Week7

01-node-tutorial/answers/.gitignore

@@ -0,0 +1,5 @@
+/node_modules
+
+.DS_Store  
+
+temp.txt

01-node-tutorial/answers/01-intro.js

@@ -0,0 +1,8 @@
+const amount = 9
+
+if (amount < 10) {
+    console.log('small number')
+} else {
+    console.log('large number')
+}
+

01-node-tutorial/answers/02-global.js

@@ -0,0 +1,2 @@
+console.log(__dirname);
+console.log(process.env.MY_VAR);

01-node-tutorial/answers/03-modules.js

@@ -0,0 +1,7 @@
+const names = require("./04-names.js");
+const fullname = require("./05-utils.js")
+const alt = require("./06-alternative-flavor.js")
+const activate = require("./07-mind-grenade.js")
+
+fullname(names.carl, names.carl_lastname)
+console.log(`Hello my name is ${alt.singlePerson.name} my favorite foods are ${alt.favoriteFood[0]} and ${alt.favoriteFood[1]}!`)

01-node-tutorial/answers/04-names.js

@@ -0,0 +1,6 @@
+const carl = 'Carl'
+const carl_lastname = 'Balansag'
+const random_name = 'Jake'
+const random_name_lastname = 'Smith'
+
+module.exports = { carl, carl_lastname, random_name, random_name_lastname }

01-node-tutorial/answers/05-utils.js

@@ -0,0 +1,5 @@
+const fullname = (first, last) => {
+    console.log(`Hello my full name is ${first} ${last}`)
+}
+
+module.exports = fullname

01-node-tutorial/answers/06-alternative-flavor.js

@@ -0,0 +1,6 @@
+module.exports.favoriteFood = ['Steak', 'Cheese']
+const person = {
+    name: 'Jack',
+}
+
+module.exports.singlePerson = person

01-node-tutorial/answers/07-mind-grenade.js

@@ -0,0 +1,5 @@
+function activate(name, food1, food2) {
+    console.log(`This was activated from another file`)
+}
+
+activate()

01-node-tutorial/answers/08-os-module.js

@@ -0,0 +1,3 @@
+const os = require("os");
+
+console.log(os)

01-node-tutorial/answers/09-path-module.js

@@ -0,0 +1,4 @@
+const path = require('path')
+
+const filePath = path.join('folder1', 'folder2', 'folder3', 'file.txt')
+console.log(filePath)

01-node-tutorial/answers/10-fs-sync.js

@@ -0,0 +1,15 @@
+const { writeFileSync, readFileSync } = require('fs')
+
+//Creates the file (or overwrites if it exists)
+writeFileSync('./temporary/fileA.txt', 'This is line 1\n')
+
+//Append flag adds to the file
+writeFileSync('./temporary/fileA.txt', 'This is line 2\n', { flag: 'a' })
+
+//Apend flag adds to the file
+writeFileSync('./temporary/fileA.txt', 'This is line 3\n', { flag: 'a' })
+
+//Read the file
+const content = readFileSync('./temporary/fileA.txt', 'utf8')
+
+console.log(content)

01-node-tutorial/answers/11-fs-async.js

@@ -0,0 +1,29 @@
+const { writeFile } = require("fs");
+console.log("at start");
+writeFile("./temporary/fileB.txt", "This is line 1\n", (err, result) => {
+    console.log("at point 1");
+    if (err) {
+        console.log("This error happened: ", err);
+    } else {
+        //Write line 2 inside this callback
+        writeFile("./temporary/fileB.txt", "This is line 2\n", { flag: "a" }, (err, result) => {
+        console.log("at point 2");
+        if (err) {
+            console.log("This error happened: ", err);
+        } else {
+            //Write line 3 inside this callback
+            writeFile("./temporary/fileB.txt", "This is line 3\n", { flag: "a" }, (err, result) => {
+            console.log("at point 3");
+            if (err) {
+                console.log("This error happened: ", err);
+            } else {
+                //Everything worked write completed
+                console.log("File writing complete!");
+            }
+            });
+        }
+        });
+    }
+});
+
+console.log("at end");

01-node-tutorial/answers/12-http.js

@@ -0,0 +1,18 @@
+const http = require('http')
+
+const server = http.createServer((req, res) => {
+    if (req.url === '/') {
+        res.end('This is the the home page')
+    } else if (req.url === '/about') {
+        res.end('This is the about page')
+    } else {
+        res.end(`
+        <h1>ERROR!</h1>
+        <p>PAGE YOU ARE LOOKING FOR DOESN'T EXIST</p>
+        <a href="/">back home</a>
+        `)
+    }
+})
+
+server.listen(3000)
+console.log('Server is listening on port 3000...')

01-node-tutorial/answers/16-streams.js

@@ -0,0 +1,21 @@
+const { createReadStream } = require('fs');
+
+const stream = createReadStream('../content/big.txt', {
+    encoding: 'utf8',
+    highWaterMark: 200
+});
+
+let counter = 0;
+
+stream.on('data', (result) => {
+    counter++;
+    console.log(`Chunk ${counter}:`, result);
+});
+
+stream.on('end', () => {
+    console.log(`\nStream ended. Total chunks received: ${counter}`);
+});
+
+stream.on('error', (error) => {
+    console.error('Error reading stream:', error);
+});

01-node-tutorial/answers/customEmitter.js

@@ -0,0 +1,22 @@
+const EventEmitter = require("events");
+
+// Create an emitter
+const emitter = new EventEmitter();
+
+// Set up event handlers
+emitter.on("greeting", (name) => {
+    console.log(`Hello, ${name}!`);
+});
+
+emitter.on("timer", (msg) => {
+    console.log(msg);
+});
+
+// Emit some events
+emitter.emit("greeting", "Tom");
+emitter.emit("greeting", "Bob");
+
+// Set up a timer that emits events every 2 seconds
+setInterval(() => {
+    emitter.emit("timer", "Timer event triggered");
+}, 2000);

01-node-tutorial/answers/prompter.js

@@ -20,19 +20,24 @@ const getBody = (req, callback) => {
   });
 };
 
-// here, you could declare one or more variables to store what comes back from the form.
-let item = "Enter something below.";
+//Generate a random secret number between 1 and 100
+let secretNumber = Math.floor(Math.random() * 100) + 1;
+let message = "Guess the number between 1 and 100.";
+let attempts = 0;
 
-// here, you can change the form below to modify the input fields and what is displayed.
-// This is just ordinary html with string interpolation.
 const form = () => {
   return `
   <body>
-  <p>${item}</p>
-  <form method="POST">
-  <input name="item"></input>
-  <button type="submit">Submit</button>
-  </form>
+    <h1>Number Guessing Game</h1>
+    <p>${message}</p>
+    <p>Attempts: ${attempts}</p>
+    <form method="POST">
+      <input name="guess" type="number" min="1" max="100" placeholder="Enter your guess"></input>
+      <button type="submit">Guess</button>
+    </form>
+    <form method="POST">
+      <button name="reset" value="true" type="submit">New Game</button>
+    </form>
   </body>
   `;
 };
@@ -43,13 +48,35 @@ const server = http.createServer((req, res) => {
   if (req.method === "POST") {
     getBody(req, (body) => {
       console.log("The body of the post is ", body);
-      // here, you can add your own logic
-      if (body["item"]) {
-        item = body["item"];
+
+      // Check if user wants to reset the game
+      if (body["reset"]) {
+        secretNumber = Math.floor(Math.random() * 100) + 1;
+        message = "New game started! Guess the number between 1 and 100.";
+        attempts = 0;
+        console.log(`New secret number generated: ${secretNumber}`);
+      }
+      // Process the guess
+      else if (body["guess"]) {
+        const guess = parseInt(body["guess"]);
+        attempts++;
+
+        console.log(`Player guessed: ${guess}, Secret number: ${secretNumber}, Attempts: ${attempts}`);
+
+        if (isNaN(guess)) {
+          message = "Please enter a valid number!";
+        } else if (guess === secretNumber) {
+          message = `Congratulations! You guessed it in ${attempts} attempts! The number was ${secretNumber}.`;
+          console.log(`Player won in ${attempts} attempts!`);
+        } else if (guess < secretNumber) {
+          message = `Too low! Try again. (Attempt ${attempts})`;
+        } else {
+          message = `Too high! Try again. (Attempt ${attempts})`;
+        }
       } else {
-        item = "Nothing was entered.";
+        message = "Please enter a guess!";
       }
-      // Your code changes would end here
+
       res.writeHead(303, {
         Location: "/",
       });
@@ -60,5 +87,8 @@ const server = http.createServer((req, res) => {
   }
 });
 
+server.on("request", (req) => {  
+  console.log("event received: ", req.method, req.url);  
+});  
 server.listen(3000);
-console.log("The server is listening on port 3000.");
+console.log("The server is listening on port 3000.");

01-node-tutorial/answers/writeWithPromisesThen.js

@@ -0,0 +1,18 @@
+const { writeFile, readFile } = require("fs").promises;
+
+writeFile('./temporary/temp.txt', 'This is line 1\n')
+    .then(() => {
+        return writeFile('./temporary/temp.txt', 'This is line 2\n', { flag: 'a' });
+    })
+    .then(() => {
+        return writeFile('./temporary/temp.txt', 'This is line 3\n', { flag: 'a' });
+    })
+    .then(() => {
+        return readFile('./temporary/temp.txt', 'utf8');
+    })
+    .then((data) => {
+        console.log(data);
+    })
+    .catch((error) => {
+        console.log("An error occurred: ", error);
+    });

01-node-tutorial/answers/writeWithpromisesAwait.js

@@ -0,0 +1,28 @@
+const { writeFile, readFile } = require("fs").promises;
+
+async function writer() {
+    try {
+        await writeFile('./temporary/temp.txt', 'This is line 1\n');
+        await writeFile('./temporary/temp.txt', 'This is line 2\n', { flag: 'a' });
+        await writeFile('./temporary/temp.txt', 'This is line 3\n', { flag: 'a' });
+        console.log('File written successfully');
+    } catch (error) {
+        console.error('Error writing file:', error);
+    }
+}
+
+async function reader() {
+    try {
+        const content = await readFile('./temporary/temp.txt', 'utf8');
+        console.log(content);
+    } catch (error) {
+        console.error('Error reading file:', error);
+    }
+}
+
+async function readWrite() {
+    await writer();
+    await reader();
+}
+
+readWrite();

02-express-tutorial/app.js

@@ -1 +1,82 @@
 console.log('Express Tutorial')
+const express = require('express');
+const { products } = require("./data");
+const peopleRouter = require("./routes/people");
+const app = express();
+
+//Middleware
+
+const logger = (req, res, next) => {
+    const method = req.method
+    const url = req.url
+    const time = new Date().getFullYear()
+    console.log(method, url, time)
+    next()
+}
+
+app.use(logger); 
+app.use(express.static('./public'));
+app.use(express.urlencoded({ extended: false }));
+app.use(express.json());
+
+//ROUTES
+app.get('/api/v1/test', (req, res) => {
+    res.json({ message: "It worked!" });
+});
+
+app.get('/api/v1/products/:productID', (req, res) => {
+    const idToFind = parseInt(req.params.productID);
+    const product = products.find((p) => p.id === idToFind);
+
+    if (!product) { return res.status(404).json({ message: "That product was not found." });}
+
+    res.json(product);
+});
+
+app.get('/api/v1/query', (req, res) => {
+    const { search, limit, maxPrice } = req.query;
+    let result = [...products];
+
+    //filter by search when the name starts with ""
+    if (search) {
+        result = result.filter((input) =>
+            input.name.toLowerCase().startsWith(search.toLowerCase())
+        );
+    }
+
+    //filter by the max price
+    if (maxPrice) {
+        const maxPriceNum = parseFloat(maxPrice);
+        if (!isNaN(maxPriceNum)) {
+            result = result.filter((input) => input.price <= maxPriceNum);
+        }
+    }
+
+    //limit results
+    if (limit) {
+        const limitNum = parseInt(limit);
+        if (!isNaN(limitNum) && limitNum > 0) {
+            result = result.slice(0, limitNum);
+        }
+    }
+
+    res.json(result);
+});
+
+app.get('/api/v1/products', (req, res) => {
+    res.json(products);
+});
+
+app.use("/api/v1/people", peopleRouter);
+
+
+//Handle Errors
+app.all('*', (req, res) => {
+    res.status(404).send('Page not found');
+});
+
+
+const PORT = 3000;
+app.listen(PORT, () => {
+    console.log(`Server on port ${PORT}...`);
+});