nodejs and reactjs

Author: sauravhathi

Subjects/INT222 - ADVANCED WEB DEVELOPMENT/10March.js

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+// const fs=require('fs')
+// const http=require('http')
+// const server=http.createServer()
+// server.on('request',(req,res)=>{
+// const rstream=fs.createReadStream("test1.txt")
+// rstream.on('data',(chunkdata)=>{
+// res.write(chunkdata)
+// })
+// rstream.on('end',()=>{
+// res.end()
+// })
+// rstream.on('error',(err)=>{
+// console.log(err)
+// res.end("file not found")
+// })
+// })
+// server.listen(8000,"127.0.0.1")
+
+
+const zlib = require('zlib')
+const fs = require('fs')
+const gzip = zlib.createGzip()
+const inp = fs.createReadStream('input.txt')
+const out = fs.createWriteStream('input.txt.gz')
+inp.pipe(gzip).pipe(out)

Subjects/INT222 - ADVANCED WEB DEVELOPMENT/1March.js

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+// // Synchronous 
+// const fs = require('fs')
+// fs.writeFileSync('text.txt','this is os module') // this creates a text file 
+// // node filename.js -> then it will create a file with content
+
+// try{
+// fs.rmSync('new.txt');
+// fs.copyFileSync('text.txt','text2.txt')
+// // using try catch 
+// console.log('Data copied')
+// }
+// catch(err){
+//   console.error('one of the file is missing')
+// }
+// // console of node and console of browser are different in nature
+
+// fs.renameSync('text.txt','text1.txt') // rename the file name
+// // deleting the file : - 
+// fs.rm('text2.txt')
+
+// // Asynchronous 
+// const fs = require('fs')
+// fs.writeFile("text.txt","This is Asych Mod",()=>{
+//   console.log("done")
+// });
+// fs.readFile("text.txt","utf-8",(err,data)=>{
+//   console.log(data)
+// }); // read file contents
+
+// fs.appendFile("text.txt","new Content Added",()=>{
+//   console.log("done")
+// });
+// //copyfile
+// fs.copyFile("text.txt","text12.txt",function(err){
+//   if(err)return console.log('file is missing')
+//   console.log("data copied")
+// });
+// // delete file
+// fs.unlink("text12.txt",function(err){
+//   if(err)return console.log('file is missing')
+//   console.log("deleted")
+// });
+
+//-------------------------------------------------------//
+
+// OS MODULES METHODS : - 
+// const os = require('os')
+// console.log(os.arch()) //architecture
+// console.log(os.freemem()) // free memory
+// console.log(os.hostname())
+// console.log(os.tmpdir())
+// console.log(os.type())
+// console.log(os.platform())
+
+//path module
+// const path= require('path')
+// console.log(path.parse("/Users/turwash/Desktop/Backend Class/1March.js"))
+// const mypath=path.parse("/Users/turwash/Desktop/Backend Class/1March.js")
+// console.log(mypath.name)
+
+// we can create our own modules as well 
+// const add = (a,b)=>{
+//     return a + b ;
+// }
+
+// const sub = (a,b)=>{
+//     return a - b ;
+// }
+
+// const mul = (a,b)=>{
+//     return a * b ;
+// }
+// const name = 'Turwash'
+
+// // module.exports.add= add;
+// // module.exports.sub= sub;
+// // module.exports.mul= mul;
+
+// // OBJECT DESTRUCURE
+// module.exports={add,sub,mul}
+
+
+
+
+// path.delimeter property
+const path1 = require('path1')
+console.log(process.env.path1)
+console.log(process.env.path1.split(path1.delimiter))
+
+

Subjects/INT222 - ADVANCED WEB DEVELOPMENT/Buffers.pptx

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+// Errror handling using try , catch -> all the paramteresd 3 ,
+// Finally, throw and block 
+
+
+// two properties of error object 
+
+
+
+
+
+// using throw : - 
+
+function divideByZero(num) {
+    try {
+      if (num === 0) {
+        throw "Cannot divide by zero";
+      } else {
+        return 10 / num;
+      }
+    } catch (error) {
+      console.log("Error: " + error);
+    }
+  }
+  
+  console.log(divideByZero(5)); 
+  console.log(divideByZero(0)); 
+  
+
+  

Subjects/INT222 - ADVANCED WEB DEVELOPMENT/CA.docx

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+Express notes : 
+// Normal sending of message: - 
+
+1) npm init -y (we initialized our express , this will create Package.json).
+2) Then we create index.js where we will write our codes.
+3) To install express we used -> npm install express --save (This installs Express and also created node_modules, package-lock.json). 
+4) We can also add node_modules : npm i or npm install 
+5) Uninstall express : npm uninstall express
+
+// Sending html file : - 
+6) Now we are creating Html file and adding it 
+7) To install Nodemon in our system we use -> npm install -g nodemon
+
+// Sending JSON File :- 
+8) 
+

Subjects/INT222 - ADVANCED WEB DEVELOPMENT/ErrorHandling.js

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+<!doctype html>
+<html lang="en">
+  <head>
+    <meta charset="utf-8">
+    <meta name="viewport" content="width=device-width, initial-scale=1">
+    <title>Bootstrap demo</title>
+    <link href="https://cdn.jsdelivr.net/npm/[email protected]/dist/css/bootstrap.min.css" rel="stylesheet" integrity="sha384-KK94CHFLLe+nY2dmCWGMq91rCGa5gtU4mk92HdvYe+M/SXH301p5ILy+dN9+nJOZ" crossorigin="anonymous">
+  </head>
+  <body>
+    <nav class="navbar navbar-expand-lg bg-body-tertiary">
+        <div class="container-fluid">
+          <a class="navbar-brand" href="#">Navbar</a>
+          <button class="navbar-toggler" type="button" data-bs-toggle="collapse" data-bs-target="#navbarSupportedContent" aria-controls="navbarSupportedContent" aria-expanded="false" aria-label="Toggle navigation">
+            <span class="navbar-toggler-icon"></span>
+          </button>
+          <div class="collapse navbar-collapse" id="navbarSupportedContent">
+            <ul class="navbar-nav me-auto mb-2 mb-lg-0">
+              <li class="nav-item">
+                <a class="nav-link active" aria-current="page" href="#">Home</a>
+              </li>
+              <li class="nav-item">
+                <a class="nav-link" href="#">Link</a>
+              </li>
+              <li class="nav-item dropdown">
+                <a class="nav-link dropdown-toggle" href="#" role="button" data-bs-toggle="dropdown" aria-expanded="false">
+                  Dropdown
+                </a>
+                <ul class="dropdown-menu">
+                  <li><a class="dropdown-item" href="#">Action</a></li>
+                  <li><a class="dropdown-item" href="#">Another action</a></li>
+                  <li><hr class="dropdown-divider"></li>
+                  <li><a class="dropdown-item" href="#">Something else here</a></li>
+                </ul>
+              </li>
+              <li class="nav-item">
+                <a class="nav-link disabled">Disabled</a>
+              </li>
+            </ul>
+            <form class="d-flex" role="search">
+              <input class="form-control me-2" type="search" placeholder="Search" aria-label="Search">
+              <button class="btn btn-outline-success" type="submit">Search</button>
+            </form>
+          </div>
+        </div>
+      </nav>
+
+    <script src="https://cdn.jsdelivr.net/npm/[email protected]/dist/js/bootstrap.bundle.min.js" integrity="sha384-ENjdO4Dr2bkBIFxQpeoTz1HIcje39Wm4jDKdf19U8gI4ddQ3GYNS7NTKfAdVQSZe" crossorigin="anonymous"></script>
+  </body>
+</html>

Subjects/INT222 - ADVANCED WEB DEVELOPMENT/Express.pptx

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+// Creating own server using Express
+
+const express = require('express');
+const path = require('path');
+const app = express();
+const port = 3000;
+
+app.get('/',(req,res)=>{
+    res.send("Congratulations Turwash, You have Sucessfully Created The Server !! ");
+})
+
+app.get('/about',(req,res)=>{
+    // res.send("Welcome to your About Page !! ");
+    // res.sendFile(path.join(__dirname, 'index.html'));
+    // res.status(500) // error status send 
+
+    // for json 
+    res.json({"Turwash" : 27});
+})
+
+app.get('/contact',(req,res)=>{
+    res.send("Contact Me @9693182173!! ");
+})
+
+app.listen(port,()=>{
+    console.log(`Listening to the port at ->  http://localhost:${port}`);
+})
+

Subjects/INT222 - ADVANCED WEB DEVELOPMENT/ExpressCode/Notes.txt

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+// const details = {
+//     name : "Turwash",
+//     college : "Lpu"
+// }
+
+// // console.log(details)
+
+// const deatils1 = JSON.stringify(details)
+// console.log(deatils1)
+
+// const deatils2 = JSON.parse(deatils1)
+// console.log(deatils2)
+
+
+// ---------------
+
+const fs = require('fs')
+const details = {
+    name : "Turwash",
+    college : "Lpu"
+}
+const jsondata = JSON.stringify(details)
+fs.writeFile("json1.js",jsondata,(err)=>{
+    console.log("Done")
+})
+
+fs.readFile("json1.js","utf-8",(err,data)=>{
+    const jsonparsed = JSON.parse(data);
+    console.log(data)
+    console.log(jsonparsed)
+})
+