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<title>Rust Em 10 Minutos</title>
<meta name="description" content="Por que você deveria aprender Rust">
<meta name="author" content="Julio Biason">
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<div class="reveal">
<div class="slides">
1 year ago
<section data-background="_images/rust-evangelism.jpg" data-header>
<h2 class="semi-opaque">Rust Em 10 Minutos</h2>
</section>
<section>
<h2>
História
<img src="_images/rust-ferris.png" alt="" style="width:100px;margin:0">
</h2>
<ul>
<li>Criada em 2006 por Graydon Hoare.</li>
<li>Patrocinada pela Mozilla em 2009.</li>
<li>Versão 1.0 em 2015.</li>
<li>Versão atual: 1.72</li>
1 year ago
<li class="fragment">Edition: 2021</li>
</ul>
<aside class="notes">
Parte burocrática da apresentação.
PS: Pode ser que, quando você essa apresentação, 1.70
não seja mais a versão atual; a cada 6 semanas, sai uma
nova versão do compilador.
</aside>
</section>
<section>
<img class="stretch" src="_images/40-years-processor-trend.png" alt="">
</section>
<section>
<img class="stretch" src="_images/moores-law-2020.png">
</section>
<section>
<p><a href="https://www.zdnet.com/article/microsoft-70-percent-of-all-security-bugs-are-memory-safety-issues/">Microsoft: 70 percent of all security bugs are memory safety issues</a></p>
<p>(2019)</p>
</section>
<section>
<img src="_images/rust-fearless-concurrency.png"/>
</section>
<section>
<img src="_images/rust-blazingly-fast.png"/>
</section>
<section>
<h2>Green Energy Language</h2>
<img src="_images/rust-energy-full.png" alt="">
<aside class="notes">
Num estudo sobre quais linguagens consomem mais
energia, Rust chegou bem próximo de C.
Parte do trabalho de otimização do Rust vem da LLVM
(parte do pacote do Clang), mas a árvore de
abstração ainda é gerada pela linguagem -- o que
significa que o compilador Rust consegue "ajudar" o
LLVM a otimizar o código.
</aside>
</section>
<section>
<p>
"Speaking of languages, it's time to halt starting any new
projects in C/C++ and use Rust for those scenarios
where a non-GC language is required. For the sake of
security and reliability. the industry should declare
those languages as deprecated"
</p>
<p>
- <a href="https://www.zdnet.com/article/programming-languages-its-time-to-stop-using-c-and-c-for-new-projects-says-microsoft-azure-cto/">Mark Russinovich, Azure CTO</a>, 2022
</p>
</section>
<section>
<img src="_images/how.gif"/>
</section>
<section>
<h2>Borrow Checker</h2>
<h3 class="fragment">(and lifetimes)</h3>
1 year ago
<h2 class="fragment">+ Good Syntax</h2>
<h2 class="fragment">+ Helpful Errors</h2>
</section>
<section>
<pre><code>
fn main() {
let hello = String::from("Hello!");
{
let world = String::from("World!");
println!("{hello} {world}");
}
println!("{hello} {world}");
}
</code></pre>
</section>
<section>
<pre><code>
fn i_own_this_now(s: String) {
println!("Hello {s}!")
}
fn main() {
let name = String::from("Julio");
i_own_this_now(name);
println!("Goodbye {name}");
}
</code></pre>
</section>
<section>
<pre><code>
fn can_i_borrow_it_for_a_second(s: &str) {
println!("Hello {s}");
}
fn main() {
let name = String::from("Julio");
can_i_borrow_it_for_a_second(&name);
println!("Goodbye {name}");
}
</code></pre>
</section>
<section>
<pre><code>
func foo() {
regalo := Gift { .. }
channel &lt;- regalo
regalo.open();
}
</code></pre>
<small class="fragment">
(<a href="https://nikomatsakis.github.io/rust-latam-2019/#29">
Niko Matsakis, RustLatam 2019
</a>)
</small>
</section>
<section>
<img src="_images/rust-languages.png" class="stretch">
<small class="fragment">
(<a href="https://nikomatsakis.github.io/rust-latam-2019/#29">
Niko Matsakis, RustLatam 2019
</a>)
</small>
</section>
<section>
<h2>Good Syntax</h2>
<p>
StackOverflow Survey 2023: "Most Admired Language" <span class="fragment">(84.6%)</span>
</p>
<p class="fragment">
... pelo 8<sup>o</sup> ano seguido.
</p>
</section>
<section>
<h2>Helpful Errors</h2>
<pre><code class="hljs rust" data-trim>
fn main() {
let a = 2;
a = 3;
println!("{}", a);
}
</code></pre>
<aside class="notes">
Primeiro contato com Rust: assim como C, tem uma
função `main`, que pode retornar um inteiro; para
atribuir variáveis, usa-se `let`.
Uma coisa: Rust é "strong and statically typed", o
que sigifnica que a linguagem tem tipos, mas por
padrão o compilador tenta inferir o tipo.
Uma outra forma de escrever o let seria:
```
let a: u8 = 2;
```
</aside>
</section>
<section>
<h2>Helpful Errors</h2>
<pre><code class="hljs" data-trim>
3 | let a = 2;
| -
| |
| first assignment to `a`
| help: make this binding mutable: `mut a`
4 | a = 3;
| ^^^^^ cannot assign twice to immutable variable
</code></pre>
<aside class="notes">
Se você tentar mudar um dado depois de criado, o
compilador Rust não vai deixar.
</aside>
</section>
<section>
<h2>Helpful Errors</h2>
<pre><code class="hljs" data-trim data-line-numbers="7">
3 | let a = 2;
| -
| |
| first assignment to `a`
| help: make this binding mutable: `mut a`
4 | a = 3;
| ^^^^^ cannot assign twice to immutable variable
</code></pre>
<aside class="notes">
... mas se tu olhar com calma, tu vai ver que não só o
compilador disse, claramente, o que era o problema...
</aside>
</section>
<section data-transition="fade">
<h2>Helpful Errors</h2>
<pre><code class="hljs" data-trim data-line-numbers="5">
3 | let a = 2;
| -
| |
| first assignment to `a`
| help: make this binding mutable: `mut a`
4 | a = 3;
| ^^^^^ cannot assign twice to immutable variable
</code></pre>
<aside class="notes">
... como também vai dizer como resolver o problema.
</aside>
</section>
<section>
<img src="_images/around-world.jpg" class="stretch">
</section>
<section>
<h2>Cargo</h2>
<ul>
<li class="fragment">Dependency manager</li>
<li class="fragment">Build tool</li>
1 year ago
<li class="fragment">Test manager</li>
<li class="fragment">Distributable packages</li>
<li class="fragment">Uploader to the registry (crates.io)</li>
</ul>
</section>
1 year ago
<section>
<h2>Crates.io</h2>
<p>"124,474 Crates in stock"</p>
<p class="fragment">
PyPI: "479,236 projects"
<p class="fragment">20 years vs 8</p>
</p>
</section>
<section>
<p>
<span class="fragment"><a href="https://serde.rs/">Serde</a></span>
<span class="fragment" style="float:right"><a href="http://pest.rs/book/">Pest</a></span>
<span class="fragment" style="float:left"><a href="https://ratatui-org.github.io/ratatui-book/index.html">Ratatui</a></span>
</p>
<h2><a href="https://doc.rust-lang.org/book/">The Rust Book</a></h2>
<p>
<span class="fragment"><a href="https://tokio.rs/tokio/tutorial">Tokio</a></span>
<span class="fragment" style="float:left"><a href="https://book.async.rs/">Async-Std</a></span>
<span class="fragment" style="float:right"><a href="https://actix.rs/docs/">Actix</a></span>
</p>
</section>
<section>
<img src="_images/one-more-thing.png" class="stretch" />
</section>
<section>
<h2>
<abbr title="Cybersecurity and Infrastructure Security Agency">CISA</abbr>:
<a href="https://www.cisa.gov/news-events/news/urgent-need-memory-safety-software-products">
The Urgent Need for Memory Safety in Software Products
</a>
</h2>
<small class="fragment">Released: September 20, 2023</small>
</section>
<section data-background='_images/thats-all-folks.jpg'>
</section>
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