For me it's when you can start reading and understanding the code that other people wrote. This does not mean that you have to understand the "why?"(which can b

For me it's when you can start reading and understanding the code that other people wrote. This does not mean that you have to understand the "why?"(which can be a bit hard without context) behind the code just the "how?". I think it is a good indicator of how comfortable you are in your chosen language.