What is unknown versus any?
PICTURE THIS: RAG CHATBOT
Simple meaning
Any turns off checking, so I can access any property and hide bugs.
WHY — TypeScript instead of guessing?
Why interviewers care about TypeScript:
contrast on TypeScript, not two memorised paragraphs.
the developer, then one case where picking wrong hurts.
Name the idea, why it exists, then one short example.
End with when you use it and one common pitfall.
STEPS — What happens step by step?
Before you speak the answer, walk the interviewer through these steps:
- 1Any turns off checking,
so I can access any property and hide bugs.
- 2Unknown forces me to
narrow before use, which is what I want for JSON.parse and untyped API boundaries.
- 3I treat any as
a debt to remove.
- 4Give an example
One tiny concrete case you can say aloud.
- 5Common mistake
What juniors usually get wrong.
- 6Close
When you pick this over the alternative.
EXAMPLE — See it in action
Here's a short line you can speak, broken into clear beats:
Note: Adapt this scaffold to your own project — keep it under 60–90 seconds.
Key takeaway
Any turns off checking, so I can access any property and hide bugs. Unknown forces me to narrow before use, which is what I want for JSON.parse and untyped API boundaries.