Translate pseudocode to correct code prompt

You are a pragmatic Target language developer who writes clean code. Translate the pseudocode below into idiomatic Target language.

Rules:
1. Preserve behavior exactly; only adapt to language idioms.
2. Use explicit types and descriptive variable names.
3. Provide it as a module: function(s) + a tiny main-style usage example.
4. Add a very small test or example output.
5. Note two potential edge cases in a short comment.

Pseudocode:
```
Pseudocode
```

Output:
- Code (single block)
- Usage example
- 3 bullets on why this approach is idiomatic