Cool things about rust

6 years ago · 3b8d5d9f60
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        </style>
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+<!doctype html>
+<html lang="en">
+    <head>
+        <meta charset="utf-8">
+
+        <title>Rust</title>
+
+        <meta name="description" content="O que Rust tem de legal">
+        <meta name="author" content="Julio Biason">
+
+        <meta name="apple-mobile-web-app-capable" content="yes">
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+        <![endif]-->
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+        <style type="text/css" media="screen">
+            .happy {
+                color: yellow;
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+
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+        </style>
+    </head>
+
+    <body>
+        <div class="reveal">
+            <div class="slides">
+                <section>
+                    <section data-background="_images/rust.png" data-header>
+                        <h1 class="semi-opaque">O Que Rust Tem de Legal</h1>
+                    </section>
+                </section>
+
+				<section>
+					<section>
+						<h2>Borrow Checker</h2>
+					</section>
+
+					<section>
+						<pre><code>
+a = 2
+						</code></pre>
+					</section>
+
+					<section>
+						"Variável <code>a</code> tem o valor 2"
+					</section>
+
+					<section>
+						<div>
+							"Posição de memória apontada por <code>a</code> tem o valor 2"
+						</div>
+
+						<div class="fragment">
+							<pre><code>
+0x3f5cbf89 = 2
+							</code></pre>
+						</div>
+					</section>
+
+					<section>
+						<div>
+							A language that doesn't affect the way you think
+							about programming, is not worth knowing.
+						</div>
+
+						<div>
+							-- Alan Perlis, "ALGOL"
+						</div>
+					</section>
+
+					<section>
+						<pre><code>
+fn main() {
+    let a = String::from("hello");
+    let _b = a;
+    println!("{}", a)
+}
+						</code></pre>
+					</section>
+
+					<section>
+						<pre><code>
+error[E0382]: borrow of moved value: `a`
+ --> src/main.rs:5:20
+  |
+4 |     let _b = a;
+  |              - value moved here
+5 |     println!("{}", a)
+  |                    ^ value borrowed here after move
+  |
+  = note: move occurs because `a` has type `std::string::String`, which does not implement the `Copy` trait
+						</code></pre>
+					</section>
+
+					<section>
+						<pre><code>
+fn main() {
+    let a = 2;
+    let b = a;
+    println!("{}", a);
+    println!("{}", b);
+}
+						</code></pre>
+					</section>
+
+					<section>
+						<pre><code>
+2
+2
+						</code></pre>
+					</section>
+
+					<section>
+						<a href="https://swift.org/blog/swift-5-exclusivity/">Swift 5 Exclusivity Enforcement</a>
+					</section>
+				</section>
+
+				<section>
+					<section>
+						<h2>Imutabilidade por Default</h2>
+					</section>
+
+					<section>
+						<pre><code>
+fn main() {
+    let a = 2;
+    a = 3;
+    println!("{}", a);
+}
+						</code></pre>
+					</section>
+
+					<section>
+						<pre><code>
+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>
+					</section>
+
+					<section>
+						<pre><code>
+fn main() {
+    let mut a = 2;
+    a = 3;
+    println!("{}", a);
+}
+						</code></pre>
+					</section>
+				</section>
+
+				<section>
+					<section>
+						<h2>Enums</h2>
+					</section>
+
+					<section>
+						<pre><code>
+enum IpAddr {
+   V4,
+   V6
+}
+						</code></pre>
+					</section>
+
+					<section>
+						<pre><code>
+enum IpAddr {
+    V4(String),
+    V6(String),
+}
+						</code></pre>
+					</section>
+
+					<section>
+						<pre><code>
+let home = IpAddr::V4(String::from("127.0.0.1");
+
+match home {
+    V4(address) => println!("IPv4 addr: {}", address),
+    V6(address) => println!("Ipv6 addr: {}", address),
+}
+						</code></pre>
+					</section>
+
+					<section>
+						<pre><code>
+enum Option&lt;T&gt; {
+    Some(T),
+    None
+}
+						</code></pre>
+					</section>
+				</section>
+
+				<section>
+					<section>
+						<h2>Error Control</h2>
+					</section>
+
+					<section>
+						<pre><code>
+try:
+    something()
+except Exception:
+    pass
+						</code></pre>
+					</section>
+
+					<section>
+						<pre><code>
+try {
+   something();
+} catch (Exception ex) {
+   System.out.println(ex);
+}
+						</code></pre>
+					</section>
+
+					<section>
+						<pre><code>
+FILE* f = fopen("someting.txt", "wb");
+fprintf(f, "Done!");
+fclose(f);
+						</code></pre>
+					</section>
+
+					<section>
+						<div>
+							Onde o erro foi tratado nisso?
+						</div>
+					</section>
+
+					<section>
+						<pre><code>
+enum Result&lt;T, E&gt; {
+    Ok(T),
+    Err(E),
+}
+						</code></pre>
+					</section>
+
+					<section>
+						<pre><code>
+File::create("something.txt") match {
+    Ok(fp) => fp.write_all(b"Hello world"),
+    Err(err) => println!("Failure! {}", err),
+}
+						</code></pre>
+					</section>
+
+					<section>
+						<pre><code>
+File::create("something.txt") match {
+    Ok(fp) => fp.write_all(b"Hello world") match {
+        Ok(_) => (),
+        Err(err) => println!("Can't write! {}", err),
+    }
+    Err(err) => println!("Failure! {}", err),
+}
+						</code></pre>
+					</section>
+
+                    <section>
+                        <pre><code>
+let mut file = File::create("something.txt).unwrap();
+file.write(b"Hello world").unwrap();
+                        </code></pre>
+                    </section>
+
+                    <section>
+                        <pre><code>
+let mut file = File::create("something.txt)?;
+file.write(b"Hello world")?;
+OK(())
+                        </code></pre>
+                    </section>
+				</section>
+
+                <section data-background='_images/thats-all-folks.jpg'>
+				</section>
+            </div>
+        </div>
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