code: function dijkstraAll(g, weightFunc, incidentFunc) {
    var results = {};
    g.nodes().forEach(function(u) {
      results[u] = dijkstra(g, u, weightFunc, incidentFunc);
    });
    return results;
  }
docs: This function finds the shortest path from each node to every other
  reachable node in the graph. It is similar to [alg.dijkstra][], but
  instead of returning a single-source array, it returns a mapping of
  of `source -> alg.dijksta(g, source, weightFunc, incidentFunc)`.
  
  This function takes an optional `weightFunc(e)` which returns the
  weight of the edge `e`. If no weightFunc is supplied then each edge is
  assumed to have a weight of 1. This function throws an Error if any of
  the traversed edges have a negative edge weight.
  
  This function takes an optional `incidentFunc(u)` which returns the ids of
  all edges incident to the node `u` for the purposes of shortest path
  traversal. By default this function uses the `outEdges` function on the
  supplied graph.
  
  This function takes `O(|V| * (|E| + |V|) * log |V|)` time.
  
  [alg.dijkstra]: dijkstra.js.html#dijkstra
  
  @param {Graph} g the graph to search for shortest paths from **source**
  @param {Function} [weightFunc] optional weight function
  @param {Function} [incidentFunc] optional incident function