very late init

src/bin/1-2-vector-math.rs

@@ -0,0 +1,51 @@
+// this is just me making a add vec func where
+// it retains the order for add or subtracting
+// and vec1 and vec2 can be different sizes
+fn add_vec(vec1: &Vec<i32>, vec2: &Vec<i32>) -> Vec<i32> {
+    //return vec![vec1[0]+vec2[0],vec1[1]+vec2[1]];
+    let mut len=vec1.len();
+    let mut sumvec: Vec<i32> = vec1.to_vec();
+    let addvec: Vec<i32> = vec2.to_vec();
+    if vec1.len() < vec2.len() { 
+        len = vec2.len();
+    }
+
+    for i in 0..len {
+        if let Some(_) = vec2.get(i) {
+            if let Some(_) = vec1.get(i) {
+                sumvec[i] = sumvec[i] + addvec[i]
+            } else {
+                sumvec.push(vec2[i])
+            }
+        }
+    }
+
+    return sumvec;
+}
+
+fn sub_vec(vec1: &Vec<i32>, vec2: &Vec<i32>) -> Vec<i32> {
+    let mut len=vec1.len();
+    let mut sumvec: Vec<i32> = vec1.to_vec();
+    let addvec: Vec<i32> = vec2.to_vec();
+    if vec1.len() < vec2.len() { 
+        len = vec2.len();
+    }
+
+    for i in 0..len {
+        if let Some(_) = vec2.get(i) {
+            if let Some(_) = vec1.get(i) {
+                sumvec[i] = sumvec[i] - addvec[i]
+            } else {
+                sumvec.push(vec2[i])
+            }
+        }
+    }
+
+    return sumvec;
+}
+
+fn main() {
+    println!("{:?}", add_vec(&vec![2,4, -1, 4, 10], &vec![1,-1,-4]));
+    println!("{:?}", add_vec(&vec![1,1], &vec![1,-1,-4,3]));
+    println!("{:?}", sub_vec(&vec![2, -1], &vec![1,1,-4]));
+}