> I guess there are people who plan everything in their mind and the coding part is just typing out their ideas (instead of developing their ideas during code editing).

I don't think there are, I think Gall's law that all complex systems evolve from simpler systems applies.

I play with code when I program with Rust. It just looks slightly different. I deliberately trigger errors and then read the error message. I copy code into scratch files. I'm not very clever; I can't plan out a nontrivial program without feedback from experiments.