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authorP1start <rewi-github@whanau.org>2014-06-30 16:41:13 +1200
committerP1start <rewi-github@whanau.org>2014-06-30 16:44:08 +1200
commit83283c0d4ca5f797e505f511b418c3a2f6472d8c (patch)
treed748afd5c2e849f246af6005a491e130ee585444 /rust.html.markdown
parent17a1303e37190573fee767c02bd4f87bb70783cf (diff)
[rust/en] Add an English Rust tutorial
Fixes #480.
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+---
+language: rust
+contributors:
+ - ["P1start", "http://p1start.github.io/"]
+filename: learnrust.rs
+---
+
+Rust is an in-development programming language developed by Mozilla Research.
+It is relatively unique among systems languages in that it can assert memory
+safety *at compile time*. Rust’s first alpha release occurred in January
+2012, and development moves so quickly that at the moment the use of stable
+releases is discouraged, and instead one should use nightly builds.
+
+Although Rust is a relatively low-level language, Rust has some functional
+concepts that are generally found in higher-level languages. This makes
+Rust not only fast, but also easy and efficient to code in.
+
+```rust
+// This is a comment. Single-line look like this...
+/* ...and multi-line comment look like this */
+
+///////////////
+// 1. Basics //
+///////////////
+
+// Functions
+fn add2(x: int, y: int) -> int {
+ // Implicit return (no semicolon)
+ x + y
+}
+
+// Main function
+fn main() {
+ // Numbers //
+
+ // Immutable bindings
+ let x: int = 1;
+
+ // Integer/float suffixes
+ let y: int = 13i;
+ let f: f64 = 1.3f64;
+
+ // Type inference
+ let implicit_x = 1i;
+ let implicit_f = 1.3f64;
+
+ // Maths
+ let sum = x + y + 13i;
+
+ // Mutable variable
+ let mut mutable = 1;
+ mutable += 2;
+
+ // Strings //
+
+ // String literals
+ let x: &'static str = "hello world!";
+
+ // Printing
+ println!("{} {}", f, x); // 1.3 hello world
+
+ // A `String`
+ let s: String = "hello world".to_string();
+
+ // A string slice - a view into another string
+ let s_slice: &str = s.as_slice();
+
+ //////////////
+ // 2. Types //
+ //////////////
+
+ // Struct
+ struct Point {
+ x: int,
+ y: int,
+ }
+
+ let origin: Point = Point { x: 0, y: 0 };
+
+ // Tuple struct
+ struct Point2(int, int);
+
+ let origin2 = Point2(0, 0);
+
+ // Basic C-like enum
+ enum Direction {
+ Left,
+ Right,
+ Up,
+ Down,
+ }
+
+ let up = Up;
+
+ // Enum with fields
+ enum OptionalInt {
+ AnInt(int),
+ Nothing,
+ }
+
+ let two: OptionalInt = AnInt(2);
+ let nothing: OptionalInt = Nothing;
+
+ // Generics //
+
+ struct Foo<T> { bar: T }
+
+ // This is defined in the standard library as `Option`
+ enum Optional<T> {
+ SomeVal(T),
+ NoVal,
+ }
+
+ // Methods //
+
+ impl<T> Foo<T> {
+ // Methods take an explicit `self` parameter
+ fn get_bar(self) -> T {
+ self.bar
+ }
+ }
+
+ let a_foo = Foo { bar: 1i };
+ println!("{}", a_foo.get_bar()); // 1
+
+ // Traits (interfaces) //
+
+ trait Frobnicate<T> {
+ fn frobnicate(self) -> Option<T>;
+ }
+
+ impl<T> Frobnicate<T> for Foo<T> {
+ fn frobnicate(self) -> Option<T> {
+ Some(self.bar)
+ }
+ }
+
+ println!("{}", a_foo.frobnicate()); // Some(1)
+
+ /////////////////////////
+ // 3. Pattern matching //
+ /////////////////////////
+
+ let foo = AnInt(1);
+ match foo {
+ AnInt(n) => println!("it’s an int: {}", n),
+ Nothing => println!("it’s nothing!"),
+ }
+
+ // Advanced pattern matching
+ struct FooBar { x: int, y: OptionalInt }
+ let bar = FooBar { x: 15, y: AnInt(32) };
+
+ match bar {
+ FooBar { x: 0, y: AnInt(0) } =>
+ println!("The numbers are zero!"),
+ FooBar { x: n, y: AnInt(m) } if n == m =>
+ println!("The numbers are the same"),
+ FooBar { x: n, y: AnInt(m) } =>
+ println!("Different numbers: {} {}", n, m),
+ FooBar { x: _, y: Nothing } =>
+ println!("The second number is Nothing!"),
+ }
+
+ /////////////////////
+ // 4. Control flow //
+ /////////////////////
+
+ // `for` loops/iteration
+ let array = [1i, 2, 3];
+ for i in array.iter() {
+ println!("{}", i);
+ }
+
+ for i in range(0u, 10) {
+ print!("{} ", i);
+ }
+ println!("");
+ // prints `0 1 2 3 4 5 6 7 8 9 `
+
+ // `if`
+ if 1i == 1 {
+ println!("Maths is working!");
+ } else {
+ println!("Oh no...");
+ }
+
+ // `if` as expression
+ let value = if true {
+ "good"
+ else {
+ "bad"
+ };
+
+ // `while` loop
+ while 1i == 1 {
+ println!("The universe is operating normally.");
+ }
+
+ // Infinite loop
+ loop {
+ println!("Hello!");
+ }
+
+ /////////////////////////////////
+ // 5. Memory safety & pointers //
+ /////////////////////////////////
+
+ // Owned pointer - only one thing can ‘own’ this pointer at a time
+ let mut mine: Box<int> = box 3;
+ *mine = 5; // dereference
+ let mut now_its_mine = mine;
+ *now_its_mine += 2;
+ println!("{}", now_its_mine); // 7
+ // println!("{}", mine); // this would error
+
+ // Reference - an immutable pointer that refers to other data
+ let mut var = 4i;
+ var = 3;
+ let ref_var: &int = &var;
+ println!("{}", var); // Unlike `box`, `var` can still be used
+ println!("{}", *ref_var);
+ // var = 5; // this would error
+ // *ref_var = 6; // this would too
+
+ // Mutable reference
+ let mut var2 = 4i;
+ let ref_var2: &mut int = &mut var2;
+ *ref_var2 += 2;
+ println!("{}", *ref_var2); // 6
+ // var2 = 2; // this would error
+}
+```
+
+## Further reading
+
+There’s a lot more to Rust—this is just the basics of Rust so you can
+understand the most important things. To learn more about Rust, read the
+[Rust tutorial](http://doc.rust-lang.org/tutorial.html) and check out the
+[/r/rust](http://reddit.com/r/rust) subreddit. The folks on the #rust channel
+on irc.mozilla.org are also always keen to help newcomers.
+
+You can also try out features of Rust with an online compiler at the official
+[Rust playpen](http://play.rust-lang.org) or on the main
+[Rust website](http://rust-lang.org).