From bf0990eda2d2636cb72ca1cfc7b9adb30fb3315b Mon Sep 17 00:00:00 2001
From: Patryk-Buczkowski <patryk.buczkowski@outlook.com>
Date: Wed, 16 Aug 2023 17:35:43 +0200
Subject: [PATCH] solution

---
 src/arrayMethodJoin.js | 16 ++++++++++++++--
 1 file changed, 14 insertions(+), 2 deletions(-)

diff --git a/src/arrayMethodJoin.js b/src/arrayMethodJoin.js
index 3a62201c..49a0b630 100644
--- a/src/arrayMethodJoin.js
+++ b/src/arrayMethodJoin.js
@@ -4,8 +4,20 @@
  * Implement method join
  */
 function applyCustomJoin() {
-  [].__proto__.join2 = function(separator) {
-    // write code here
+  [].__proto__.join2 = function(separator = ',') {
+    let result = '';
+
+    for (let i = 0; i < this.length; i++) {
+      if (this[i] !== null && this[i] !== undefined) {
+        result += this[i];
+      }
+
+      if (i < this.length - 1) {
+        result += separator;
+      }
+    }
+
+    return result;
   };
 }