diff --git a/src/arrayMethodSort.js b/src/arrayMethodSort.js
index 32363d0d..d2b25a38 100644
--- a/src/arrayMethodSort.js
+++ b/src/arrayMethodSort.js
@@ -4,8 +4,37 @@
  * Implement method Sort
  */
 function applyCustomSort() {
-  [].__proto__.sort2 = function(compareFunction) {
-    // write code here
+  [].__proto__.sort2 = function (compareFunction) {
+    const arr = this;
+    const len = arr.length;
+
+    for (let i = 0; i < len - 1; i++) {
+      for (let j = 0; j < len - i - 1; j++) {
+        const a = arr[j];
+        const b = arr[j + 1];
+        let shouldSwap = false;
+
+        if (a === undefined && b === undefined) {
+          shouldSwap = false;
+        } else if (a === undefined) {
+          shouldSwap = true;
+        } else if (b === undefined) {
+          shouldSwap = false;
+        } else {
+          if (compareFunction) {
+            shouldSwap = compareFunction(a, b) > 0;
+          } else {
+            shouldSwap = String(a) > String(b);
+          }
+        }
+
+        if (shouldSwap) {
+          [arr[j], arr[j + 1]] = [arr[j + 1], arr[j]];
+        }
+      }
+    }
+
+    return arr;
   };
 }