Have you been asked this question in a screening interview or in-person interview?
For me, I don't really know how to answer this question. But I know that 9 or 10 might not be the best answer unless you know the language inside out. But I know that I have overcome some hurdles of becoming a better developer over the last few years. I find myself interested in learning how a library was built and building one myself, and digging deep into its code base.
How do you answer this question? Can you share your experience or your reflection of where you are?
What is the journey like for a person to become really good? For example, a creator of React, Redux, or Rails framework?