Added QuickSort algorithm in javascript.

Sorting Algorithm/QuickSort.js

@@ -0,0 +1,69 @@
+// Author: Julio Cesar Goldschmidt
+// GitHub: https://github.com/JulioGold
+
+function swap(items, firstIndex, secondIndex){
+    var temp = items[firstIndex];
+    items[firstIndex] = items[secondIndex];
+    items[secondIndex] = temp;
+}
+
+function partition(items, left, right) {
+    let pivot = items[Math.floor((right + left) / 2)];
+    let i = left;
+    let j = right;
+
+    while (i <= j) {
+        while (items[i] < pivot) {
+            i++;
+        }
+
+        while (items[j] > pivot) {
+            j--;
+        }
+
+        if (i <= j) {
+            swap(items, i, j);
+            i++;
+            j--;
+        }
+    }
+
+    return i;
+}
+
+/**
+ * The method sort array with the QuickSort sort algorithm.
+ * @param {Array} array Array of elements to sort.
+ */
+function QuickSort(items, left, right) {
+
+    var index;
+
+    if (items.length > 1) {
+
+        left = typeof left != "number" ? 0 : left;
+        right = typeof right != "number" ? items.length - 1 : right;
+
+        index = partition(items, left, right);
+
+        if (left < index - 1) {
+            QuickSort(items, left, index - 1);
+        }
+
+        if (index < right) {
+            QuickSort(items, index, right);
+        }
+
+    }
+
+    return items;
+}
+
+/**
+ * The main function to run the algorithm.
+ */
+(function main() {
+    let arr = [3, 1, 2, 5, 4];
+    let arrResult = QuickSort(arr);
+    console.log(arrResult.join(','));
+})()