feat:exercises

Author: build

exercises/clippy/clippy3.rs

@@ -1,31 +1,26 @@
 // clippy3.rs
-// 
+//
 // Here's a couple more easy Clippy fixes, so you can see its utility.
 //
 // Execute `rustlings hint clippy3` or use the `hint` watch subcommand for a hint.
 
-// I AM NOT DONE
-
 #[allow(unused_variables, unused_assignments)]
 fn main() {
     let my_option: Option<()> = None;
-    if my_option.is_none() {
-        my_option.unwrap();
+    if let Some(x) = my_option {
+        println!("This won't print: {x:?}");
     }
 
-    let my_arr = &[
-        -1, -2, -3
-        -4, -5, -6
-    ];
-    println!("My array! Here it is: {:?}", my_arr);
+    let my_arr = &[-1, -2, -3, -4, -5, -6];
+    println!("My array! Here it is: {my_arr:?}");
 
-    let my_empty_vec = vec![1, 2, 3, 4, 5].resize(0, 5);
-    println!("This Vec is empty, see? {:?}", my_empty_vec);
+    let mut my_empty_vec = vec![1, 2, 3, 4, 5];
+    my_empty_vec.clear();
+    println!("This Vec is empty, see? {my_empty_vec:?}");
 
     let mut value_a = 45;
     let mut value_b = 66;
     // Let's swap these two!
-    value_a = value_b;
-    value_b = value_a;
-    println!("value a: {}; value b: {}", value_a, value_b);
+    std::mem::swap(&mut value_a, &mut value_b);
+    println!("value a: {value_a}; value b: {value_b}");
 }