code: function saveBest(g) {
    var graph = g.graph();
    var cc = crossCount(g);
    if (!('orderCC' in graph) || graph.orderCC > cc) {
      graph.orderCC = cc;
      graph.order = {};
      g.eachNode(function(u, value) {
        if ('order' in value) {
          graph.order[u] = value.order;
        }
      });
      return true;
    }
    return false;
  }
docs: /*
  Checks if the current ordering of the graph has a lower cross count than the
  current best. If so, saves the ordering of the current nodes and the new
  best cross count. This can be used with restoreBest to restore the last best
  ordering.
  
  If this is the first time running the function the current ordering will be
  assumed as the best.
  
  Returns `true` if this layout represents a new best.