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linked_list.js
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linked_list.js
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class Node {
constructor(value, next){
this.value = value ?? null,
this.next = next ?? null
}
}
class LinkedList {
constructor(){
this.head = null;
this.tail = null;
this.length = 0;
}
_firstInsert(value) {
this.head = new Node(value);
this.tail = this.head;
this.length++;
return value;
}
append(value) {
if (!this.head) return this._firstInsert(value);
let newNode = new Node(value);
this.tail.next = newNode;
this.tail = newNode;
this.length++;
return value;
}
prepend(value) {
let newNode = new Node(value, this.head);
this.head = newNode;
this.length++;
return value;
}
show() {
if (this.length === 0) { console.log("[] ", this.length); return }
let list = [];
let currentNode = this.head;
while(currentNode.next) {
list.push(currentNode.value);
currentNode = currentNode.next;
}
list.push(this.tail.value);
console.log(list, this.length);
}
insert(index, value) {
if (typeof index !== 'number' || index <= 0 || index > this.length) throw "Error: index must be a positive number less than length"
if ( index === 0 ) {
this.head = new Node(value, this.head);
this.length++;
return
}
let node = this.traverseToIndex(index - 1);
let newNode = new Node(value, node.next);
node.next = newNode;
this.length++;
}
remove(index) {
if (typeof index !== 'number' || index < 0 || index > this.length) throw "Error: index must be a positive number less than length"
if (index === 0) {
this.head = this.head.next
this.length--;
return
}
let previousNode = this.traverseToIndex(index - 1);
let nextNode = previousNode.next.next;
delete previousNode.next;
previousNode.next = nextNode;
this.length--;
}
traverseToIndex(index) {
if (typeof index !== 'number' || index < 0 || index > this.length) throw "Error: index must be a positive number less than length"
let i = 0;
let currentNode = this.head;
while(i < index) {
currentNode = currentNode.next;
i++;
}
return currentNode;
}
}
let list = new LinkedList();
list.append("0")
list.append("1")
list.append("2")
list.append("3")
list.append("4")
list.append("5")
list.show()
list.prepend("-1")
list.append("*8")
list.show()
list.insert(2,"9")
list.show()
list.remove(2)
list.show()
console.log(list);
console.log("head: ",list.head);
console.log("tail: ",list.tail);