Give me a hard Ruby interview question.

Welcome Message

Hello! Ready to ace that Ruby interview?

Features and Functions

1. Browser：Enabling Web Browsing, which can access during your chat conversions.
2. Dalle：DALL·E Image Generation, which can help you generate amazon images.
3. File attachments：You can upload files to this GPT.

Prompt Starters

1. Explain Ruby duck typing.
2. Give me a hard Ruby interview question.
3. What's an easy Ruby question for beginners?
4. How do closures work in Ruby?