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+Associated functions are an umbrella term for all `fn` declared in an `impl` block.
+A method is just an associated `fn` with `Self` as its first argument but it's not mandatory, for ie constructors or what in PHP would be a static class function.
+
+```rust
+struct Rectangle {
+  width: u32,
+  height: u32,
+}
+
+impl Rectangle {
+  fn area(&self) -> u32 {
+    self.width * self.height
+  }
+
+  fn square(size: u32) -> Rectangle {
+    Rectangle {
+      width: size,
+      height: size,
+    }
+  }
+}
+```
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