Are you ready for this?

Ten questions, free, marked as you go, written at exactly the level of the TypeScript Certification. Nothing is recorded and no account is needed — it exists so you can decide for yourself rather than take our word for it.

The real paper is 50 questions in one sitting with a 70% pass mark and no partial credit. It is not a certificate of attendance, and roughly a third of it is foundations — the point is the whole language, not the parts you enjoyed.

Question 1 of 10

Basic types and inference

What type does TypeScript infer for a versus b?

let a = 5;
const b = 5;

Pick an answer to see whether it is right. You cannot change it afterwards — that is the point.