From 56c43071eb50e21479c8ffb4cb924dd7769f9096 Mon Sep 17 00:00:00 2001
From: Taras Voievoda <voevoda.taras@gmail.com>
Date: Wed, 2 Aug 2023 17:13:15 +0300
Subject: [PATCH 1/3] add task solution

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

diff --git a/src/arrayMethodJoin.js b/src/arrayMethodJoin.js
index 3a62201c1..2d49152fc 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 str = '';
+
+    for (let i = 0; i < this.length; i++) {
+      if (this[i] !== null && this[i] !== undefined) {
+        str += this[i];
+      }
+
+      if (i !== this.length - 1) {
+        str += separator;
+      }
+    }
+
+    return str;
   };
 }
 

From 9c8301e1cab2cc34cd3576905ed207ada734911f Mon Sep 17 00:00:00 2001
From: Taras Voievoda <voevoda.taras@gmail.com>
Date: Mon, 7 Aug 2023 21:13:59 +0300
Subject: [PATCH 2/3] create variable

---
 src/arrayMethodJoin.js | 16 +++++++++-------
 1 file changed, 9 insertions(+), 7 deletions(-)

diff --git a/src/arrayMethodJoin.js b/src/arrayMethodJoin.js
index 2d49152fc..04f4200b4 100644
--- a/src/arrayMethodJoin.js
+++ b/src/arrayMethodJoin.js
@@ -5,19 +5,21 @@
  */
 function applyCustomJoin() {
   [].__proto__.join2 = function(separator = ',') {
-    let str = '';
+    const STRING_SEPARATOR = String(separator);
+    let finalString = '';
 
     for (let i = 0; i < this.length; i++) {
-      if (this[i] !== null && this[i] !== undefined) {
-        str += this[i];
-      }
+      const arrayElement = this[i];
 
-      if (i !== this.length - 1) {
-        str += separator;
+      if (arrayElement === undefined || arrayElement === null) {
+        finalString += STRING_SEPARATOR;
+        continue;
       }
+
+      finalString += arrayElement + STRING_SEPARATOR;
     }
 
-    return str;
+    return finalString.slice(0, finalString.length - STRING_SEPARATOR.length);
   };
 }
 

From 38e919375f96374f24f5fc88c1839b2f157fbaa0 Mon Sep 17 00:00:00 2001
From: Taras Voievoda <voevoda.taras@gmail.com>
Date: Mon, 7 Aug 2023 21:25:51 +0300
Subject: [PATCH 3/3] previous solution

---
 src/arrayMethodJoin.js | 14 +++++++-------
 1 file changed, 7 insertions(+), 7 deletions(-)

diff --git a/src/arrayMethodJoin.js b/src/arrayMethodJoin.js
index 04f4200b4..5f5158c4c 100644
--- a/src/arrayMethodJoin.js
+++ b/src/arrayMethodJoin.js
@@ -5,21 +5,21 @@
  */
 function applyCustomJoin() {
   [].__proto__.join2 = function(separator = ',') {
-    const STRING_SEPARATOR = String(separator);
-    let finalString = '';
+    let finalResult = '';
 
     for (let i = 0; i < this.length; i++) {
       const arrayElement = this[i];
 
-      if (arrayElement === undefined || arrayElement === null) {
-        finalString += STRING_SEPARATOR;
-        continue;
+      if (arrayElement !== null && arrayElement !== undefined) {
+        finalResult += arrayElement;
       }
 
-      finalString += arrayElement + STRING_SEPARATOR;
+      if (i !== this.length - 1) {
+        finalResult += separator;
+      }
     }
 
-    return finalString.slice(0, finalString.length - STRING_SEPARATOR.length);
+    return finalResult;
   };
 }