Graph

class Graph{
    constructor()
    {
        this.nodes = 0;
        this.list = [];
    }
    addVertex(v)
    {
       this.list[v] = []; 
       this.nodes++;
    }
    addEdge(v,e)
    {
        this.list[v].push(e);
        this.list[e].push(v);
    }
    showConnections(){
       for(let i=0;i<this.list.length;i++)
       console.log(i+'->'+this.list[i])
    }
}
const myGraph = new Graph();
myGraph.addVertex('0');
myGraph.addVertex('1');
myGraph.addVertex('2');
myGraph.addVertex('3');
myGraph.addVertex('4');
myGraph.addVertex('5');
myGraph.addVertex('6');
myGraph.addEdge('3', '1'); 
myGraph.addEdge('3', '4'); 
myGraph.addEdge('4', '2'); 
myGraph.addEdge('4', '5'); 
myGraph.addEdge('1', '2'); 
myGraph.addEdge('1', '0'); 
myGraph.addEdge('0', '2'); 
myGraph.addEdge('6', '5');

myGraph.showConnections();