structs and methods

methods/src/main.rs

@@ -0,0 +1,37 @@
+struct Rectangle {
+    w: u32,
+    h: u32,
+}
+
+impl Rectangle {
+    fn area(&self) -> u32 {
+        self.w * self.h
+    }
+
+    fn can_hold(&self, vs: &Rectangle) -> bool {
+        self.w > vs.w && self.h > vs.h
+    }
+
+    fn square(size: u32) -> Self {
+        Self { w: size, h: size }
+    }
+}
+
+fn main() {
+    let rect1 = Rectangle { w: 30, h: 50 };
+    let rect2 = Rectangle { w: 10, h: 40 };
+    let rect3 = Rectangle { w: 60, h: 45 };
+
+    println!("Can rect1 hold rect2? {}", rect1.can_hold(&rect2));
+    println!("Can rect1 hold rect3? {}", rect1.can_hold(&rect3));
+
+    println!("---\nMethod calls are syntactic sugar for functions:");
+    println!(
+        "in other words,
+        rect1.area() which gives {}
+        is the same as 
+        Rectangle::area(&rect1) which gives {}",
+        rect1.area(),
+        Rectangle::area(&rect1)
+    );
+}