Intro to Rust
Divya
@shortdiv
Software Engineer at Netlify
Goals:
Share knowledge
Ask Questions
Pair
Grow
Have Fun!
What is Rust?
What is Rust?
Rust is a statically and strongly typed modern systems programming language focusing on safety, speed, and concurrency. It accomplishes these goals by being memory safe without using garbage collection.
all types are known at compile-time
types are designed to make it harder to write incorrect programs
generating the best possible machine code with full control of memory use
e.g. OS, device drivers
Why Rust?
Top Down Rust
| Package Manager | npm | Go modules | crates |
| Version Manager | nvm | go get | rustup |
| Registry | npmjs.com | pkg.go.dev | crates.io |
| Config | package.json | go.mod | cargo.toml |
| Task Runner | npm scripts/gulp | make/go run/go build | make / cargo run |
| Linter | eslint/tslint | golint | clippy |
| Formatter | prettier | go fmt | rustfmt |
| JavaScript | Go | Rust |
|---|
Installation
$ curl --proto '=https' --tlsv1.2 https://sh.rustup.rs -sSf | sh
[[ Install Rustup ]]
https://www.rust-lang.org/tools/install
windows
mac
rustc
├── babys_first_rust/
└── src
└── main.rs
your code
Compiling + Executing
rustc main.rs
./main
Cargo
├── babys_first_rust/
├── src
├── main.rs └── cargo.toml
your config
your code
cargo.toml
[package] name = "hello_cargo" version = "0.1.0" authors = ["Your Name <you@example.com>"] edition = "2018" [dependencies]
Compiling + Executing
cargo build
./target/debug/hello_cargo
OR
cargo run
Rust Playground
println!("Hello, world!");
fn main() { println!("Hello, world!"); }
println!("Hello, world!");
fn main() { println!("Hello, world!"); }
4 spaces
end of expression
first code that runs in every executable Rust program
console log macro
println!("Hello {}", SOME_VAR);
println!("Hello {:?}", "world");
Rust Basics
Variables and Constants
Variables and Mutability
Variables and Shadowing
Variables and Shadowing
Primitive Data Types
| Type | Example Values |
|---|---|
| bool (scalar) | true/false |
| char (scalar) | ❤️, a, 東京 |
| i8, i16, i32, i64, isize (scalar) | -5, 42, |
| u8, u16, u32, u64, usize (scalar) | 5, 42 |
| f32, f64 (scalar) | 3.14, 4,5 |
| array (compound) | let array: [i32; 5] = [0, 1, 2, 3, 4]; |
| slice | let slice = &array[0..3]; |
| str | "Hello World" |
| tuple (compound) | let tuple = ("hello", 42, "world", [3,6,9]); |
Functions
Functions with Params
Functions with Returns
Conditionals
Conditionals: While
Iterators
Let's Work!
The rules of raindrops are that if a given number:
- has 3 as a factor, add 'Pling' to the result.
- has 5 as a factor, add 'Plang' to the result.
- has 7 as a factor, add 'Plong' to the result.
- does not have any of 3, 5, or 7 as a factor, the result should be the digits of the number.
Solution
Further Resources
Thank you!
Rustlings: Live!
By shortdiv
