链表

创建链表

  function ListNode(val, next) {
      this.val = (val===undefined ? 0 : val)
      this.next = (next===undefined ? null : next)
  }
  
  function arrayToLinkedList(arr) {
    if (arr.length === 0) return null;

    let head = new ListNode(arr[0]);
    let current = head;

    for (let i = 1; i < arr.length; i++) {
        current.next = new ListNode(arr[i]);
        current = current.next;
    }

    return head;
}

// 测试
const arr = [1, 2, 3, 4, 5];
const linkedList = arrayToLinkedList(arr);
console.log(JSON.stringify(linkedList, null, 2));
// ***************************
1 -> 2 -> 3 -> 4 -> 5 -> null

{
  "val": 1,
  "next": {
    "val": 2,
    "next": {
      "val": 3,
      "next": {
        "val": 4,
        "next": {
          "val": 5,
          "next": null
        }
      }
    }
  }
}

遍历链表

function traverseLinkedList(head) {
    let current = head;
    while (current !== null) {
        console.log(current.val);
        current = current.next;
    }
}

// 示例
let arr = [1, 2, 3, 4, 5];
let linkedList = arrayToLinkedList(arr);
traverseLinkedList(linkedList);