1 files changed, 16 insertions, 0 deletions
diff --git a/rust/chap4/simple_ref.rs b/rust/chap4/simple_ref.rs
new file mode 100644
index 0000000..968c025
--- /dev/null
+++ b/rust/chap4/simple_ref.rs
@@ -0,0 +1,16 @@
+fn main() {
+    let mut s = String::from("howdy");
+
+    change_me(&mut s);
+
+    let size = get_str_size(&s);
+    println!("Size of s is {size}");
+}
+
+fn get_str_size(s: &String) -> usize {
+    return s.len();
+}
+
+fn change_me(s: &mut String) {
+    s.push_str(", brilha no curintia");
+}