Solution

src/arrayMethodSort.js

@@ -4,8 +4,38 @@
  * Implement method Sort
  */
 function applyCustomSort() {
-  [].__proto__.sort2 = function(compareFunction) {
-    // write code here
+  [].__proto__.sort2 = function (compareFunction) {
+    let callback = compareFunction;
+
+    if (!compareFunction) {
+      callback = (item1, item2) => {
+        const strItem1 = String(item1);
+        const strItem2 = String(item2);
+
+        if (strItem1 > strItem2) {
+          return 1;
+        }
+
+        if (strItem1 < strItem2) {
+          return -1;
+        }
+
+        return 0;
+      };
+    }
+
+    for (let i = 0; i < this.length; i++) {
+      for (let j = 0; j < this.length - 1; j++) {
+        if (callback(this[j], this[j + 1]) > 0) {
+          const temp = this[j];
+
+          this[j] = this[j + 1];
+          this[j + 1] = temp;
+        }
+      }
+    }
+
+    return this;
   };
 }