diff --git a/src/arrayMethodSort.js b/src/arrayMethodSort.js
index 32363d0d..c5836bf4 100644
--- a/src/arrayMethodSort.js
+++ b/src/arrayMethodSort.js
@@ -4,8 +4,61 @@
  * Implement method Sort
  */
 function applyCustomSort() {
-  [].__proto__.sort2 = function(compareFunction) {
-    // write code here
+  [].__proto__.sort2 = function (compareFunction) {
+    const compare =
+      compareFunction ||
+      ((firstElement, secondElement) => {
+        const firstString = String(firstElement);
+        const secondString = String(secondElement);
+
+        if (firstString > secondString) {
+          return 1;
+        }
+
+        if (firstString < secondString) {
+          return -1;
+        }
+
+        return 0;
+      });
+
+    const swap = (leftIndex, rightIndex) => {
+      const temp = this[leftIndex];
+
+      this[leftIndex] = this[rightIndex];
+      this[rightIndex] = temp;
+    };
+
+    const partition = (start, end) => {
+      const pivot = this[end];
+      let smallerElementIndex = start;
+
+      for (let currentIndex = start; currentIndex < end; currentIndex++) {
+        if (compare(this[currentIndex], pivot) <= 0) {
+          swap(smallerElementIndex, currentIndex);
+          smallerElementIndex++;
+        }
+      }
+
+      swap(smallerElementIndex, end);
+
+      return smallerElementIndex;
+    };
+
+    const quickSort = (start, end) => {
+      if (start >= end) {
+        return;
+      }
+
+      const pivotIndex = partition(start, end);
+
+      quickSort(start, pivotIndex - 1);
+      quickSort(pivotIndex + 1, end);
+    };
+
+    quickSort(0, this.length - 1);
+
+    return this;
   };
 }