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Project structure · easy

19. Modules and Visibility

mod, pub and use.

1 min read2 questionsup to 50 XPtopic 19/50

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Modules form a tree rooted at the crate. Items are private by default; `pub`, `pub(crate)` and `pub(super)` widen visibility. `use` brings paths into scope, and files or directories map to modules automatically.

How to study this topic

  1. 1. Read the explanation once end to end, skipping the code.
  2. 2. Re-read the code snippets and say out loud what each line does.
  3. 3. Answer the quiz without scrolling back — that is the real check.
  4. 4. Read every explanation, even for the answers you got right.

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Check your understanding

  1. 1. Default item visibility is…

  2. 2. Which limits visibility to the crate?

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