Dividing Your Code Into Modules
You can write huge programs in one file, but dividing your code into smaller sections—known as modules in Rust—offers significant advantages:
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It’s a lot easier to find your Map functionality in a file named map.rs than it is to remember that it’s somewhere around line 500 of an ever-growing main.rs.
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Cargo can compile modules concurrently, leading to much better compilation times.
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Bugs are easier to find in self-contained code that limits linkages to other sections of code.
Modules may either be a single rs file or a directory. In this chapter, you’ll use single file modules. You’ll learn to create directory-based modules in Multi-File Modules.
Crates and Modules
Rust programs are divided into crates and modules ...
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