Pattern Finding

Pattern Finding

Find existing implementations in the codebase before writing new code.

Process

1. Identify key terms from the task description
2. Search for similar code using Glob/​Grep
3. Analyze the patterns used in existing implementations
4. Document findings for implementation

Search Strategies

By Feature Name

# Find files related to player movement
Glob("**/​*movement*")
Glob("**/​*player*")

# Search for specific patterns
Grep("function.*movement", "src/")

By File Type

# Find React components
Glob("src/​components/​**/​*.tsx")

# Find hooks
Glob("**/​hooks/​*.ts")

By Pattern

# Find useState patterns
Grep("useState.*THREE", "src/")

# Find useEffect cleanup
Grep("useEffect.*return.*cleanup", "src/")

What to Look For

• Import patterns - How are modules imported?
• Component structure - Functional vs class, hooks used
• State management - Zustand stores, contexts
• API patterns - How are API calls made?
• Error handling - Try/​catch patterns
• File organization - Where does code belong?

Output Format

Document findings as:

## Pattern: {pattern name}

Found in: {file paths}

Usage: {how it's used}

Key elements:
- {element 1}
- {element 2}

Anti-Patterns

❌ DON'T:

• Search too broadly - Grep("function") returns too many results
• Skip reading context - Copying code without understanding causes bugs
• Assume patterns are correct - Existing code may have technical debt
• Ignore test files - Tests often show how code is meant to be used
• Search only one way - Combine Glob + Grep for best results

✅ DO:

• Use specific search terms - Grep("function.*movement", "src/​components/")
• Read multiple examples - Find the common pattern across implementations
• Check test files - Tests reveal intended usage patterns
• Verify patterns work - Don't copy broken or outdated code
• Document findings - Write down patterns for reference during implementation