Remaining flow control in RBE

rustbyexample/flow_control.d/let_else.rs

@@ -0,0 +1,16 @@
+use std::str::FromStr;
+
+fn get_count_item(s: &str) -> (u64, &str) {
+    let mut it = s.split(' ');
+    let (Some(count_str), Some(item)) = (it.next(), it.next()) else {
+        panic!("Can't segment count item pair: '{s}'");
+    };
+    let Ok(count) = u64::from_str(count_str) else {
+        panic!("Can't parse integer: '{count_str}'");
+    };
+    (count, item)
+}
+
+fn main() {
+    assert_eq!(get_count_item("3 chairs"), (3, "chairs"));
+}

rustbyexample/flow_control.d/while_let.rs

@@ -0,0 +1,13 @@
+fn main() {
+    let mut optional = Some(0);
+
+    while let Some(i) = optional {
+        if i > 9 {
+            println!("Greater than 9, quit!");
+            optional = None;
+        } else {
+            println!("`i` is `{:?}`. Try again.", i);
+            optional = Some(i + 1);
+        }
+    }
+}