Hands-On Data Structures and Algorithms with JavaScript

Creating a web server

Before we write any code for our Personalized PageRank, let's first create a Node.js application, as explained earlier. 

Once the application is ready, let's create a route that will be serving us our user suggestions. Similar to the example from the preceding example, we can quickly piece together the following route under routes/suggestions.js:

const express = require('express');const router = express.Router();const _ = require('lodash');// sample set of users with friends extracted from some grapgh dbconst users = {   A: { neighbors: [ 'B', 'D' ] },   B: { neighbors: [ 'A', 'C', 'E' ] },   C: { neighbors: [ 'B', 'D', 'E' ] },   D: { neighbors: [ 'A', 'C' ] },   E: { neighbors: [ 'B', 'C' ] }};// middleware router.use(function ...