Change the node server code by adding some instructions: const express = require('express'); const dotenv = require('dotenv'); dotenv.config(); const app = express(); app.get('/dotted', (req, res) => { const { word1, word2 } = req.query; const dots = '.'.repeat(30 - word1.length - word2.length); const result = `${word1}${dots}${word2}`; res.status(200).contentType('text/html').send(result); }); app.get("/fizzBuzz", (req, res) => { const start = parseInt(req.query.start); const end = parseInt(req.query.end); let response = ""; for (let i = start; i <= end; i++) { if (i % 3 === 0 && i % 5 === 0) { response += "FizzBuzz\n"; } else if (i % 3 === 0) { response += "Fizz\n"; } else if (i % 5 === 0) { response += "Buzz\n"; } else { response += `${i}\n`; } } res.contentType("text/html"); res.send(`${response}`); }); app.get('/gradeStats', (req, res) => { const { grades } = req.query; const min = Math.min(...grades); const max = Math.max(...grades); const avg = (grades.reduce((a, b) => a + b) / grades.length).toFixed(2); const result = JSON.stringify({ average: avg, minimum: min, maximum: max }); res.status(200).contentType('application/json').send(result); }); app.get("/rectangle", (req, res) => { const length = parseInt(req.query.length); const width = parseInt(req.query.width); const area = length * width; const perimeter = 2 * (length + width); const response = { area, perimeter }; res.contentType("application/json"); res.send(response); }); const PORT = process.env.PORT || 3000; const HOST = process.env.HOST || 'localhost'; app.listen(PORT, HOST, () => { console.log(`Server running at http://${HOST}:${PORT}`); }); Use Express Session Use the session to keep track of: How many commands have been executed. What the last command executed was. Create a middleware function to keep track of this information. Add a JSON endpoint: /stats It will return responses like: {"commandCount": 3, "lastCommand": "/dotted"} Calling /stats will not increment commandCount or change the lastCommand value.

Change the node server code by adding some instructions: const express = require('express'); const dotenv = require('dotenv'); dotenv.config(); const app = express(); app.get('/dotted', (req, res) => { const { word1, word2 } = req.query; const dots = '.'.repeat(30 - word1.length - word2.length); const result = `${word1}${dots}${word2}`; res.status(200).contentType('text/html').send(result); }); app.get("/fizzBuzz", (req, res) => { const start = parseInt(req.query.start); const end = parseInt(req.query.end); let response = ""; for (let i = start; i <= end; i++) { if (i % 3 === 0 && i % 5 === 0) { response += "FizzBuzz\n"; } else if (i % 3 === 0) { response += "Fizz\n"; } else if (i % 5 === 0) { response += "Buzz\n"; } else { response += `${i}\n`; } } res.contentType("text/html"); res.send(`${response}`); }); app.get('/gradeStats', (req, res) => { const { grades } = req.query; const min = Math.min(...grades); const max = Math.max(...grades); const avg = (grades.reduce((a, b) => a + b) / grades.length).toFixed(2); const result = JSON.stringify({ average: avg, minimum: min, maximum: max }); res.status(200).contentType('application/json').send(result); }); app.get("/rectangle", (req, res) => { const length = parseInt(req.query.length); const width = parseInt(req.query.width); const area = length * width; const perimeter = 2 * (length + width); const response = { area, perimeter }; res.contentType("application/json"); res.send(response); }); const PORT = process.env.PORT || 3000; const HOST = process.env.HOST || 'localhost'; app.listen(PORT, HOST, () => { console.log(`Server running at http://${HOST}:${PORT}`); }); Use Express Session Use the session to keep track of: How many commands have been executed. What the last command executed was. Create a middleware function to keep track of this information. Add a JSON endpoint: /stats It will return responses like: {"commandCount": 3, "lastCommand": "/dotted"} Calling /stats will not increment commandCount or change the lastCommand value.

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Use Express Session

Use the session to keep track of:

How many commands have been executed.
What the last command executed was.

Create a middleware function to keep track of this information.
Add a JSON endpoint: /stats

It will return responses like: {"commandCount": 3, "lastCommand": "/dotted"}
Calling /stats will not increment commandCount or change the lastCommand value.

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