Created
June 21, 2023 22:24
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linked list
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// linked list | |
// print() (traversal) is O(n) time complexity where n scales with list size | |
// remaining methods are O(1) constant time | |
class Node { | |
constructor(data) { | |
this.data = data; | |
this.next = null; | |
} | |
} | |
class LinkedList { | |
constructor() { | |
this.head = null; | |
this.tail = null; | |
} | |
isEmpty() { | |
return this.head === null; | |
} | |
addToHead(data) { | |
const newNode = new Node(data); | |
if (this.isEmpty()) { | |
this.head = newNode; | |
this.tail = newNode; | |
} else { | |
newNode.next = this.head; | |
this.head = newNode; | |
} | |
} | |
addToTail(data) { | |
const newNode = new Node(data); | |
if (this.isEmpty()) { | |
this.head = newNode; | |
this.tail = newNode; | |
} else { | |
this.tail.next = newNode; | |
this.tail = newNode; | |
} | |
} | |
removeFromHead() { | |
if (this.isEmpty()) { | |
return null; | |
} | |
const removedData = this.head.data; | |
this.head = this.head.next; | |
if (this.head === null) { | |
this.tail = null; | |
} | |
return removedData; | |
} | |
print() { | |
let currentNode = this.head; | |
const elements = []; | |
while (currentNode !== null) { | |
elements.push(currentNode.data); | |
currentNode = currentNode.next; | |
} | |
console.log(elements.join(" -> ")); | |
} | |
} | |
// test output: | |
const linkedList = new LinkedList(); | |
linkedList.addToTail(15); | |
linkedList.addToTail(22); | |
linkedList.addToTail(31); | |
linkedList.print(); // Output: 15 -> 22 -> 31 | |
linkedList.removeFromHead(); | |
linkedList.print(); // Output: 22 -> 31 |
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