Get middle node of linked list

listMidNode.js

function getListMiddle(head){
   let slow = head;
   let fast = head;
    let moveBoth = false;
    
    // to get second element, in case of two mid-nodes, use 'fast' instead of 'fast.next'
    while(fast.next){
        if(moveBoth){
            slow = slow.next;
            fast = fast.next;
        }
        else{
            fast = fast.next;
        }
        moveBoth = !moveBoth;
    }
    
    return slow;
}