diff --git a/src/arrayMethodSort.js b/src/arrayMethodSort.js
index 32363d0d..d04391e8 100644
--- a/src/arrayMethodSort.js
+++ b/src/arrayMethodSort.js
@@ -4,8 +4,48 @@
  * Implement method Sort
  */
 function applyCustomSort() {
-  [].__proto__.sort2 = function(compareFunction) {
-    // write code here
+  [].__proto__.sort2 = function (compareFunction) {
+    // const newArray = [];
+    let compare = compareFunction;
+    const result = [];
+    const undefinedNumber = [];
+
+    if (typeof compare !== 'function') {
+      compare = (a, b) =>
+        String(a) > String(b) ? 1 : String(a) < String(b) ? -1 : 0;
+    }
+
+    for (let i = 0; i < this.length - 1; i++) {
+      for (let j = i + 1; j < this.length; j++) {
+        if (this[i] === undefined) {
+          continue;
+        }
+
+        if (this[j] === undefined) {
+          continue;
+        }
+
+        if (compare(this[i], this[j]) > 0) {
+          [this[i], this[j]] = [this[j], this[i]];
+        }
+      }
+    }
+
+    for (let i = 0; i < this.length; i++) {
+      if (this[i] !== undefined) {
+        result[result.length] = this[i];
+      } else {
+        undefinedNumber[undefinedNumber.length] = this[i];
+      }
+    }
+
+    const sorted = [...result, ...undefinedNumber];
+
+    for (let i = 0; i < sorted.length; i++) {
+      this[i] = sorted[i];
+    }
+
+    return this;
   };
 }