From 9d4f5b661ba8a1ef199755f95c78427bf0a301ca Mon Sep 17 00:00:00 2001
From: Dan Buch <dan@meatballhat.com>
Date: Sat, 30 Sep 2023 20:05:41 -0400
Subject: [PATCH] Up through fn methods in RBE

---
 rustbyexample/.gitignore      |  9 ++---
 rustbyexample/fn.d/methods.rs | 74 +++++++++++++++++++++++++++++++++++
 rustbyexample/fn.rs           | 29 ++++++++++++++
 3 files changed, 106 insertions(+), 6 deletions(-)
 create mode 100644 rustbyexample/fn.d/methods.rs
 create mode 100644 rustbyexample/fn.rs

diff --git a/rustbyexample/.gitignore b/rustbyexample/.gitignore
index 307d7d8..977aaeb 100644
--- a/rustbyexample/.gitignore
+++ b/rustbyexample/.gitignore
@@ -1,6 +1,3 @@
-*.d/out
-*.d/**/out
-expression
-hello
-primitives
-variable_bindings
+/out/
+/*.d/out
+/*.d/**/out
diff --git a/rustbyexample/fn.d/methods.rs b/rustbyexample/fn.d/methods.rs
new file mode 100644
index 0000000..6c5b7a1
--- /dev/null
+++ b/rustbyexample/fn.d/methods.rs
@@ -0,0 +1,74 @@
+struct Point {
+    x: f64,
+    y: f64,
+}
+
+impl Point {
+    fn origin() -> Point {
+        Point { x: 0.0, y: 0.0 }
+    }
+
+    fn new(x: f64, y: f64) -> Point {
+        Point { x: x, y: y }
+    }
+}
+
+struct Rectangle {
+    p1: Point,
+    p2: Point,
+}
+
+impl Rectangle {
+    fn area(&self) -> f64 {
+        let Point { x: x1, y: y1 } = self.p1;
+        let Point { x: x2, y: y2 } = self.p2;
+
+        ((x1 - x2) * (y1 - y2)).abs()
+    }
+
+    fn perimeter(&self) -> f64 {
+        let Point { x: x1, y: y1 } = self.p1;
+        let Point { x: x2, y: y2 } = self.p2;
+
+        2.0 * ((x1 - x2).abs() + (y1 - y2).abs())
+    }
+
+    fn translate(&mut self, x: f64, y: f64) {
+        self.p1.x += x;
+        self.p2.x += x;
+
+        self.p1.y += y;
+        self.p2.y += y;
+    }
+}
+
+struct Pair(Box<i32>, Box<i32>);
+
+impl Pair {
+    fn destroy(self) {
+        let Pair(first, second) = self;
+
+        println!("Destroying Pair({}, {})", first, second);
+    }
+}
+
+fn main() {
+    let rectangle = Rectangle {
+        p1: Point::origin(),
+        p2: Point::new(3.0, 4.0),
+    };
+
+    println!("Rectangle perimeter: {}", rectangle.perimeter());
+    println!("Rectangle area: {}", rectangle.area());
+
+    let mut square = Rectangle {
+        p1: Point::origin(),
+        p2: Point::new(1.0, 1.0),
+    };
+
+    square.translate(1.0, 1.0);
+
+    let pair = Pair(Box::new(1), Box::new(2));
+
+    pair.destroy();
+}
diff --git a/rustbyexample/fn.rs b/rustbyexample/fn.rs
new file mode 100644
index 0000000..c1e3faf
--- /dev/null
+++ b/rustbyexample/fn.rs
@@ -0,0 +1,29 @@
+fn main() {
+    fizzbuzz_to(100);
+}
+
+fn is_divisible_by(lhs: u32, rhs: u32) -> bool {
+    if rhs == 0 {
+        return false;
+    }
+
+    lhs % rhs == 0
+}
+
+fn fizzbuzz(n: u32) -> () {
+    if is_divisible_by(n, 15) {
+        println!("fizzbuzz");
+    } else if is_divisible_by(n, 3) {
+        println!("fizz");
+    } else if is_divisible_by(n, 5) {
+        println!("buzz");
+    } else {
+        println!("{}", n);
+    }
+}
+
+fn fizzbuzz_to(n: u32) {
+    for n in 1..=n {
+        fizzbuzz(n);
+    }
+}