Cargo

It is the package manager for rust. It does the following things:
- Manages Rust Projects
- Download packages or dependencies
- Build both your code and it's dependencies
Check Cargo Installation or Version:
```
cargo --version
```
Create New Boilerplate Project:
```
cargo new {project-name}
```
Create Boilerplate Binary Project (only main.rs):
```
cargo new {project-name} --bin
```
Create Boilerplate Library Project (for writing tests, contains lib.rs):
```
cargo new {project-name} --lib
```
Help for Cargo new:
```
cargo new --help
```
Build a Project (Installing Dependencies and Compiling):
```
cargo build
```
Run a Project (build + run):
```
cargo run
```

Running through executable binary:

./target/debug/hello_cargo # or .\target\debug\hello_cargo.exe on Windows

Compile but don't generate executable (it's just faster than cargo build):
```
cargo check
```
Build for releases (it's optimized and binaries lives in target/release):
```
cargo build --release
```
To generate docs, you can access them through target/doc:
```
cargo doc
```
To generate docs of all dependencies of your project and run them in browser:
```
cargo doc --open
```
We can install cargo-expand to use cargo libraries system wide.
```
cargo install cargo-expand
```
The cargo expand command
```
cargo expand
```
To install a package from crates.io into your system, you may use this command (only binary crates can be installed and ensure that $HOME/.cargo/bin is in your $PATH):
```
cargo install <package-name>
```
To list out custom cargo commands:
```
cargo --list
```
To automatically format code:
```
cargo fmt
```
To automatically fix warnings (fixable by compiler):
```
cargo fix
```
To Lint your code:
```
cargo clippy
```

The `opt-level`

The opt-level setting controls the number of optimizations Rust will apply to your code, with a range of 0 to 3.

// Filename: Cargo.toml
[profile.dev]
opt-level = 0 // Less Optimization, less compiling time

[profile.release]
opt-level = 3 // More Optimizations, more compiling time

You can override any default setting by adding a different value for it in Cargo.toml. To override, you can add these two lines below the above lines.
```
// Filename: Cargo.toml
[profile.dev]
opt-level = 1
```
To learn more about customizing profiles, you can read the docs here.

For more information about Cargo, check out its documentation.

MASQ Rust Docs

Cargo

The opt-level

The `opt-level`