Explore Rust’s unique features with 24 brain-teasing puzzles. Gain insights into Rust concepts, enhancing your skills and preparing for advanced topics after completing the course.

newrust.tar.gz

codewidgetrust

livewidgetrust

livewidgetrust-cargo-toml-release

codewidgetrust-cargo

livewidgetrust-cargo-main-toml-release

livewidgetrust-cargo-clippy

livewidgetrust-cargo-main-release

livewidgetrust-cargo-nightly

livewidgetrust-cargo-release-update

livewidgetrust-cargo-languages

livewidgetrust-shadow-same

livewidgetrust-shadow-reuse

livewidgetrust-shadow-unrelated

live-cargo-clippy

live-cargo-release-update

live-cargo-nightly

live-cargo-shadow-same

live-cargo-shadow-reuse

live-cargo-shadow-unrelated

live-cargo-sleepless

livewidgetrust-cargo-release-update-puzzle11

This course provides insights into Rust’s unique features by exploring them in 24 brain-teasing puzzles. Each puzzle is explained in its following lesson. Complete all 24, and by the time you’re done, your knowledge about different concepts in Rust will definitely be improved, and you will be ready to move on to more advanced concepts.

Rust Brain Teasers

# Test it out

Hit “Run” to see the code’s output.

fn main() {
    if 'X' == 'Χ' {
        println!("It matches!");
    } else {
        println!("It doesn't match.");
    }
}

# Explanation

Unicode allows for **homoglyphs**, which are characters that are very similar or identical and can be encoded in different ways. The first `X` is the Latin Unicode character, encoded as `0x58`. The second `Χ` is the capitalized version of the Greek letter chi, encoded in UTF- 8 as `0xCE 0xA7`. If we look closely, they aren’t quite identical, but in some fonts, notably `Consolas` on Windows, they are indistinguishable.

Homoglyphs are popular in *phishing* attacks. The domain name [bertbank.com](#) may look like it’s innocently asking us to change our password, but the `e` is actually Cyrillic `(0xD0 0xB5)`. We hopefully never hand over login details to a fake bank, but it’s not so easy to see the fake domain name at first glance.


Let’s learn how UTF-8 encoded character comparison works in Rust.

Puzzle 10: Explanation

Introduction

Puzzles

Wrapping it up

Puzzle 10: Explanation