rustlings

Small exercises to get you used to reading and writing Rust code. Includes practice reading and
responding to compiler messages!

This repo is very much the smallest thing that could possibly work 😃

To do these exercises

Thanks to btbytes’ prlinks, you
can now click on the links below to load the exercises in the rust playground!

There are infinite correct answers— the exercises are sometimes left very open-ended. Scroll down
in the playground to find comments that have hints.

To do these exercises in your local environment and execute them online afterwards:

• clone the repo to your local environment: git clone git@github.com:rustlings/rustlings.git

• edit the rustling that you want, per example variables/variables1.rs

• run cargo run in the project folder

• you will notice that you README file was modified and now it has the new content of the file that you edited

• click in the new URL in the README and you will redirect to the rust playground and the whole file content it will be loaded

• to execute in the rust playground, just click on run

Need help?

If you need more help or would like to compare solutions, you can ask in #rust-beginners on irc.mozilla.org, the
user forum, or the subreddit. If an
exercise could be improved in any way, please create an issue or submit a pull request!

Variable bindings

Relevant chapter in The Rust Programming Language

• “variables1.rs”

• “variables2.rs”

• “variables3.rs”

• “variables4.rs”

Functions

Relevant chapter in The Rust Programming Language

• “functions1.rs”

• “functions2.rs”

• “functions3.rs”

• “functions4.rs”

• “functions5.rs”

Primitive types

Relevant chapter in The Rust Programming Language

• “primitive_types1.rs”

• “primitive_types2.rs”

• “primitive_types3.rs”

• “primitive_types4.rs”

• “primitive_types5.rs”

• “primitive_types6.rs”

Tests

Going out of order from the book to cover tests— many of the following exercises will ask you to
make tests pass!

Relevant chapter in The Rust Programming Language

• “tests1.rs”

• “tests2.rs”

• “tests3.rs”

• “tests4.rs”

If

Relevant chapter in The Rust Programming Language

• “if1.rs”

Strings

Relevant chapter in The Rust Programming Language

• “strings1.rs”

• “strings2.rs”

• “strings3.rs”

Move semantics

These exercises are adapted from pnkfelix’s Rust Tutorial — thank you Felix!!!

Relevant chapters in the book:

• Ownership

• References and borrowing

Note that the exercises in this section may look similar to each other but they are subtly
different 😃

• “move_semantics1.rs”

• “move_semantics2.rs”

• “move_semantics3.rs”

• “move_semantics4.rs”

Modules

Relevant chapter in The Rust Programming Language

• “modules1.rs”

• “modules2.rs”

Macros

Check out:

• The Macros section of the first edition of the book book

• The Macros appendix of the second edition of the book

• The Little Book of Rust Macros

• “macros1.rs”

• “macros2.rs”

• “macros3.rs”

• “macros4.rs”

Error Handling

The Error Handling
and Generics sections are
relevant.

• “option1.rs”

• “result1.rs”

• “errors1.rs”

• “errors2.rs”

• “errors3.rs”

• “errorsn.rs”

Standard library types

Arc

The Concurrency section
is relevant.

• “arc1.rs”

Iterators

Do not adjust your monitors— iterators 1 and 2 are indeed missing. Iterator 3 is a bit challenging
so we’re leaving space for some exercises to lead up to it!

Check out the Iterators chapter of the book and the Iterator docs.

• “iterator3.rs”

• “iterators4.rs”

Threads

See the Dining Philosophers example and the
Concurrency Chapter from the
book.

• “threads1.rs”

Uncategorized

A few exercises based on things I’ve encountered or had trouble with getting used to.

• “ex1.rs”

• “ex2.rs”

• “ex3.rs”

• “ex4.rs”

• “ex5.rs”

To help with this repo/TODO list

• File issues for problems or suggestions!

• Contribute more exercises! Anything that took you time to get used to, or that you had trouble
  with, or that deserves practice would be a good exercise!

• How could the process of doing these exercises work better? This is an open-ended question 😃 Are
  the playground links good enough? Are there ways that we could make going to the next exercise
  easier without forking the playground??