Finally, we need to be able to add and remove edges (or connections) between the various nodes. Assuming this is a undirected graph, we can simply add the two nodes to each others' adjacency lists to create an edge:

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addEdge(src, dest) {

  this.adjacencyList.get(src).push(dest);

  this.adjacencyList.get(dest).push(src);

  // push to both adjacency lists   

}