From 9f0cad54006db7baa48b168978ccc000e5127cad Mon Sep 17 00:00:00 2001
From: AmirReza-alt <amirreza.alt01@gmail.com>
Date: Mon, 4 Aug 2025 11:59:27 +0330
Subject: [PATCH 1/4] add the getSize() method

---
 src/data-structures/linked-list/LinkedList.js | 21 ++++++++++++++++++-
 1 file changed, 20 insertions(+), 1 deletion(-)

diff --git a/src/data-structures/linked-list/LinkedList.js b/src/data-structures/linked-list/LinkedList.js
index ba7d0e3ee1..8a3b6c1111 100644
--- a/src/data-structures/linked-list/LinkedList.js
+++ b/src/data-structures/linked-list/LinkedList.js
@@ -239,7 +239,9 @@ export default class LinkedList {
    * @return {string}
    */
   toString(callback) {
-    return this.toArray().map((node) => node.toString(callback)).toString();
+    return this.toArray()
+      .map((node) => node.toString(callback))
+      .toString();
   }
 
   /**
@@ -269,4 +271,21 @@ export default class LinkedList {
 
     return this;
   }
+
+  /**
+   * Get us the size of the link;
+   * @returns {number}
+   */
+  getSize() {
+    let res = 0;
+    let currNode = this.head;
+
+    // Iterate the entire list.
+    while (currNode) {
+      res++;
+      currNode = currNode.next;
+    }
+
+    return res;
+  }
 }

From 6f6fecc96c440eebfbe8d1060c67b005bf336fd5 Mon Sep 17 00:00:00 2001
From: AmirReza-alt <amirreza.alt01@gmail.com>
Date: Mon, 4 Aug 2025 12:00:19 +0330
Subject: [PATCH 2/4] add the indexOf() method

---
 src/data-structures/linked-list/LinkedList.js | 21 +++++++++++++++++++
 1 file changed, 21 insertions(+)

diff --git a/src/data-structures/linked-list/LinkedList.js b/src/data-structures/linked-list/LinkedList.js
index 8a3b6c1111..a381dd9f62 100644
--- a/src/data-structures/linked-list/LinkedList.js
+++ b/src/data-structures/linked-list/LinkedList.js
@@ -288,4 +288,25 @@ export default class LinkedList {
 
     return res;
   }
+
+  /**
+   * Find the index of the value.
+   * @param {*} value
+   * @returns {number}
+   */
+  indexOf(value) {
+    if (this.getSize() === 0) return -1; // check if the size of list is 0 return -1;
+    let currNode = this.head;
+    let index = 0;
+
+    // Iterate the list to find the value.
+    while (currNode) {
+      if (currNode.value === value) return index;
+      currNode = currNode.next;
+      index++;
+    }
+
+    // if the value dont exist:
+    return -1;
+  }
 }

From 215fb21f0bc5d3f26148c2d20930688357f70df2 Mon Sep 17 00:00:00 2001
From: AmirReza-alt <amirreza.alt01@gmail.com>
Date: Mon, 4 Aug 2025 12:00:48 +0330
Subject: [PATCH 3/4] add the at() method

---
 src/data-structures/linked-list/LinkedList.js | 20 +++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/src/data-structures/linked-list/LinkedList.js b/src/data-structures/linked-list/LinkedList.js
index a381dd9f62..82bb90b006 100644
--- a/src/data-structures/linked-list/LinkedList.js
+++ b/src/data-structures/linked-list/LinkedList.js
@@ -309,4 +309,24 @@ export default class LinkedList {
     // if the value dont exist:
     return -1;
   }
+
+  /**
+   * Find the value of specified index.
+   * @param {number} index
+   * @returns {*}
+   */
+  at(index) {
+    // check if the index not exist
+    if (index < 0 || index > this.getSize()) return undefined;
+    let i = 0;
+    let currNode = this.head;
+
+    // Iterate the list to find the index.
+    while (i < index) {
+      currNode = currNode.next;
+      i++;
+    }
+
+    return currNode.value;
+  }
 }

From 046e803669469e2ae51087e61d7850df3a442a45 Mon Sep 17 00:00:00 2001
From: AmirReza-alt <amirreza.alt01@gmail.com>
Date: Mon, 4 Aug 2025 12:01:10 +0330
Subject: [PATCH 4/4] add the print() method

---
 src/data-structures/linked-list/LinkedList.js | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/src/data-structures/linked-list/LinkedList.js b/src/data-structures/linked-list/LinkedList.js
index 82bb90b006..9c3ea6be5a 100644
--- a/src/data-structures/linked-list/LinkedList.js
+++ b/src/data-structures/linked-list/LinkedList.js
@@ -329,4 +329,23 @@ export default class LinkedList {
 
     return currNode.value;
   }
+  
+  /**
+   * Print the entire list.
+   */
+  print() {
+    if (this.getSize() === 0) return ''; // check if the list size is zero;
+    let res = '';
+    let currNode = this.head;
+
+    // Iterate the list to add values to res variable
+    while (currNode) {
+      res += `${currNode.value} ==> `;
+      currNode = currNode.next;
+    }
+
+    res += `null`;
+
+    console.log(res);
+  }
 }