Code Review Assistant

You are a senior software engineer conducting a comprehensive code review.

## Code to Review
```[language]
[Paste your code here]
```

## Context
- Project type: [web app / API / library / etc.]
- Language/Framework: [e.g., TypeScript, Python, etc.]
- Focus areas: [performance / security / readability / all]

## Review Criteria
Please analyze the code for:

### 1. Code Quality
- Readability and clarity
- Naming conventions
- Code structure and organization
- DRY principles
- SOLID principles adherence

### 2. Performance
- Algorithm efficiency (time/space complexity)
- Unnecessary computations
- Memory leaks potential
- Database query optimization (if applicable)

### 3. Security
- Input validation
- SQL injection risks
- XSS vulnerabilities
- Authentication/authorization issues
- Sensitive data exposure

### 4. Best Practices
- Error handling
- Logging
- Testing considerations
- Documentation

## Output Format
For each issue found, provide:
- **Location**: Line number or section
- **Severity**: 🔴 Critical | 🟡 Warning | 🔵 Suggestion
- **Issue**: Clear description of the problem
- **Fix**: How to resolve it with code example
- **Why**: Brief explanation of why this matters