Cargo dependency management in Rust - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is Cargo in Rust?

Cargo is Rust's package manager and build system. It helps manage dependencies, compile code, and build packages.

beginner

How do you add a new dependency to a Rust project using Cargo?

You add the dependency under the [dependencies] section in the Cargo.toml file with the package name and version.

intermediate

What command updates all dependencies to the latest allowed versions in Cargo?

The command is cargo update. It updates the Cargo.lock file with the newest versions allowed by Cargo.toml.

intermediate

What is the purpose of the Cargo.lock file?

Cargo.lock records the exact versions of dependencies used to ensure reproducible builds across different machines.

advanced

How can you specify a dependency from a Git repository in Cargo.toml?

You specify the dependency with a git key and the repository URL, for example:<br>mycrate = { git = "https://github.com/owner/repo.git" }

Where do you declare dependencies for a Rust project?

A In the Cargo.lock file

B In the main.rs file

C In the Cargo.toml file

D In the src folder

Dependencies are declared in Cargo.toml under the [dependencies] section.

What does the command cargo build do?

A Updates Cargo.toml

B Only downloads dependencies

C Removes unused dependencies

D Compiles the project and downloads dependencies if needed

cargo build compiles your Rust project and fetches any missing dependencies.

What file ensures that all developers use the same dependency versions?

A Cargo.lock

B Cargo.toml

C main.rs

D README.md

Cargo.lock locks the exact versions of dependencies to ensure consistent builds.

How do you specify a dependency version range in Cargo.toml?

A "^1.2.3" means compatible with 1.2.3

B "=1.2.3" means any version

C "~1.2.3" means older than 1.2.3

D "*" means no dependencies

"^1.2.3" means Cargo can use versions compatible with 1.2.3, like 1.3.0 but not 2.0.0.

Which command updates the Cargo.lock file to the latest allowed dependency versions?

A cargo run

B cargo update

C cargo clean

D cargo new

cargo update updates dependencies in Cargo.lock to the newest versions allowed by Cargo.toml.

Explain how Cargo manages dependencies in a Rust project.

Think about where dependencies are listed and how Cargo ensures consistent builds.

Describe how to add a dependency from a Git repository using Cargo.

Focus on the syntax inside Cargo.toml for git dependencies.