├── README.md
├── Node-modules
    ├── modules-example
    │   ├── response.js
    │   ├── request.js
    │   └── https.js
    └── http-example.js
└── Events
    └── event.js


/README.md:
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1 | The main advantage to using setImmediate() over setTimeout() is setImmediate() will always be executed before any timers if scheduled within an I/O cycle, independently of how many timers are present.


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/Node-modules/modules-example/response.js:
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 1 | function decrypt(data) {
 2 |     return 'decrypted data'
 3 | }
 4 | 
 5 | function read() {
 6 |     return decrypt('data')
 7 | }
 8 | 
 9 | module.exports = {
10 |     read,
11 | }


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/Node-modules/modules-example/request.js:
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 1 | function encrypt(data) {
 2 |     return 'encrypted data';
 3 | }
 4 | 
 5 | function send(url, data) {
 6 |     const encryptedData = encrypt(data);
 7 |     console.log(`sending ${encryptedData} to ${url}`)
 8 | }
 9 | 
10 | module.exports = {
11 |     send,
12 | }


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/Node-modules/http-example.js:
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 1 | // example 1
 2 | 
 3 | const {get}= require('https');
 4 | 
 5 | get('https://www.google.com', (res) => {
 6 |     res.on('data', (chunk) => {
 7 |         console.log(`Data chunk: ${chunk}`)
 8 |     });
 9 |     res.on('end', () => {
10 |         console.log('No more data')
11 |     });
12 | });
13 | 
14 | 


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/Node-modules/modules-example/https.js:
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 1 | const request = require('./request')
 2 | const response = require('./response')
 3 | 
 4 | function makeRequest(url, data) {
 5 |     request.send(url, data)
 6 |     return response.read()
 7 | }
 8 | 
 9 | const responseData = makeRequest('https//google.com','hello')
10 | console.log(responseData)


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/Events/event.js:
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  1 | 
  2 | setTimeout(() => {
  3 |   console.log("outTime")
  4 | }, 0);
  5 | 
  6 | setImmediate(() => {
  7 |   console.log("hello")
  8 | })
  9 | 
 10 | // timeout_vs_immediate.js
 11 | const fs = require('node:fs');
 12 | 
 13 | fs.readFile(__filename, () => {
 14 |   setTimeout(() => {
 15 |     console.log('timeout');
 16 |   }, 0);
 17 |   setImmediate(() => {
 18 |     console.log('immediate');
 19 |   });
 20 | });
 21 | 
 22 | 
 23 | // const server = net.createServer();
 24 | // server.on('connection', conn => {});
 25 | 
 26 | // server.listen(8080);
 27 | // server.on('listening', () => {});
 28 | 
 29 | // const EventEmitter = require('node:events');
 30 | 
 31 | // class MyEmitter extends EventEmitter {
 32 | //   constructor() {
 33 | //     super();
 34 | 
 35 | //     // use nextTick to emit the event once a handler is assigned
 36 | //     process.nextTick(() => {
 37 | //       this.emit('event');
 38 | //     });
 39 | //   }
 40 | // }
 41 | 
 42 | // const myEmitter = new MyEmitter();
 43 | // myEmitter.on('event', () => {
 44 | //   console.log('an event occurred!');
 45 | // });
 46 | 
 47 | 
 48 | // const EventEmitter = require('node:events');
 49 | 
 50 | // class MyEmitter extends EventEmitter {}
 51 | 
 52 | // const myEmitter = new MyEmitter();
 53 | // myEmitter.on('event', () => {
 54 | //   console.log('an event occurred!');
 55 | // });
 56 | // myEmitter.emit('event');
 57 | 
 58 | // Passing arguments and this to listeners
 59 | // const EventEmitter = require('node:events');
 60 | // class MyEmitter extends EventEmitter {}
 61 | // const myEmitter = new MyEmitter();
 62 | // myEmitter.on('event', (a, b) => {
 63 | //   console.log(a, b, this);
 64 | //   // Prints: a b {}
 65 | // });
 66 | // myEmitter.emit('event', 'a', 'b');
 67 | 
 68 | // Asynchronous vs. synchronous
 69 | 
 70 | // const EventEmitter = require('node:events');
 71 | // class MyEmitter extends EventEmitter {}
 72 | // const myEmitter = new MyEmitter();
 73 | // myEmitter.on('event', (a, b) => {
 74 | //   setImmediate(() => {
 75 | //     console.log('this happens asynchronously');
 76 | //   });
 77 | // });
 78 | // myEmitter.emit('event', 'a', 'b');
 79 | 
 80 | // Handling events only once
 81 | // const EventEmitter = require('node:events');
 82 | // class MyEmitter extends EventEmitter { }
 83 | // const myEmitter = new MyEmitter();
 84 | // let m = 0;
 85 | // myEmitter.on('event', () => {
 86 | //   console.log(++m);
 87 | // });
 88 | // myEmitter.emit('event');
 89 | // // Prints: 1
 90 | // myEmitter.emit('event');
 91 | // // Prints: 2
 92 | 
 93 | const EventEmitter = require('events');
 94 | const celebrity = new EventEmitter();
 95 | 
 96 | celebrity.on('race', (results) => {
 97 |   if (results === 'win') {
 98 |     console.log('Congrats');
 99 |   }
100 | });
101 | 
102 | celebrity.on('race', (results) => {
103 |   if (results === 'win') {
104 |     console.log('Boo! I could have done better than that!');
105 |   }
106 | 
107 | });
108 | 
109 | celebrity.on('race', (results) => {
110 |   if (results === 'lost') {
111 |     console.log("oops you lost")
112 |   }
113 | })
114 | 
115 | process.on('exit', (code) => {
116 |   console.log('Process exit event with code:', code);
117 | });
118 | 
119 | 
120 | celebrity.emit('race', 'win');
121 | celebrity.emit('race', 'lost');


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