Stack-Implementierung mit Javascript (verlinkte Liste)

class Node { constructor(value) { this.value = value; this.next = null; } } class LinkedList { constructor() { this.head = this.tail = null; this.size = 0; } append(value) { const newNode = new Node(value); if (this.head === null) { console.log('Inside strange') this.head = this.tail = newNode; this.size = 1; return; } this.tail.next = newNode; this.tail = newNode; this.size++; } deletAtEnd() { if (this.size <= 1) { this.head = this.tail = null; this.size = 0; return; } let currentNode = this.head; const pos = this.size -1; let counter = 1; while (currentNode) { if (counter++ === pos) { currentNode.next = null; this.tail = currentNode; this.size--; return ; } currentNode = currentNode.next; } } traversal() { let currentNode = this.head; while (currentNode) { console.log(currentNode.value); currentNode = currentNode.next; } } reverse() { let currentNode = this.head; let prevNode = null; let nextNode = null; while (currentNode) { nextNode = currentNode.next; currentNode.next = prevNode; if (prevNode === null) { this.tail = currentNode; } prevNode = currentNode; currentNode = nextNode; } this.head = prevNode; this.traversal(); } } class Stack { stack; constructor() { this.stack = new LinkedList(); } push(value) { this.stack.append(value); } pop() { this.stack.deletAtEnd() } peak() { console.log('Peak Value ---> ', this.stack.tail.value); } traversal() { this.stack.reverse(); } } const test = new Stack(); test.push(20); test.push(13); test.push(3); test.push(5); test.push(9); console.log(test.stack) console.log('---------------Peak-------------') test.peak() console.log('-------------After Pop ------------'); test.pop(); test.peak() test.traversal() /* LinkedList { tail: Node { value: 9, next: null }, head: Node { value: 20, next: Node { value: 13, next: [Node] } }, size: 5 } ---------------Peak------------- Peak Value ---> 9 -------------After Pop ------------ Peak Value ---> 5 5 3 13 20 */