LinkedList - my version
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class Node {
constructor(value) {
this.value = value;
this.next = null
}
}
class LinkedList {
constructor(value) {
this.head = {
value: value,
next: null
},
this.tail = this.head;
this.length = 1;
}
append(value) {
const newNode = new Node(value);
this.tail.next = newNode;
this.tail = newNode;
this.length++;
// console.log(this);
return this;
}
prepend(value) {
const newNode = new Node(value);
newNode.next = this.head;
this.head = newNode;
this.length++;
// console.log(this);
return this;
}
traverse(index) {
if (index === 0) return this.head;
if (index === 1) return this.head.next;
let currentLength = 0;
let currentNode = this.head;
while (currentNode !== null || currentLength <= index) {
if (currentLength === index) return currentNode;
currentLength++;
currentNode = currentNode.next;
}
}
lookup(value) {
if (this.head.value === value)
return this.head;
let currentValue = this.head;
while (currentValue !== null) {
if (currentValue.value === value) return currentValue;
currentValue = currentValue.next;
}
return foundValue;
}
insert(index, value) {
if (index >= this.length) return this.append(value);
const newNode = new Node(value);
const prevNode = this.traverse(index-1);
const node = prevNode.next;
if (!node) return this;
prevNode.next = newNode;
newNode.next = node;
this.length++;
// console.log(this);
return this;
}
remove(index) {
const prevNode = this.traverse(index-1);
const nodeToDelete = prevNode.next;
prevNode.next = nodeToDelete.next;
this.length--;
// console.log(this);
return this;
}
pop() {
this.tail = null;
this.length--;
return this;
}
printList() {
const list = [];
let currentNode = this.head;
while (currentNode !== null) {
list.push(currentNode.value);
currentNode = currentNode.next;
}
console.log(list);
}
}
const linkedList = new LinkedList(10);
console.log(linkedList);
linkedList.append(5);
linkedList.append(15);
linkedList.append(48);
linkedList.append(66);
linkedList.append(100);
linkedList.printList();
linkedList.prepend(98);
linkedList.printList();
linkedList.insert(3, 200);
linkedList.printList();
linkedList.remove(2);
linkedList.printList();
console.log(linkedList.lookup(48));
JavaScript
INFO