var insert = function(value, parent) {

  var node = { val: value };

​

  if (parent) {

    // Connect a node to the parent.

    parent.next = node;

  }

  return node;

}

​

var remove = function(head, position) {

  if (head == null) {

    return null;

  }

  else if (position === 0) {

    return head.next;

  }

  else {

    var n = head;

    for (var i = 0; i < position - 1; i++) {

      n = n.next;

    }

    n.next = n.next.next;

​

    return head;

 }

}

​

var traverse = function(root, callback) {

  while (root) {

    if (callback) {

      callback(root);

    }

    root = root.next;

  }

}

​

var root = insert(1);

var child = insert(2, root);

child = insert(3, child);

child = insert(4, child);

child = insert(5, child);