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613 lines
19 KiB
613 lines
19 KiB
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<title>Por que você deveria aprender Rust</title> |
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<meta name="description" content="Por que você deveria aprender Rust"> |
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<meta name="author" content="Julio Biason"> |
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<body> |
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<div class="reveal"> |
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<div class="slides"> |
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<section> |
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<section data-background="_images/rust-ferris.png" data-header> |
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<h1 class="semi-opaque">Por Que Rust</h1> |
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</section> |
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</section> |
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<section> |
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<section> |
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<img src="_images/avatar-20170726.png" alt="Me" style="float:left;width:200px;" class="no-border"> |
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<div> |
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<ul class="empty"> |
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<li>Júlio Biason</li> |
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<li>https://functional.cafe/@juliobiason</li> |
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<li>julio.biason@pm.me</li> |
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<li><a href="http://presentations.juliobiason.net">http://presentations.juliobiason.net</a></li> |
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</ul> |
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</div> |
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</section> |
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</section> |
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<section> |
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<section> |
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<p> |
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<a href="https://insights.stackoverflow.com/survey/2019"> |
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A languagem mais amada segundo o StackOverflow |
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Survey 2019 |
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</a> |
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<p class="fragment">... pelo 4⁰ ano seguido.</p> |
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</p> |
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</section> |
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</section> |
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<section> |
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<section> |
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<h2>Imutabilidade por Default</h2> |
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</section> |
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<section> |
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<pre><code class="hljs rust" data-trim> |
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fn main() { |
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let a = 2; |
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a = 3; |
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println!("{}", a); |
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} |
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</code></pre> |
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</section> |
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<section> |
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<pre><code class="hljs" data-trim> |
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3 | let a = 2; |
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| - |
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| | |
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| first assignment to `a` |
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| help: make this binding mutable: `mut a` |
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4 | a = 3; |
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| ^^^^^ cannot assign twice to immutable variable |
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</code></pre> |
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</section> |
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<section> |
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<pre><code class="hljs rust" data-trim> |
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fn main() { |
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let mut a = 2; |
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a = 3; |
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println!("{}", a); |
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} |
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</code></pre> |
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</section> |
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</section> |
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<section> |
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<section> |
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<h2>Borrow Checker</h2> |
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</section> |
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<section> |
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<pre><code class="hljs rust" data-trim> |
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a = String::from("hello"); |
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</code></pre> |
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</section> |
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<section> |
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"Variável <code>a</code> tem o valor <code>"hello"</code>" |
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</section> |
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<section> |
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<div> |
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"Posição de memória apontada por <code>a</code> tem o valor <code>"hello"</code>" |
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</div> |
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<div class="fragment"> |
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<pre><code> |
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0x3f5cbf89 = "hello" |
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</code></pre> |
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</div> |
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<img src="_images/rust-memory.png" alt="" class="fragment"> |
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</section> |
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<section> |
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<div> |
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A language that doesn't affect the way you think |
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about programming, is not worth knowing. |
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</div> |
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<div> |
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-- Alan Perlis, "ALGOL" |
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</div> |
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</section> |
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<section> |
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<pre><code class="hljs rust" data-trim> |
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fn main() { |
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let a = String::from("hello"); |
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let _b = a; |
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println!("{}", a) |
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} |
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</code></pre> |
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</section> |
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<section> |
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<pre><code> |
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error[E0382]: borrow of moved value: `a` |
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--> src/main.rs:5:20 |
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| |
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4 | let _b = a; |
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| - value moved here |
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5 | println!("{}", a) |
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| ^ value borrowed here after move |
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| |
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= note: move occurs because `a` has type `std::string::String`, which does not implement the `Copy` trait |
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</code></pre> |
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</section> |
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<section> |
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<p>E se eu precisar acessar a variável em mais de um lugar?</p> |
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<h3 class="fragment">References</h3> |
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</section> |
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<section> |
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<pre><code class="hljs rust" data-trim> |
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fn main() { |
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let a = String::from("hello"); |
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let _b = &a; |
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println!("{}", a) |
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} |
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</code></pre> |
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</section> |
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<section> |
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<img src="_images/rust-reference.png" alt=""> |
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</section> |
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<section> |
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<h3>Regras do Borrow Checker</h3> |
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<p class="fragment"> |
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Uma região de memória tem apenas um dono. |
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</p> |
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<p class="fragment"> |
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A região é desalocada quando o dono sair de escopo. |
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</p> |
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</section> |
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<section> |
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<h3>Regras do Borrow Checker</h3> |
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<p class="fragment"> |
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Uma região de memória pode ter inifitas referências. |
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</p> |
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<p class="fragment"> |
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... desde que elas não durem mais do que o dono. |
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</p> |
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</section> |
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<section> |
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<h3>Regras do Borrow Checker</h3> |
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<p class="fragment"> |
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É possível ter uma referência mutável de uma região de memória. |
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</p> |
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<p class="fragment"> |
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... mas para haver uma referência mutável ela deve ser |
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a <strong>única</strong> referência. |
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</p> |
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</section> |
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<section> |
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<img src="_images/dunno.jpg" alt=""> |
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</section> |
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<section data-transition="fade"> |
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<pre><code class="hljs go" data-trim>presente := Presente { ... } |
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canal <- presente |
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</code></pre> |
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</section> |
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<section data-transition="fade"> |
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<pre><code class="hljs go" data-trim>presente := Presente { ... } |
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canal <- presente |
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presente.abrir()</code></pre> |
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</section> |
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<section> |
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<a href="https://swift.org/blog/swift-5-exclusivity/">Swift 5 Exclusivity Enforcement</a> |
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</section> |
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</section> |
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<section> |
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<section> |
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<h2>Hora da anedota!</h2> |
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<img class="stretch" src="_images/senta-que-la-vem-historia.gif" alt=""> |
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</section> |
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<section> |
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<p>localtime</p> |
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<p class="fragment">SimpleDateFormatter</p> |
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</section> |
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<section> |
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<h3>Rust resolveria isso?</h3> |
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<h2 class="fragment">Não</h2> |
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<h4 class="fragment">... na verdade, nem ia compilar.</h4> |
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</section> |
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</section> |
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<section> |
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<section> |
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<h2>Tipos Algébricos</h2> |
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<p class="fragment">(structs)</p> |
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</section> |
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<section> |
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<h3>struct</h3> |
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<pre><code class="hljs rust" data-trim> |
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struct Present { |
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package_color: String, |
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content: String |
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} |
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</code></pre> |
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</section> |
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|
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<section> |
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<h3>enum</h3> |
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<pre><code class="hljs rust" data-trim> |
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enum IpAddr { |
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V4, |
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V6 |
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} |
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</code></pre> |
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</section> |
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<section> |
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<pre><code class="hljs rust" data-trim> |
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enum IpAddr { |
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V4(String), |
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V6(String), |
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} |
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</code></pre> |
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</section> |
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<section> |
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<pre><code class="hljs rust" data-trim> |
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let home = IpAddr::V4(String::from("127.0.0.1"); |
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match home { |
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V4(address) => println!("IPv4 addr: {}", address), |
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V6(address) => println!("Ipv6 addr: {}", address), |
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} |
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</code></pre> |
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</section> |
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<section> |
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<pre><code class="hljs rust" data-trim> |
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enum Option<T> { |
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Some(T), |
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None |
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} |
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</code></pre> |
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</section> |
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</section> |
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<section> |
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<section> |
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<h2>Error Control</h2> |
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</section> |
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<section> |
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<pre><code class="hljs python" data-trim> |
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try: |
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something() |
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except Exception: |
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pass |
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</code></pre> |
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</section> |
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<section> |
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<pre><code class="hljs java" data-trim> |
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try { |
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something(); |
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} catch (Exception ex) { |
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System.out.println(ex); |
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} |
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</code></pre> |
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</section> |
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<section> |
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<pre><code class="hljs c" data-trim> |
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FILE* f = fopen("someting.txt", "wb"); |
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fprintf(f, "Done!"); |
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fclose(f); |
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</code></pre> |
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</section> |
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<section> |
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<div> |
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Onde o erro foi tratado nisso? |
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</div> |
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</section> |
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<section> |
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<pre><code class="hljs rust" data-trim> |
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enum Result<T, E> { |
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Ok(T), |
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Err(E), |
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} |
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</code></pre> |
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</section> |
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<section> |
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<pre><code class="hljs rust" data-trim> |
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match File::create("something.txt") { |
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Ok(fp) => fp.write_all(b"Hello world"), |
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Err(err) => println!("Failure! {}", err), |
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} |
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</code></pre> |
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</section> |
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<section> |
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<pre><code class="hljs rust" data-trim> |
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match File::create("something.txt") { |
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Ok(fp) => match fp.write_all(b"Hello world") { |
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Ok(_) => (), |
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Err(err) => println!("Can't write! {}", err), |
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} |
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Err(err) => println!("Failure! {}", err), |
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} |
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</code></pre> |
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</section> |
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<section> |
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<pre><code class="hljs rust" data-trim> |
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let mut file = File::create("something.txt").unwrap(); |
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file.write(b"Hello world").unwrap(); |
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</code></pre> |
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</section> |
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<section> |
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<pre><code class="hljs rust" data-trim> |
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let mut file = File::create("something.txt")?; |
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file.write(b"Hello world")?; |
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OK(()) |
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</code></pre> |
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</section> |
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</section> |
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<section> |
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<section> |
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<h2>Macros</h2> |
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</section> |
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</section> |
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<section> |
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<section> |
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<h2>Crazy stuff</h2> |
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</section> |
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<section> |
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<a href="https://medium.com/@shnatsel/how-rusts-standard-library-was-vulnerable-for-years-and-nobody-noticed-aebf0503c3d6">How Rust’s standard library was vulnerable for years and nobody noticed</a> |
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</section> |
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<section> |
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<a href="https://medium.com/@sgrif/no-the-problem-isnt-bad-coders-ed4347810270">No, the problem isn’t “bad coders”</a> |
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</section> |
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<section> |
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<img src="_images/rust-issues.png" alt="4.5k issues no Github" class="stretch"> |
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</section> |
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<section> |
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<a href="https://rustup.rs/">rustup</a> |
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|
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<div class="fragment"> |
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<small>stable-x86_64-pc-windows-msvc</small> |
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</div> |
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|
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<div class="fragment"> |
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<small>armv7-unknown-linux-gnueabihf</small> |
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</div> |
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|
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<div class="fragment"> |
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<small>wasm32-unknown-unknown</small> <small class="fragment">(WebAssembly)</small> |
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</div> |
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</section> |
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</section> |
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<section> |
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<section> |
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<h2>Bibliotecas</h2> |
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</section> |
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<section> |
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<h3>Rayon</h3> |
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<pre><code> |
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fn sum_of_squares(input: &[i32]) -> i32 { |
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input.iter() |
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.map(|&i| i * i) |
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.sum() |
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} |
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</code></pre> |
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</section> |
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<section> |
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<h3>Rayon</h3> |
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<pre><code> |
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fn sum_of_squares(input: &[i32]) -> i32 { |
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input.par_iter() |
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.map(|&i| i * i) |
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.sum() |
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} |
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</code></pre> |
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</section> |
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<section> |
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<h3>Log-Derive</h3> |
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<pre><code> |
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#[logfn(ok = "TRACE", err = "ERROR")] |
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fn call_isan(num: &str) -> Result<Success, Error> { |
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if num.len() >= 10 && num.len() <= 15 { |
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Ok(Success) |
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} else { |
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Err(Error) |
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} |
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} |
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</code></pre> |
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</section> |
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</section> |
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|
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<section> |
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<section> |
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<h2>E quem usa?</h2> |
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</section> |
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<section> |
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<h3>Magic Pocket</h3> |
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<p>Dropbox</p> |
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<p>Petabyte storage</p> |
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</section> |
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<section> |
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<h3>Servo</h3> |
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<p>Mozilla</p> |
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<p>Base do Firefox Quantum</p> |
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</section> |
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<section> |
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<h3>Azure</h3> |
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<p>Microsoft</p> |
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<p>Usado na parte de IoT do Azure</p> |
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</section> |
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<section> |
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<h3>Tor</h3> |
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</section> |
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</section> |
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|
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<section data-background='_images/thats-all-folks.jpg'> |
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<div class="semi-opaque"> |
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<ul class="empty"> |
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<li>Júlio Biason</li> |
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<li>https://functional.cafe/@juliobiason</li> |
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<li>julio.biason@pm.me</li> |
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<li><a href="http://presentations.juliobiason.net">http://presentations.juliobiason.net</a></li> |
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</ul> |
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</div> |
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</section> |
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</div> |
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</div> |
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