Modules Definition

• In Rust there is not a 1 to 1 mapping of files to the module tree hierarchy

• We must build the module tree explicitly by hand in our code

• When we think of code, we usually imagine a hierarchy of files organized in directories

• Rust lets you create modules closely related to your file structure

• There are two ways in Rust to declare a module. For example, a module foo can be represented as

  • a file named foo.rs
  • a directory named foo with a file mod.rs inside