PNG -> JPG

exercises/move_semantics/move_semantics1.rs

@@ -1,12 +1,10 @@
 // move_semantics1.rs
 // Execute `rustlings hint move_semantics1` or use the `hint` watch subcommand for a hint.
 
-// I AM NOT DONE
-
 fn main() {
     let vec0 = Vec::new();
 
-    let vec1 = fill_vec(vec0);
+    let mut vec1 = fill_vec(vec0);
 
     println!("{} has length {} content `{:?}`", "vec1", vec1.len(), vec1);
 
@@ -16,11 +14,9 @@ fn main() {
 }
 
 fn fill_vec(vec: Vec<i32>) -> Vec<i32> {
-    let mut vec = vec;
-
-    vec.push(22);
-    vec.push(44);
-    vec.push(66);
-
-    vec
+    let mut vec_x = vec;
+    vec_x.push(22);
+    vec_x.push(44);
+    vec_x.push(66);
+    vec_x
 }

exercises/vecs/vecs1.rs

@@ -4,12 +4,9 @@
 // Make me compile and pass the test!
 // Execute `rustlings hint vecs1` or use the `hint` watch subcommand for a hint.
 
-// I AM NOT DONE
-
 fn array_and_vec() -> ([i32; 4], Vec<i32>) {
     let a = [10, 20, 30, 40]; // a plain array
-    let v = // TODO: declare your vector here with the macro for vectors
-
+    let v = vec![10, 20, 30, 40];
     (a, v)
 }
 

exercises/vecs/vecs2.rs

@@ -6,25 +6,24 @@
 //
 // Execute `rustlings hint vecs2` or use the `hint` watch subcommand for a hint.
 
-// I AM NOT DONE
 
-fn vec_loop(mut v: Vec<i32>) -> Vec<i32> {
+fn vec_loop(v: &mut Vec<i32>){
     for i in v.iter_mut() {
         // TODO: Fill this up so that each element in the Vec `v` is
         // multiplied by 2.
-        ???
+        *i = *i * 2
     }
-
     // At this point, `v` should be equal to [4, 8, 12, 16, 20].
-    v
 }
 
 fn vec_map(v: &Vec<i32>) -> Vec<i32> {
-    v.iter().map(|num| {
-        // TODO: Do the same thing as above - but instead of mutating the
-        // Vec, you can just return the new number!
-        ???
-    }).collect()
+    v.iter()
+        .map(|num| {
+            // TODO: Do the same thing as above - but instead of mutating the
+            // Vec, you can just return the new number!
+            num * 2
+        })
+        .collect()
 }
 
 #[cfg(test)]
@@ -33,10 +32,11 @@ mod tests {
 
     #[test]
     fn test_vec_loop() {
-        let v: Vec<i32> = (1..).filter(|x| x % 2 == 0).take(5).collect();
-        let ans = vec_loop(v.clone());
+        let a: Vec<i32> = (1..).filter(|x| x % 2 == 0).take(5).collect();
+        let mut v: Vec<i32> = (1..).filter(|x| x % 2 == 0).take(5).collect();
+        vec_loop(&mut v);
 
-        assert_eq!(ans, v.iter().map(|x| x * 2).collect::<Vec<i32>>());
+        assert_eq!(v, a.iter().map(|x| x * 2).collect::<Vec<i32>>());
     }
 
     #[test]