removed host variable and prettified syntax

app.js

@@ -1,28 +1,27 @@
-const express = require("express");
+const express = require('express');
 const app = express();
 const router = express.Router();
 
 const path = __dirname + '/views/';
 
-const PORT = 8080;
-const HOST = '0.0.0.0';
+const port = 8080;
 
 router.use(function (req,res,next) {
-  console.log("/" + req.method);
+  console.log('/' + req.method);
   next();
 });
 
-router.get("/",function(req,res){
-  res.sendFile(path + "index.html");
+router.get('/',function(req,res){
+  res.sendFile(path + 'index.html');
 });
 
-router.get("/sharks",function(req,res){
-  res.sendFile(path + "sharks.html");
+router.get('/sharks',function(req,res){
+  res.sendFile(path + 'sharks.html');
 });
 
 app.use(express.static(path));
-app.use("/", router);
+app.use('/', router);
 
-app.listen(8080, function () {
+app.listen(port, function () {
   console.log('Example app listening on port 8080!')
 })