Odd Even Linked List | LeetCode 328

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/**
 * @param {ListNode} head
 * @return {ListNode}
 */
var oddEvenList = function(head) {
    if (head === null) {
        return null;
    }
    
    let odd = head;
    let even = head.next;
    let evenHead = even;
    
    while (even !== null && even.next !== null) {
        odd.next = even.next
        odd = odd.next;
        even.next = odd.next;
        even = even.next
    }
    
    odd.next = evenHead;
    return head;
};