[рони]

Dilettante_Pro,
это?

let list = {
    value: 1,
    next: {
      value: 2,
      next: {
        value: 3,
        next: {
          value: 4,
          next: null
        }
      }
    }
  };

  function printList(list) {
  var a = list.value;
    if (list.next) {
      printList(list.next);
    }
   alert(a);
   return a
  }
  var a =  printList(list);