├── first node.js
├── rohan.txt
├── osmodule.js
├── second.js
├── fs module.js
├── path module.js
├── package.json
├── blocking or non-blocking.js
├── serving html by backend.js
├── tut63.js
└── tut61.html


/first node.js:
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1 | const harry = require("./second");
2 | 
3 | console.log("hello world", harry)
4 | 


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/rohan.txt:
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1 | Hello I am Adam Warlock or Starlord or warlord
2 | and I am the student of Ra's Ghul 


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/osmodule.js:
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1 | const os = require('os');
2 | 
3 | console.log(os.freemem())
4 | console.log(os.homedir())
5 | console.log(os.hostname())
6 | console.log(os.platform())
7 | console.log(os.type())


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/second.js:
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 1 | // (function(exports,require,nodule,_filename,_dirname){
 2 | 
 3 | harry = {
 4 |     name:"harry",
 5 |     favNum:3,
 6 |     developer: true
 7 | }
 8 | console.log(exports,require,nodule,_filename,_dirname)
 9 | module.export = harry;
10 | // })


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/fs module.js:
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1 | const fs = require("fs");
2 | let text = fs.readFileSync("dele.txt", "utf-8");
3 | text = text.replace("brower","program")
4 | 
5 | console.log("The content is")
6 | console.log(text);
7 | 
8 | console.log("creating a new file")
9 | fs.writeFileSync("rohan.txt", text)


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/path module.js:
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 1 | const path = require('path');
 2 | 
 3 | 
 4 | const a = path.basename('C:\\temp\\myfile.html');
 5 | const a2 = path.dirname('C:\\temp\\myfile.html');
 6 | console.log(a)
 7 | console.log(a2)
 8 | 
 9 | const a3 = path.extname(__filename)
10 | console.log(__filename,a3)


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/package.json:
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 1 | {
 2 |   "name": "fardin",
 3 |   "version": "1.0.0",
 4 |   "description": "its an amazing package",
 5 |   "main": "first node.js",
 6 |   "scripts": {
 7 |     "test": "echo \"Error: no test specified\" && exit 1"
 8 |   },
 9 |   "author": "fardin",
10 |   "license": "ISC",
11 |   "dependencies": {},
12 |   "devDependencies": {}
13 | }
14 | 


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/blocking or non-blocking.js:
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 1 | // Synchronous or blocking
 2 | //line by line execution
 3 | 
 4 | /*Asymchronous or non-blocking
 5 | line by line exexution not guaranteed
 6 | callback will fire */
 7 | 
 8 | 
 9 | const fs = require("fs");
10 | fs.readFile("dele.txt", "utf-8", (err,data)=>{
11 |     console.log(err,data)
12 | });
13 | console.log("This is the message")


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/serving html by backend.js:
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 1 | const http = require('http')
 2 | const fs = require('fs')
 3 | const fileContent = fs.readFileSync('tut61.html')
 4 | 
 5 | const server = http.createServer((req, res)=>{
 6 |    
 7 |     res.writeHead(200, {'content-type':'text/html'})
 8 |     res.end(fileContent)
 9 | })
10 | server.listen(80, '127.0.0.1', ()=>{
11 |     console.log("Listening on port 80")
12 | })


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/tut63.js:
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 1 | console.log("Hello world");
 2 | 
 3 | const http = require('http');
 4 | 
 5 | const hostname = '127.0.0.1';
 6 | const port = 3000;
 7 | 
 8 | const server = http.createServer((req, res) => {
 9 |   res.statusCode = 200;
10 |   res.setHeader('Content-Type', 'text/html');
11 | //   res.end('Hello World This is Adam Warlock');
12 |   res.end(`<!DOCTYPE html>
13 |   <html lang="en">
14 |   <head>
15 |       <meta charset="UTF-8">
16 |       <meta name="viewport" content="width=device-width, initial-scale=1.0">
17 |       <meta http-equiv="X-UA-Compatible" content="ie=edge">
18 |       <title>Pseudo selectors & more designing</title>
19 |       <style>
20 |           .container{
21 |               border: 2px solid red;
22 |               background-color: rgb(223, 245, 201);
23 |               padding: 34px;
24 |               margin: 34px auto;
25 |               width: 666px;
26 |           }
27 |           a{
28 |               text-decoration: none;
29 |               color: black;
30 |           }
31 |           a:hover{
32 |               color: rgb(5, 0, 0);
33 |               background-color: rgb(221, 166, 38);
34 |           }
35 |           a:visited{
36 |               background-color: yellow;
37 |           }
38 |           a:active{
39 |               background-color:darkblue;
40 |           }
41 |           .btn{
42 |               font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
43 |               font-weight: bold;
44 |               background-color: crimson;
45 |               padding:6px;
46 |               border: none;
47 |               cursor:pointer;
48 |               font-size: 13px;
49 |               border-radius: 4px;
50 |           }
51 |           .btn:hover{
52 |               color:darkgoldenrod;
53 |               background-color:rgb(223, 245, 201);
54 |               border: 2px solid black;
55 |           }
56 |       </style>
57 |   </head>
58 |   <body>
59 |       <div class="container" id="cont1">
60 |           <h3>This is my heading</h3>
61 |           <p>Lorem ipsum dolor sit amet consectetur adipisicing elit. Obcaecati, reprehenderit. Quam culpa eius aliquam id cumque saepe, provident odio sed eos quia nihil modi error voluptate vero autem quibusdam aperiam exercitationem! Quam, consequuntur velit.</p>
62 |           <a href="https://yahoo.com" class="btn">Read more</a>
63 |           <button class="btn">Contact us</button>
64 |       </div>
65 |   </body>
66 |   </html>`);
67 | });
68 | 
69 | server.listen(port, hostname, () => {
70 |   console.log(`Server running at http://${hostname}:${port}/`);
71 | });


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/tut61.html:
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 1 | <!DOCTYPE html>
 2 | <html lang="en">
 3 | <head>
 4 |     <meta charset="UTF-8">
 5 |     <meta name="viewport" content="width=device-width, initial-scale=1.0">
 6 |     <meta http-equiv="X-UA-Compatible" content="ie=edge">
 7 |     <title>Math Object</title>
 8 | </head>
 9 | <body>
10 |     <div class="container">
11 |         <h1>This is math object tutorial</h1>
12 |     </div>
13 |     <script>
14 |     // Printing the Math Object
15 |     let m = Math;
16 |     console.log(m)
17 | 
18 |     // Printing the constants from Math Object
19 |     console.log("The value of Math.E is ", Math.E)
20 |     console.log("The value of Math.PI is ", Math.PI)
21 |     console.log("The value of Math.LN2 is ", Math.LN2)
22 |     console.log("The value of Math.SQRT1_2 is ", Math.SQRT1_2)
23 |     console.log("The value of Math.LOG2E is ", Math.LOG2E)
24 | 
25 |     // Printing the Functions from Math Object 
26 |     let a = 34.64534;
27 |     let b = 89;
28 | 
29 |     console.log("The value of a and b is ", a, b);
30 |     console.log("The value of a and b rounded is ", Math.round(a), Math.round(b));
31 | 
32 |     console.log("3 raised to the power of 2 is ", Math.pow(3, 2)) 
33 |     console.log("2 raised to the power of 12 is ", Math.pow(2, 12)) 
34 |     console.log("1 raised to the power of 2 is ", Math.pow(1, 2)) 
35 | 
36 |     console.log("Square root of 36 is ", Math.sqrt(36)) 
37 |     console.log("Square root of 64 is ", Math.sqrt(64)) 
38 |     console.log("Square root of 50 is ", Math.sqrt(50)) 
39 | 
40 |     // Ceil and floor
41 |     console.log("5.8 rounded up to nearest integer is ", Math.ceil(5.8)) 
42 |     console.log("5.8 rounded down to nearest integer is ", Math.floor(5.8)) 
43 | 
44 |     // Abs function
45 |     console.log("Absolute value of 5.66 is  ", Math.abs(5.66)) 
46 |     console.log("Absolute value of -5.66 is  ", Math.abs(-5.66))
47 | 
48 |     // Trinonometric Functions
49 |     console.log("The value of sin(pi) is ", Math.sin(Math.PI/2))
50 |     console.log("The value of tan(pi) is ", Math.tan(Math.PI/2))
51 |     console.log("The value of cos(pi) is ", Math.cos(Math.PI/2))
52 | 
53 |     // Min and max functions
54 |     console.log("Minimum value of 4, 5, 6 is ", Math.min(4,5, 6));
55 |     console.log("Minimum value of 14, 5, 16 is ", Math.min(14,5, 16));
56 |     console.log("Maximum value of 4, 5, 6 is ", Math.max(4,5, 6));
57 |     console.log("Maximum value of 14, 5, 16 is ", Math.max(14,5, 16));
58 | 
59 |     // Generating a random number
60 |     let r = Math.random();
61 |     // Random number b/w (a, b) = a + (b-a)*Math.random()
62 |     let a1 = 50;
63 |     let b1 = 60;
64 |     let r50_60 = a1 + (b1-a1)*Math.random();
65 |     console.log("The random number is ", r)
66 |     console.log("The random number is ", r50_60)
67 | 
68 | 
69 | 
70 | 
71 | 
72 |  
73 | 
74 |     </script>
75 | </body>
76 | </html>
77 | 


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