Rust

A language empowering everyone to build reliable and efficient software.

When to Use

• Systems programming (drivers, OS)
• WebAssembly
• Performance-critical applications
• Command-line tools (great developer experience)

Quick Start

fn main() {
    println!("Hello, World!");

    let mut x = 5; // mutable
    x = 6;

    let y = 10; // immutable by default
}

Core Concepts

Ownership & Borrowing

The borrow checker ensures rules are followed at compile time.

• Each value has a single owner.
• You can have multiple immutable borrows OR one mutable borrow, but not both simultaneously.

Lifetimes

Ensuring references remain valid for as long as they are used.

Traits

Similar to interfaces, defining shared behavior.

Best Practices

Do:

• Embrace the borrow checker (it’s your friend)
• Use Result<T, E> and Option<T> for error handling
• Use cargo clippy for linting
• Use match for exhaustive pattern matching

Don’t:

• Use unsafe unless absolutely necessary
• unwrap() in production code (use proper error handling)

References

• The Rust Programming Language Book
• Rust by Example