Fundermental rust and unit test.
$ curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh
$ source $HOME/.cargo/env
$ cargo init demo-rust
$ cargo build
$ cargo run --example array
$ cargo run --example conditional
$ cargo run --example controlflow
$ cargo run --example enum
$ cargo run --example number
$ cargo run --example string
$ cargo run --example struct
$ cargo run --example trait
$ cargo run --example tuple
$ cargo run --example vector
$ cargo test --example array
$ cargo fmt