https://leetcode.com/problems/remove-zero-sum-consecutive-nodes-from-linked-list/

RemoveZeroSumConsecutiveNodesfromLinkedList.js

/**
 * Definition for singly-linked list.
 * function ListNode(val) {
 *     this.val = val;
 *     this.next = null;
 * }
 */
var removeZeroSumSublists = function(head) {

    const array = [];
    let curr = head;
    while(curr){
        array.push(curr.val);
        curr = curr.next;
    }

    const result = [];
    let [total, seenAt] = [0, new Map()];

    for(let i=0; i<array.length; i++){
        total+=array[i];
        result.push(array[i]);

        if(total === 0) [seenAt, result] = [new Map(), []];

        else if(seenAt.has(total)){            
            const [endIndex, totalAfterCleaning] = [seenAt.get(total), total];
            while(result.length -1 > endIndex){
                const removed = result.pop();
                total-=removed;
                seenAt.delete(total);
            }
            seenAt.set(totalAfterCleaning, endIndex);
        }else{
            seenAt.set(total, result.length-1);
        }
    }

    if(!result.length) return null;

    const rtn = new ListNode(result[0]);
    let tail = rtn;
    for(let i=1; i<result.length; i++){
        tail.next = new ListNode(result[i]);
        tail = tail.next;
    }
    return rtn;
};