Rust Demo Examples

Practice programs, one file each. Every demo is self-contained, commented, and uses only the standard library — so nothing needs downloading: compile with rustc and run.

How to use: click View to open a file in the code viewer, read its comments, download it, then run it on your machine. Most demos are plain binaries; the tests demo (#20) needs --test.

rustc 01_hello.rs && ./01_hello          # compile and run a demo
rustc --test 20_testing.rs -o 20_testing   # compile unit tests
./20_testing

Foundations

Hello world, variables, scalar types, and strings — PHASE 1.

#	Description	Link
1	Hello, World	View
2	Variables & Shadowing	View
3	Scalar Types & Casting	View
4	Strings & Formatting	View

Ownership & Borrowing

Moves, borrows, and lifetimes — the core of Rust.

#	Description	Link
5	Move Semantics & Copy	View
6	Shared & Mutable Borrowing	View
7	Lifetime Annotations	View

Functions & Collections

Functions, closures, and the standard collections.

#	Description	Link
8	Functions & Return Values	View
9	Closures	View
10	Vec, HashMap, HashSet	View

Control & Errors

Conditionals, loops, and idiomatic error handling.

#	Description	Link
11	if/else and match	View
12	loop, while, for	View
13	Option, Result, and `?`	View

Generics & Traits

Generic functions, structs, and trait-based polymorphism.

#	Description	Link
14	Generics	View
15	Traits & Trait Objects	View

Iterators & Smart Pointers

Lazy pipelines and the ownership helpers.

#	Description	Link
16	Iterator Combinators	View
17	Box, Rc, RefCell	View

Professional

Structs & methods, threads, and unit tests.

#	Description	Link
18	Structs & Methods	View
19	Threads & Channels	View
20	Unit Tests (`--test`)	View

Practice move: after running each demo, break it on purpose — move a value twice, borrow mutably while a shared borrow lives, or index past the end — and read each compiler error before fixing it.