Oh I see. It’s fine if you cannot reproduce the program from memory after copying it once, because that’s not how software is written. The idea is to understand what the various statements are doing in the program - how to use loops, counters, variables, etc. and also howo to break a problem into little steps and procedures which you then turn into code. If I were you I would read a book or watch some videos about programming.

There are only a handful of basic concepts in programming: Variables, Functions or Procedures, Input & Output, Conditional branching, Looping and maybe a couple I’m forgetting. If you study what these are, what they are for and how they work, you will start to understand how to create your own program.

This might be a good place to start: https://coddy.tech/landing/javascript