function djikstraAlgorithm(startNode) {
   let distances = {};

   // Stores the reference to previous nodes
   let prev = {};
   let pq = new PriorityQueue(this.nodes.length * this.nodes.length);

   // Set distances to all nodes to be infinite except startNode
   distances[startNode] = 0;
   pq.enqueue(startNode, 0);
   this.nodes.forEach(node => {
      if (node !== startNode) distances[node] = Infinity;
      prev[node] = null;
   });

   while (!pq.isEmpty()) {
      let minNode = pq.dequeue();
      let currNode = minNode.data;
      let weight = minNode.priority;
      this.edges[currNode].forEach(neighbor => {
         let alt = distances[currNode] + neighbor.weight;
         if (alt < distances[neighbor.node]) {
            distances[neighbor.node] = alt;
            prev[neighbor.node] = currNode;
            pq.enqueue(neighbor.node, distances[neighbor.node]);
         }
      });
   }
   return distances;
}

class Graph {
   constructor() {
      this.edges = {};
      this.nodes = [];
   }
   addNode(node) {
      this.nodes.push(node);
      this.edges[node] = [];
   }
   addEdge(node1, node2) {
      this.edges[node1].push(node2);
      this.edges[node2].push(node1);
   }
   addDirectedEdge(node1, node2) {
      this.edges[node1].push(node2);
   }
   display() {
      let graph = ""; this.nodes.forEach(node => {
         graph += node + "->" + this.edges[node].join(", ") + "\n";
      });
      console.log(graph);
   }
}

let g = new Graph();
g.addNode("A");
g.addNode("B");
g.addNode("C");
g.addNode("D");
g.addNode("E");
g.addNode("F");
g.addNode("G");

g.addDirectedEdge("A", "C", 100);
g.addDirectedEdge("A", "B", 3);
g.addDirectedEdge("A", "D", 4);
g.addDirectedEdge("D", "C", 3);
g.addDirectedEdge("D", "E", 8);
g.addDirectedEdge("E", "F", 10);
g.addDirectedEdge("B", "G", 9);
g.addDirectedEdge("E", "G", 50);

var test = g.djikstraAlgorithm("A");
console.log(test);