Complete "longest common ..." examples (#100)

* no else return

* fix var ref

* fix importing/requiring dependencies

* complete longest common examples

04_quicksort/ES6/01_loop_sum.js

@@ -3,16 +3,12 @@
  * @param {Array} arr Array of numbers
  * @return {number} Sum of the numbers
  */
-const sumLoop = ( arr ) => {
-    let result = 0;
-
-    for ( let i = 0; i < newArr.length; i++ ) {
-        result += newArr[i];
-    }
-
-    return result;
+const sumLoop = arr => {
+  let result = 0;
+  for (let i = 0; i < arr.length; i++) {
+    result += arr[i];
+  }
+  return result;
 };
 
-let arr = [1, 2, 3, 4];
-
-console.log( sumLoop( arr ) ); // 10
+console.log(sumLoop([1, 2, 3, 4])); // 10

04_quicksort/ES6/01_loop_sum_reduce_version.js

@@ -3,14 +3,6 @@
  * @param {Array} arr Array of numbers
  * @return {number} Sum of the numbers
  */
-const sumReduce = ( arr ) => {
-    let result = newArr.reduce( ( curr, prev ) => {
-        return curr + prev;
-    } );
+const sumReduce = arr => arr.reduce((curr, prev) => curr + prev);
 
-    return result;
-};
-
-let arr = [1, 2, 3, 4];
-
-console.log( sumReduce( arr ) ); // 10
+console.log(sumReduce([1, 2, 3, 4])); // 10