duplicated solutions in loops to match themes

lectures/lec5/p1/task6.js

@@ -1,3 +1,11 @@
 function sum() {
     return arguments.reduce((total, num) => total + num, 0);
 }
+
+function sum() {
+    let total = 0;
+    for (let i = 0; i < arguments.length; i++) {
+        total += arguments[i];
+    }
+    return total;
+}

lectures/lec5/p1/task7.js

@@ -1,3 +1,13 @@
 sum = function(...args)  {
     return args.filter(num => num % 2 !== 0).reduce((acc, num) => acc + num, 0);
 }
+
+sum = function(...args) {
+    let total = 0;
+    for (let num of args) {
+        if (num % 2 !== 0) {
+            total += num;
+        }
+    }
+    return total;
+}

lectures/lec5/p1/task8.js

@@ -1,3 +1,12 @@
 sum = (...args) => {
     return args.filter(num => num % 2 !== 0).reduce((acc, num) => acc + num, 0);
 }
+sum = (...args) => {
+    let total = 0;
+    for (let i = 0; i < args.length; i++) {
+        if (args[i] % 2 !== 0) {
+            total += args[i];
+        }
+    }
+    return total;
+}