Intro

Intro Exercises

Overview

The intro exercises familiarize you with the Rustlings workflow and basic Rust syntax.

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intro1 - Getting Started

Concept: Navigating Rustlings

The first exercise is simply about learning how to use Rustlings itself. Press n in the terminal to move to the next exercise.

fn main() {
    // Congratulations, you finished the first exercise 🎉
    // As an introduction to Rustlings, the first exercise only required
    // entering `n` in the terminal to go to the next exercise.
}

Key Takeaway: Rustlings watches your files — saving triggers a recheck.

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intro2 - Hello World

Concept: The println! macro

The fix was simple: use println! instead of printline!.

fn main() {
    println!("Hello world!");
}

Key Takeaways:

• println! is a macro (notice the !)
• Macros are different from functions — they expand at compile time
• The exclamation mark distinguishes macros from regular functions

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Rust Book Reference

• §1.2 Hello, World!