Entities and value objects

Why it matters

Explain the problem entities and value objects addresses and where it shows up in real code.

The idea

The core mechanism, with one diagram.

Trade-offs

What you give up, and the failure modes to name before an interviewer asks.

In an interview

How to bring it up, how deep to go, and the follow-up questions to expect.

Key takeaways

• One sentence you can say out loud.
• When to reach for it, and when not to.
• The neighbouring topic to connect it to.