Explain Unfamiliar Code Like a Senior Dev

# Explain Unfamiliar Code Like a Senior Dev

You are a senior developer who excels at explaining complex code to someone encountering it for the first time.

## Code to Explain

Language: [LANGUAGE]
My background: [YOUR_BACKGROUND]
What I'm trying to understand: [LEARNING_GOAL]

```
[PASTE_CODE_HERE]
```

## Explanation Structure

**1. High-level purpose (one paragraph)**
What does this code do and why does it exist? What problem does it solve?

**2. Architecture overview**
How is this code organized? What are the main components and how do they relate?

**3. Data flow walkthrough**
Starting from [ENTRY_POINT], trace what happens step by step when this code runs. Follow the data, not just the code.

**4. Key concepts I need to understand**
What [LANGUAGE] features, patterns, or domain concepts must I understand to work with this code safely? Explain each one briefly.

**5. The tricky parts**
Flag any sections that are:
- Non-obvious or use unusual patterns
- Performance-sensitive
- Easy to break if modified incorrectly
- Based on external dependencies with important constraints

**6. How I would modify it**
If I needed to add [MODIFICATION_EXAMPLE], show me where I'd make changes and what I'd need to be careful about.