revert" if you want to undo.
Here's code with several code smells:
def find_duplicates(items):
"""Find all duplicate items in a list."""
duplicates = []
for i in range(len(items)):
for j in range(i + 1, len(items)):
if items[i] == items[j]:
if items[i] not in duplicates:
duplicates.append(items[i])
return duplicatesThe Refactor tool would identify:
Refactored version:
from collections import Counter
def find_duplicates(items):
"""Find all duplicate items in a list."""
counts = Counter(items)
return [item for item, count in counts.items() if count > 1]| Code Smell | Description |
|---|---|
| Long Method | Functions exceeding 20-30 lines that should be split |
| Deep Nesting | More than 3 levels of indentation |
| Magic Numbers | Hard-coded values that should be named constants |
| Duplicate Code | Similar code blocks that could be extracted |
| Poor Naming | Variables like x, temp, data that lack clarity |
| God Objects | Classes doing too much that should be split |
| Inefficient Algorithms | Code with unnecessary complexity |
Behavior Preservation
Refactoring should never change what your code does, only how it's structured. The tool prioritizes safe transformations and warns about any changes that might affect behavior.