From 70403b992b528df3c8c7caa4b8cbeb29a4851bac Mon Sep 17 00:00:00 2001
From: Annbpiu <Annbpiu@gmail.com>
Date: Sun, 20 Aug 2023 18:34:19 +0300
Subject: [PATCH 1/2] complete the tusk

---
 src/arrayMethodJoin.js | 24 +++++++++++++++++++++++-
 1 file changed, 23 insertions(+), 1 deletion(-)

diff --git a/src/arrayMethodJoin.js b/src/arrayMethodJoin.js
index 3a62201c..eb1814d0 100644
--- a/src/arrayMethodJoin.js
+++ b/src/arrayMethodJoin.js
@@ -5,7 +5,29 @@
  */
 function applyCustomJoin() {
   [].__proto__.join2 = function(separator) {
-    // write code here
+    if (this.length === 0) {
+      return '';
+    }
+
+    let finalSeparator = separator;
+
+    if (separator === undefined) {
+      finalSeparator = ',';
+    }
+
+    let string = '';
+
+    for (let i = 0; i < this.length; i++) {
+      if (this[i] !== null && this[i] !== undefined) {
+        string += this[i];
+      }
+
+      if (i !== this.length - 1) {
+        string += finalSeparator;
+      }
+    }
+
+    return string;
   };
 }
 

From 142c1a7f3bdb38b5a80e7fa249aa9756c54027ba Mon Sep 17 00:00:00 2001
From: Annbpiu <Annbpiu@gmail.com>
Date: Mon, 21 Aug 2023 12:50:19 +0300
Subject: [PATCH 2/2] fix

---
 src/arrayMethodJoin.js | 14 ++------------
 1 file changed, 2 insertions(+), 12 deletions(-)

diff --git a/src/arrayMethodJoin.js b/src/arrayMethodJoin.js
index eb1814d0..35557402 100644
--- a/src/arrayMethodJoin.js
+++ b/src/arrayMethodJoin.js
@@ -4,17 +4,7 @@
  * Implement method join
  */
 function applyCustomJoin() {
-  [].__proto__.join2 = function(separator) {
-    if (this.length === 0) {
-      return '';
-    }
-
-    let finalSeparator = separator;
-
-    if (separator === undefined) {
-      finalSeparator = ',';
-    }
-
+  [].__proto__.join2 = function(separator = ',') {
     let string = '';
 
     for (let i = 0; i < this.length; i++) {
@@ -23,7 +13,7 @@ function applyCustomJoin() {
       }
 
       if (i !== this.length - 1) {
-        string += finalSeparator;
+        string += separator;
       }
     }