How Do I Think Logically When Programming?

How do I think logically when programming? I have folders that contain mp4, text, pdf, doc, mp3 files and I would like to separate them. I can write Ruby code, but it’s the logic that kills me. I've worked on this problem for 3 weeks.

This could be normal for beginners in a certain sense, yes. You should not be forgetting the fundamental logic of how to make your programs work correctly. You shouldn't be forgetting the style of languages, for example if t are procedural, declarative, use brackets or indentations, parentheses, whatever. Forgetting the syntax for certain things, the names of functions, the order of parameters, names of common libraries… that's perfectly normal for anyone at any level. In the three decades I've been writing code, these things have changed many times, and new languages and libraries pop up all the time. This is the whole point of auto-completion features you will see in most decent programming environments today. It's an admission that this problem is common, and provides a simple solution that doesn't interrupt your work. The productivity and accuracy improvements provided by these features should not be ignored. Accept that you probably need that help, and be grateful for it. It's not “cool" to slow yourself down just so you can say you don't use intellisense. It just means you're probably slower and creating more bugs.