Rust binary and library crates in one project
WHAT IT TESTS: crate structure and code reuse. OUTLINE: a binary crate has main and produces an executable; a library crate has lib.rs and is reusable; put logic in the lib and a thin main that calls it. RED FLAG: duplicating core logic inside main.rs.
WHAT IT TESTS: whether you separate reusable logic from a CLI entry point. ANSWER OUTLINE: a binary crate is rooted at main.rs with a main function and compiles to an executable; a library crate is rooted at lib.rs, has no main, and is meant to be depended on. A package can contain both, so you put all core logic in lib.rs and keep main.rs thin, calling the library, which makes the logic testable and reusable by others. RED FLAG: placing business logic in main.rs where it cannot be imported or unit-tested cleanly.
Read the original → interview
- #rust
- #crates
- #cargo
- #library
- #cli
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