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191 lines
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# rustlings
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Small exercises to get you used to reading and writing Rust code. Includes practice reading and
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responding to compiler messages!
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This repo is very much the smallest thing that could possibly work :)
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## To do these exercises
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Thanks to [btbytes'](https://twitter.com/btbytes) [prlinks](https://github.com/btbytes/prlink), you
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can now click on the links below to load the exercises in the rust playground!
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There are infinite correct answers-- the exercises are sometimes left very open-ended. Scroll down
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in the playground to find comments that have hints.
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If you need more help or would like to compare solutions, you can ask in [#rust-beginners on
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irc.mozilla.org](https://chat.mibbit.com/?server=irc.mozilla.org&channel=%23rust-beginners ), the
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[user forum](https://users.rust-lang.org/), or [the subreddit](https://reddit.com/r/rust). If an
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exercise could be improved in any way, please [create an
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issue](https://github.com/carols10cents/rustlings/issues/new) or submit a pull request!
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### Variable bindings
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[Relevant chapter in The Rust Programming
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Language](https://doc.rust-lang.org/book/second-edition/ch03-01-variables-and-mutability.html)
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{{ playground_link "variables/variables1.rs" }}
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{{ playground_link "variables/variables2.rs" }}
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{{ playground_link "variables/variables3.rs" }}
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{{ playground_link "variables/variables4.rs" }}
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### Functions
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[Relevant chapter in The Rust Programming
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Language](https://doc.rust-lang.org/book/second-edition/ch03-03-how-functions-work.html)
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{{ playground_link "functions/functions1.rs" }}
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{{ playground_link "functions/functions2.rs" }}
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{{ playground_link "functions/functions3.rs" }}
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{{ playground_link "functions/functions4.rs" }}
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{{ playground_link "functions/functions5.rs" }}
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### Primitive types
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[Relevant chapter in The Rust Programming
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Language](https://doc.rust-lang.org/book/second-edition/ch03-02-data-types.html)
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{{ playground_link "primitive_types/primitive_types1.rs" }}
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{{ playground_link "primitive_types/primitive_types2.rs" }}
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{{ playground_link "primitive_types/primitive_types3.rs" }}
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{{ playground_link "primitive_types/primitive_types4.rs" }}
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{{ playground_link "primitive_types/primitive_types5.rs" }}
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{{ playground_link "primitive_types/primitive_types6.rs" }}
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### Tests
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Going out of order from the book to cover tests-- many of the following exercises will ask you to
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make tests pass!
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[Relevant chapter in The Rust Programming
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Language](https://doc.rust-lang.org/book/second-edition/ch11-01-writing-tests.html)
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{{ playground_link "tests/tests1.rs" }}
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{{ playground_link "tests/tests2.rs" }}
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{{ playground_link "tests/tests3.rs" }}
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{{ playground_link "tests/tests4.rs" }}
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### If
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[Relevant chapter in The Rust Programming
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Language](https://doc.rust-lang.org/book/second-edition/ch03-05-control-flow.html)
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{{ playground_link "if/if1.rs" }}
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### Strings
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[Relevant chapter in The Rust Programming
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Language](https://doc.rust-lang.org/book/second-edition/ch08-02-strings.html)
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{{ playground_link "strings/strings1.rs" }}
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{{ playground_link "strings/strings2.rs" }}
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{{ playground_link "strings/strings3.rs" }}
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### Move semantics
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These exercises are adapted from [pnkfelix]()'s [Rust
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Tutorial](https://pnkfelix.github.io/rust-examples-icfp2014/) -- thank you Felix!!!
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Relevant chapters in the book:
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- [Ownership](https://doc.rust-lang.org/book/second-edition/ch04-01-what-is-ownership.html)
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- [References and borrowing](https://doc.rust-lang.org/book/second-edition/ch04-02-references-and-borrowing.html)
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Note that the exercises in this section may look similar to each other but they are subtly
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different :)
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{{ playground_link "move_semantics/move_semantics1.rs" }}
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{{ playground_link "move_semantics/move_semantics2.rs" }}
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{{ playground_link "move_semantics/move_semantics3.rs" }}
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{{ playground_link "move_semantics/move_semantics4.rs" }}
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### Modules
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[Relevant chapter in The Rust Programming
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Language](https://doc.rust-lang.org/book/second-edition/ch07-01-mod-and-the-filesystem.html)
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{{ playground_link "modules/modules1.rs" }}
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{{ playground_link "modules/modules2.rs" }}
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### Macros
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Check out:
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- [The Macros section of the first edition of the book
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book](https://doc.rust-lang.org/book/first-edition/macros.html)
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- [The Macros appendix of the second edition of the
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book](https://doc.rust-lang.org/book/second-edition/appendix-04-macros.html)
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- [The Little Book of Rust Macros](https://danielkeep.github.io/tlborm/book/index.html)
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{{ playground_link "macros/macros1.rs" }}
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{{ playground_link "macros/macros2.rs" }}
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{{ playground_link "macros/macros3.rs" }}
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{{ playground_link "macros/macros4.rs" }}
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### Error Handling
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The [Error
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Handling](https://doc.rust-lang.org/book/second-edition/ch09-02-recoverable-errors-with-result.html)
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and [Generics](https://doc.rust-lang.org/book/second-edition/ch10-01-syntax.html) sections are
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relevant.
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{{ playground_link "error_handling/option1.rs" }}
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{{ playground_link "error_handling/result1.rs" }}
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{{ playground_link "error_handling/errors1.rs" }}
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{{ playground_link "error_handling/errors2.rs" }}
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{{ playground_link "error_handling/errors3.rs" }}
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{{ playground_link "error_handling/errorsn.rs" }}
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### Standard library types
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#### `Arc`
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The [Concurrency](https://doc.rust-lang.org/book/second-edition/ch16-03-shared-state.html) section
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is relevant.
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{{ playground_link "standard_library_types/arc1.rs" }}
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#### Iterators
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Do not adjust your monitors-- iterators 1 and 2 are indeed missing. Iterator 3 is a bit challenging
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so we're leaving space for some exercises to lead up to it!
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Check out the [Iterators chapter of the
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book](https://doc.rust-lang.org/book/second-edition/ch13-02-iterators.html) and the [Iterator
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docs](https://doc.rust-lang.org/stable/std/iter/trait.Iterator.html).
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{{ playground_link "standard_library_types/iterator3.rs" }}
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{{ playground_link "standard_library_types/iterators4.rs" }}
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### Threads
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See [the Dining Philosophers
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example](https://doc.rust-lang.org/1.4.0/book/first-edition/dining-philosophers.html) and the
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[Concurrency Chapter](https://doc.rust-lang.org/book/second-edition/ch16-01-threads.html) from the
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book.
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{{ playground_link "threads/threads1.rs" }}
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### Uncategorized
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A few exercises based on things I've encountered or had trouble with getting used to.
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{{ playground_link "ex1.rs" }}
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{{ playground_link "ex2.rs" }}
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{{ playground_link "ex3.rs" }}
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{{ playground_link "ex4.rs" }}
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{{ playground_link "ex5.rs" }}
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## To help with this repo/TODO list
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* File issues for problems or suggestions!
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* Contribute more exercises! Anything that took you time to get used to, or that you had trouble
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with, or that deserves practice would be a good exercise!
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* How could the process of doing these exercises work better? This is an open-ended question :) Are
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the playground links good enough? Are there ways that we could make going to the next exercise
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easier without forking the playground??
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