freeCodeCamp/curriculum/challenges/en/08-coding-interview-prep/data-structures/search-within-a-linked-list.en.md

---
id: 587d8251367417b2b2512c64
title: Search within a Linked List
challengeType: 1
---

## Description
<section id='description'>
Let's add a few more useful methods to our linked list class. Wouldn't it be useful if we could tell if our list was empty or not, as with our <code>Stack</code> and <code>Queue</code> classes?
We should also be able to find specific elements in our linked list. Traversing through data structures is something you'll want to get a lot of practice with! Let's create an <code>indexOf</code> method that takes an <code>element</code> as an argument, and returns that element's <code>index</code> in the linked list. If the element is not found in the linked list, return <code>-1</code>.
Let's also implement a method that does the opposite: an <code>elementAt</code> method that takes an <code>index</code> as an argument and returns the <code>element</code> at the given <code>index</code>. If no <code>element</code> is found, return <code>undefined</code>.
</section>

## Instructions
<section id='instructions'>
Write an <code>isEmpty</code> method that checks if the linked list is empty, an <code>indexOf</code> method that returns the <code>index</code> of a given element, and an <code>elementAt</code> that returns an <code>element</code> at a given <code>index.
</section>

## Tests
<section id='tests'>

```yml
- text: Your <code>LinkedList</code> class should have a <code>indexOf</code> method.
  testString: 'assert((function(){var test = new LinkedList(); return (typeof test.indexOf === ''function'')}()), ''Your <code>LinkedList</code> class should have a <code>indexOf</code> method.'');'
- text: Your <code>LinkedList</code> class should have a <code>elementAt</code> method.
  testString: 'assert((function(){var test = new LinkedList(); return (typeof test.elementAt === ''function'')}()), ''Your <code>LinkedList</code> class should have a <code>elementAt</code> method.'');'
- text: Your <code>size</code> method should return the length of the linked list
  testString: 'assert((function(){var test = new LinkedList(); test.add(''cat''); test.add(''dog''); test.add(''kitten''); return test.size() === 3}()), ''Your <code>size</code> method should return the length of the linked list'');'
- text: Your <code>indexOf</code> method should return the index of the given element.
  testString: 'assert((function(){var test = new LinkedList(); test.add(''cat''); test.add(''dog''); test.add(''kitten''); return test.indexOf(''kitten'') === 2}()), ''Your <code>indexOf</code> method should return the index of the given element.'');'
- text: Your <code>elementAt</code> method should return at element at a given index.
  testString: 'assert((function(){var test = new LinkedList(); test.add(''cat''); test.add(''dog''); test.add(''kitten''); return test.elementAt(1) === ''dog''}()), ''Your <code>elementAt</code> method should return at element at a given index.'');'

```

</section>

## Challenge Seed
<section id='challengeSeed'>

<div id='js-seed'>

```js
function LinkedList() { 
  var length = 0; 
  var head = null; 

  var Node = function(element){ // {1} 
    this.element = element; 
    this.next = null; 
  }; 

  this.size = function() {
    return length;
  };

  this.head = function(){
    return head;
  };

  this.add = function(element){
    var node = new Node(element);
    if(head === null){
        head = node;
    } else {
        currentNode = head;

        while(currentNode.next){
            currentNode  = currentNode.next;
        }

        currentNode.next = node;
    }

    length++;
  }; 

  this.remove = function(element){
    var currentNode = head;
    var previousNode;
    if(currentNode.element === element){
        head = currentNode.next;
    } else {
        while(currentNode.element !== element) {
            previousNode = currentNode;
            currentNode = currentNode.next;
        }

        previousNode.next = currentNode.next;
    }

    length --;
  };

  // Only change code below this line

  // Only change code above this line
}
```

</div>



</section>

## Solution
<section id='solution'>

```js
// solution required
```
</section>