initial, up to chapter 9

.gitignore

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+/target

Cargo.lock

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+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+[[package]]
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+
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+dependencies = [
+ "cfg-if",
+ "libc",
+ "wasi",
+]
+
+[[package]]
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+dependencies = [
+ "getrandom",
+ "libc",
+ "rand_chacha",
+ "rand_core",
+ "rand_hc",
+]
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+[[package]]
+name = "rusty-playground"
+version = "0.1.0"
+dependencies = [
+ "rand",
+]
+
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Cargo.toml

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+[package]
+name = "rusty-playground"
+version = "0.1.0"
+authors = ["aj <andrewjpack@gmail.com>"]
+edition = "2018"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+rand = "0.7.3"

README.md

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+Rusty Playground
+==================
+
+Playing around with rust, writing a reference doc

src/collections.rs

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+
+fn hello_world(){
+    
+}

src/main.rs

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+use std::io;
+use std::cmp::Ordering;
+use rand::Rng;
+
+mod collections;
+
+fn main() {
+    basics();
+    compare();
+    loops();
+    vars();
+    compound();
+
+    println!("testing returns: {}", returning(2));
+    strings();
+    nullables();
+}
+
+fn basics() { 
+    // ! indicates a macro not a func
+    println!("Enter a number: ");
+
+    // mut defines a mutable variable
+    let mut input = String::new();
+
+    io::stdin()
+        .read_line(&mut input)
+        // nice error handling wrapper on Result from read_line
+        .expect("Failed to read line");
+    
+    // shadow previously defined variable
+    // i32, u32, i64 (u = unsigned)
+    let input: u32 = match input.trim() // std str trim (\n)
+                                .parse() // infers what to parse to using type annotation
+    {
+        Ok(num) => num,
+        Err(_) => 0,
+    };
+
+    println!("You entered: {}", input);
+    
+    // thread local random number gener
+    let r_num = rand::thread_rng().gen_range(1, 101);
+    println!("random number: {}", r_num);
+
+    let vec = build_vector3(1, 2, 3);
+    println!("Vector: {}/{}/{}", vec.x, vec.y, vec.z);
+    let vec2 = update_x(vec);
+    println!("Vector2: {:#?}", vec2)
+}
+
+fn compare() {
+    let first = 5;
+    let second = 6;
+
+    match first.cmp(&second) {
+        Ordering::Less => println!("Smaller"),
+        Ordering::Greater => println!("Bigger"),
+        Ordering::Equal => println!("Equal"),
+    }
+}
+
+fn loops() {
+    let var = 2;
+    loop {
+        println!("Looping!");
+        
+        if var == 2 {
+            break;
+        }
+    }
+
+    println!("Done with loop");
+
+    let mut count = 0;
+    let mut result = loop {
+        count += 1;
+
+        if count == 4 {
+            break count *6;
+        }
+    };
+
+    while result != 0 {
+        result -= 1;
+    }
+
+    let iterables = [1, 2, 3, 4];
+    for el in iterables.iter() {
+        println!("iterable value: {}", el);
+    }
+
+    // 6 exclusive
+    for num in (1..6).rev() {
+        println!("ranged values: {}", num);
+    }
+}
+
+fn vars() {
+    // must be type annotated
+    const X: i32 = 3_000_000;
+    println!("const: {}", X);
+
+    // suffix type on a scalar literal
+    let _literal = 28u8;
+    let _f = 2.0; // defaults to 64 bit
+}
+
+fn compound() {
+    let tup = (500, 'a');
+    let (_, second) = tup;
+    println!("tuple: {}/{}", tup.0, second);
+
+    let _arr: [u8; 4] = [1, 2, 3, 4];
+    let repeater = [3; 5]; // stretches to 5 elements of 3
+    println!("Retrieving from array: {}", repeater[3]);
+}
+
+fn returning(input: i32) -> i32 {
+    let _stuff = 0;
+
+    let condition = true;
+    let number = if condition { 5 } else { 6 };
+    println!("The value of number is: {}", number);
+
+    input + 1 // no semicolon, return value
+}
+
+fn strings() {
+    let mut s = String::from("hello");
+    s.push_str(", world!");
+    println!("Sliced: {}", &s[4..8]);
+}
+
+#[derive(Debug)]
+struct Vector3 {
+    x: i32,
+    y: i32,
+    z: i32,
+}
+
+impl Vector3 {
+    fn dot(&self, other: &Vector3) -> i32 {
+        self.x * other.x
+        +
+        self.y * other.y
+        +
+        self.z * other.z
+    }
+}
+
+fn build_vector3(x: i32, y: i32, z: i32) -> Vector3 {
+    Vector3 {
+        x, y, z
+    }
+}
+
+fn update_x(vec: Vector3) -> Vector3 {
+    Vector3 {
+        x: 5,
+        ..vec
+    }
+}
+
+enum ColourChannel {
+    Red,
+    Green,
+    Blue
+}
+
+enum IpAddr {
+    V4(u8, u8, u8, u8),
+    V6(String),
+}
+
+fn nullables() {
+    let _some_number = Some(5);
+    let _some_string = Some("a string");
+
+    let _absent_number: Option<i32> = None;
+}