92 lines
1.9 KiB
Markdown
92 lines
1.9 KiB
Markdown
|
---
|
||
|
id: 587d8252367417b2b2512c67
|
||
|
title: Add Elements at a Specific Index in a Linked List
|
||
|
challengeType: 1
|
||
|
videoUrl: ''
|
||
|
localeTitle: ''
|
||
|
---
|
||
|
|
||
|
## Description
|
||
|
undefined
|
||
|
|
||
|
## Instructions
|
||
|
undefined
|
||
|
|
||
|
## Tests
|
||
|
<section id='tests'>
|
||
|
|
||
|
```yml
|
||
|
tests:
|
||
|
- text: ''
|
||
|
testString: 'assert((function(){var test = new LinkedList(); test.add("cat"); test.add("dog"); test.addAt(0,"cat"); return test.head().element === "cat"}()), "Your <code>addAt</code> method should reassign <code>head</code> to the new node when the given index is 0.");'
|
||
|
- text: ''
|
||
|
testString: 'assert((function(){var test = new LinkedList(); test.add("cat"); test.add("dog"); test.addAt(0,"cat"); return test.size() === 3}()), "Your <code>addAt</code> method should increase the length of the linked list by one for each new node added to the linked list.");'
|
||
|
- text: ''
|
||
|
testString: 'assert((function(){var test = new LinkedList(); test.add("cat"); test.add("dog"); return (test.addAt(4,"cat") === false); }()), "Your <code>addAt</code> method should return <code>false</code> if a node was unable to be added.");'
|
||
|
|
||
|
```
|
||
|
|
||
|
</section>
|
||
|
|
||
|
## Challenge Seed
|
||
|
<section id='challengeSeed'>
|
||
|
|
||
|
<div id='js-seed'>
|
||
|
|
||
|
```js
|
||
|
function LinkedList() {
|
||
|
var length = 0;
|
||
|
var head = null;
|
||
|
|
||
|
var Node = function(element){
|
||
|
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++;
|
||
|
};
|
||
|
|
||
|
// Only change code below this line
|
||
|
|
||
|
// Only change code above this line
|
||
|
|
||
|
}
|
||
|
|
||
|
```
|
||
|
|
||
|
</div>
|
||
|
|
||
|
|
||
|
|
||
|
</section>
|
||
|
|
||
|
## Solution
|
||
|
<section id='solution'>
|
||
|
|
||
|
```js
|
||
|
// solution required
|
||
|
```
|
||
|
</section>
|