├── .gitignore
├── app.js
├── async-patterns
└── fs-async-await.js
├── built-in-modules
├── content
│ ├── big-text.txt
│ ├── first.txt
│ ├── result-async.txt
│ ├── result-mind-grenade.txt
│ ├── result-sync.txt
│ └── second.txt
├── file-system.js
├── fs-async.js
├── http.js
├── os.js
└── path.js
├── create-big-text-file.js
├── event-emitter.js
├── event-loop-examples
├── readFile.js
├── server.js
├── setInterval.js
└── setTimeout.js
├── express-snippets
└── http-headers.js
├── external-modules.js
├── http-streams.js
├── loadash.js
├── names.js
├── package-lock.json
├── package.json
├── request-event.js
├── streams.js
└── utils.js
/.gitignore:
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1 | /node_modules
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/app.js:
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1 | //3:51:41
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/async-patterns/fs-async-await.js:
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1 | const { readFile, writeFile } = require("fs").promises;
2 | // const util = require('util');
3 |
4 | // const readFilePromise=util.promisify(readFile);
5 | // const writeFilePromise=util.promisify(writeFile);
6 |
7 | const start = async () => {
8 | try {
9 | const first = await readFile(
10 | "../built-in-modules/content/first.txt",
11 | "utf8"
12 | );
13 | const second = await readFile(
14 | "../built-in-modules/content/second.txt",
15 | "utf8"
16 | );
17 | await writeFile(
18 | "../built-in-modules/content/result-mind-grenade.txt",
19 | `This is AWESOME : ${first} ${second}`,
20 | { flag: "a" }
21 | );
22 | console.log(first, second);
23 | } catch (error) {
24 | console.log(error);
25 | }
26 | };
27 | start();
28 | // const getText = (path) => {
29 | // return new Promise((resolve, reject) => {
30 | // readFile(path, "utf8", (err, data) => {
31 | // if (err) {
32 | // reject(err);
33 | // } else {
34 | // resolve(data);
35 | // }
36 | // });
37 | // });
38 | // };
39 |
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/built-in-modules/content/big-text.txt:
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1 | hello world0
2 | hello world1
3 | hello world2
4 | hello world3
5 | hello world4
6 | hello world5
7 | hello world6
8 | hello world7
9 | hello world8
10 | hello world9
11 | hello world10
12 | hello world11
13 | hello world12
14 | hello world13
15 | hello world14
16 | hello world15
17 | hello world16
18 | hello world17
19 | hello world18
20 | hello world19
21 | hello world20
22 | hello world21
23 | hello world22
24 | hello world23
25 | hello world24
26 | hello world25
27 | hello world26
28 | hello world27
29 | hello world28
30 | hello world29
31 | hello world30
32 | hello world31
33 | hello world32
34 | hello world33
35 | hello world34
36 | hello world35
37 | hello world36
38 | hello world37
39 | hello world38
40 | hello world39
41 | hello world40
42 | hello world41
43 | hello world42
44 | hello world43
45 | hello world44
46 | hello world45
47 | hello world46
48 | hello world47
49 | hello world48
50 | hello world49
51 | hello world50
52 | hello world51
53 | hello world52
54 | hello world53
55 | hello world54
56 | hello world55
57 | hello world56
58 | hello world57
59 | hello world58
60 | hello world59
61 | hello world60
62 | hello world61
63 | hello world62
64 | hello world63
65 | hello world64
66 | hello world65
67 | hello world66
68 | hello world67
69 | hello world68
70 | hello world69
71 | hello world70
72 | hello world71
73 | hello world72
74 | hello world73
75 | hello world74
76 | hello world75
77 | hello world76
78 | hello world77
79 | hello world78
80 | hello world79
81 | hello world80
82 | hello world81
83 | hello world82
84 | hello world83
85 | hello world84
86 | hello world85
87 | hello world86
88 | hello world87
89 | hello world88
90 | hello world89
91 | hello world90
92 | hello world91
93 | hello world92
94 | hello world93
95 | hello world94
96 | hello world95
97 | hello world96
98 | hello world97
99 | hello world98
100 | hello world99
101 | hello world0
102 | hello world1
103 | hello world2
104 | hello world3
105 | hello world4
106 | hello world5
107 | hello world6
108 | hello world7
109 | hello world8
110 | hello world9
111 | hello world10
112 | hello world11
113 | hello world12
114 | hello world13
115 | hello world14
116 | hello world15
117 | hello world16
118 | hello world17
119 | hello world18
120 | hello world19
121 | hello world20
122 | hello world21
123 | hello world22
124 | hello world23
125 | hello world24
126 | hello world25
127 | hello world26
128 | hello world27
129 | hello world28
130 | hello world29
131 | hello world30
132 | hello world31
133 | hello world32
134 | hello world33
135 | hello world34
136 | hello world35
137 | hello world36
138 | hello world37
139 | hello world38
140 | hello world39
141 | hello world40
142 | hello world41
143 | hello world42
144 | hello world43
145 | hello world44
146 | hello world45
147 | hello world46
148 | hello world47
149 | hello world48
150 | hello world49
151 | hello world50
152 | hello world51
153 | hello world52
154 | hello world53
155 | hello world54
156 | hello world55
157 | hello world56
158 | hello world57
159 | hello world58
160 | hello world59
161 | hello world60
162 | hello world61
163 | hello world62
164 | hello world63
165 | hello world64
166 | hello world65
167 | hello world66
168 | hello world67
169 | hello world68
170 | hello world69
171 | hello world70
172 | hello world71
173 | hello world72
174 | hello world73
175 | hello world74
176 | hello world75
177 | hello world76
178 | hello world77
179 | hello world78
180 | hello world79
181 | hello world80
182 | hello world81
183 | hello world82
184 | hello world83
185 | hello world84
186 | hello world85
187 | hello world86
188 | hello world87
189 | hello world88
190 | hello world89
191 | hello world90
192 | hello world91
193 | hello world92
194 | hello world93
195 | hello world94
196 | hello world95
197 | hello world96
198 | hello world97
199 | hello world98
200 | hello world99
201 | hello world0
202 | hello world1
203 | hello world2
204 | hello world3
205 | hello world4
206 | hello world5
207 | hello world6
208 | hello world7
209 | hello world8
210 | hello world9
211 | hello world10
212 | hello world11
213 | hello world12
214 | hello world13
215 | hello world14
216 | hello world15
217 | hello world16
218 | hello world17
219 | hello world18
220 | hello world19
221 | hello world20
222 | hello world21
223 | hello world22
224 | hello world23
225 | hello world24
226 | hello world25
227 | hello world26
228 | hello world27
229 | hello world28
230 | hello world29
231 | hello world30
232 | hello world31
233 | hello world32
234 | hello world33
235 | hello world34
236 | hello world35
237 | hello world36
238 | hello world37
239 | hello world38
240 | hello world39
241 | hello world40
242 | hello world41
243 | hello world42
244 | hello world43
245 | hello world44
246 | hello world45
247 | hello world46
248 | hello world47
249 | hello world48
250 | hello world49
251 | hello world50
252 | hello world51
253 | hello world52
254 | hello world53
255 | hello world54
256 | hello world55
257 | hello world56
258 | hello world57
259 | hello world58
260 | hello world59
261 | hello world60
262 | hello world61
263 | hello world62
264 | hello world63
265 | hello world64
266 | hello world65
267 | hello world66
268 | hello world67
269 | hello world68
270 | hello world69
271 | hello world70
272 | hello world71
273 | hello world72
274 | hello world73
275 | hello world74
276 | hello world75
277 | hello world76
278 | hello world77
279 | hello world78
280 | hello world79
281 | hello world80
282 | hello world81
283 | hello world82
284 | hello world83
285 | hello world84
286 | hello world85
287 | hello world86
288 | hello world87
289 | hello world88
290 | hello world89
291 | hello world90
292 | hello world91
293 | hello world92
294 | hello world93
295 | hello world94
296 | hello world95
297 | hello world96
298 | hello world97
299 | hello world98
300 | hello world99
301 |
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/built-in-modules/content/first.txt:
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1 | Hello This is a first text.
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/built-in-modules/content/result-async.txt:
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1 | Here is the result : Hello This is a first text.,Hello This is a second text.
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/built-in-modules/content/result-mind-grenade.txt:
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1 | This is AWESOME : Hello This is a first text. Hello This is a second text.This is AWESOME : Hello This is a first text. Hello This is a second text.This is AWESOME : Hello This is a first text. Hello This is a second text.This is AWESOME : Hello This is a first text. Hello This is a second text.This is AWESOME : Hello This is a first text. Hello This is a second text.This is AWESOME : Hello This is a first text. Hello This is a second text.This is AWESOME : Hello This is a first text. Hello This is a second text.
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/built-in-modules/content/result-sync.txt:
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1 | Append here: Here is the result : Hello This is a first text., Hello This is a second text.
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/built-in-modules/content/second.txt:
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1 | Hello This is a second text.
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/built-in-modules/file-system.js:
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1 | const {readFileSync, writeFileSync}=require('fs')
2 | const first = readFileSync('./content/first.txt','utf-8')
3 | const second = readFileSync('./content/second.txt','utf8')
4 | console.log(first,second);
5 |
6 | writeFileSync('./content/result-sync.txt',`Here is the result : ${first}, ${second}`,{flag:'a'})
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/built-in-modules/fs-async.js:
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1 | const { readFile, writeFile } = require("fs");
2 | console.log('start');
3 | readFile("./content/first.txt", "utf8", (err, result) => {
4 | if (err) {
5 | console.log(err);
6 | }
7 | const first = result;
8 | readFile("./content/second.txt", "utf8", (err, result) => {
9 | if (err) {
10 | console.log(err);
11 | return;
12 | }
13 | const second = result;
14 | writeFile('./content/result-async.txt',`Here is the result : ${first},${second}`,(err,result)=>{
15 | if(err){
16 | console.log(err);
17 | return
18 | }
19 | console.log('done with this task');
20 | })
21 | });
22 | });
23 | // readFile("./content/first.txt", "utf8", (result, err) => {
24 | // if (err) {
25 | // console.log(err);
26 | // }
27 | // console.log('done with this task');
28 |
29 | // })
30 | console.log('starting another task');
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/built-in-modules/http.js:
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1 | const http = require('http');
2 | const server = http.createServer((req,res)=>{
3 | if(req.url==='/'){
4 | res.end("Welcome back!");
5 | }
6 | if(req.url==='/contact'){
7 | res.end("Contact us through : ");
8 | }
9 | if(req.url==='/about'){
10 | res.end("Here is our short history");
11 | }
12 | res.end(`Oops!
13 | We can not find the page you are looking for
14 | back home`)
15 |
16 |
17 | })
18 |
19 | server.listen(5000);
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/built-in-modules/os.js:
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1 | const { log } = require('console');
2 | const os=require('os');
3 | const user=os.userInfo();
4 | console.log(user);
5 | console.log(`The system uptime is ${os.uptime()} seconds.`);
6 | const currentOS={
7 | name: os.type(),
8 | release: os.release(),
9 | totalMem: os.totalmem(),
10 | freeMem: os.freemem(),
11 | }
12 | console.log(currentOS);
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/built-in-modules/path.js:
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1 | const path = require('path')
2 | console.log(path.sep);
3 |
4 | const filePath= path.join('/built-in-modules','os.js')
5 | console.log(filePath);
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/create-big-text-file.js:
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1 | const {writeFileSync}=require('fs')
2 |
3 | for(let i=0; i<100; i++){
4 | writeFileSync('./built-in-modules/content/big-text.txt',`hello world${i}\n`,{flag:'a'})
5 | }
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/event-emitter.js:
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1 | const EventEmitter = require('events');
2 | const customEmitter = new EventEmitter();
3 | customEmitter.on("response",(name,id)=>{
4 | console.log(`data received from the user with name: ${name} and id: ${id}`);
5 | })
6 | customEmitter.on("response",()=>{
7 | console.log(`some other logic here`);
8 | })
9 |
10 | //order matters, first listen then will emit the event.
11 | //additional arguments
12 |
13 | customEmitter.emit("response",'ali',23)
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/event-loop-examples/readFile.js:
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1 | const {readFile} = require('fs');
2 |
3 | console.log("started first week");
4 |
5 | //Check File Path:
6 |
7 | readFile('../built-in-modules/content/first.txt','utf8',(err,result)=>{
8 | if(err){
9 | console.log(err);
10 | return
11 | }
12 | console.log(result);
13 | console.log('completed first task');
14 | })
15 |
16 | console.log('starting next task.');
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/event-loop-examples/server.js:
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1 | const http = require("http");
2 | const server = http.createServer((req, res) => {
3 | if (req.url === "/") {
4 | res.end("Home Page.");
5 | return
6 | }
7 | if (req.url === "/about") {
8 | //BLOCKING CODE!!!!
9 | for(let i=0; i<10; i++){
10 | for(let j=0; j<1000; j++){
11 | console.log(`${i} ${j}`);
12 | }
13 | }
14 | res.end("About Page.");
15 | return
16 | }
17 | res.end('Error Page.')
18 | });
19 |
20 | server.listen(5000,()=>{
21 | console.log('server is listening on port 5000...');
22 | })
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/event-loop-examples/setInterval.js:
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1 | setInterval(()=>{
2 | console.log('js is synchronous.');
3 | },2000)
4 |
5 | console.log('I will run fast');
6 | //process stays alive unless:
7 | //Kill process CTRL+C
8 | //unexpected error
--------------------------------------------------------------------------------
/event-loop-examples/setTimeout.js:
--------------------------------------------------------------------------------
1 | //starting system process
2 | console.log('first');
3 |
4 | setTimeout(()=>{
5 | console.log('second');
6 | },0)
7 |
8 | console.log('third');
9 | //completed and exiting
--------------------------------------------------------------------------------
/express-snippets/http-headers.js:
--------------------------------------------------------------------------------
1 | const http = require("http");
2 | //4.32.23
3 | const server = http.createServer((req, res) => {
4 | // console.log(req);
5 | // console.log(res);
6 | const url = req.url;
7 | if (url === "/") {
8 | res.writeHead(200, { "content-type": "text/html" });
9 | res.write('Home Page
');
10 | res.end();
11 | } else if (url === "/about") {
12 | res.writeHead(200, { "content-type": "text/html" });
13 | res.write('about
');
14 | res.end();
15 | }
16 | else{
17 | res.writeHead(404,{'content-type':'text/html'});
18 | res.write(`Page not Found 404.
`)
19 | res.end();
20 | }
21 | });
22 |
23 | server.listen(5000);
24 |
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/external-modules.js:
--------------------------------------------------------------------------------
1 | // console.log(module);
2 | const names = require('./names')
3 | const greeting=require('./utils')
4 | // console.log(greeting);
5 | let omer = 'omer'
6 | const data = require('./names')
7 | console.log(data);
8 | // greeting(names.bilal);
9 | // greeting(names.ali);
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/http-streams.js:
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1 | let http = require('http');
2 | let fs = require('fs');
3 |
4 | http.createServer(function(req,res){
5 | const fileStream=fs.createReadStream('./built-in-modules/content/big-text.txt','utf8');
6 | fileStream.on('open',()=>{
7 | fileStream.pipe(res)
8 | })
9 |
10 | fileStream.on('error',(err)=>{
11 | res.end(err);
12 | })
13 | // const text=fs.readFileSync('./built-in-modules/content/big-text.txt','utf8')
14 | // res.end(text)
15 |
16 | }).listen(5000)
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/loadash.js:
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1 | const l = require("lodash");
2 | const items = [1, [2, [3, [4]]]];
3 | const newItems=l.flattenDeep(items);
4 | console.log(newItems);
5 |
--------------------------------------------------------------------------------
/names.js:
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1 | module.exports.items=['item1','item2'];
2 | const person ={
3 | name:'Ahmed'
4 | }
5 |
6 | const ali = 'Ali';
7 | const tahir = 'Tahir';
8 | const bilal = 'Bilal'
9 |
10 | module.exports.myPerson=person;
11 | module.exports={ali,bilal}
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/package-lock.json:
--------------------------------------------------------------------------------
1 | {
2 | "name": "node-and-express-js",
3 | "version": "1.0.0",
4 | "lockfileVersion": 3,
5 | "requires": true,
6 | "packages": {
7 | "": {
8 | "name": "node-and-express-js",
9 | "version": "1.0.0",
10 | "license": "ISC",
11 | "dependencies": {
12 | "lodash": "^4.17.21"
13 | }
14 | },
15 | "node_modules/lodash": {
16 | "version": "4.17.21",
17 | "resolved": "https://registry.npmjs.org/lodash/-/lodash-4.17.21.tgz",
18 | "integrity": "sha512-v2kDEe57lecTulaDIuNTPy3Ry4gLGJ6Z1O3vE1krgXZNrsQ+LFTGHVxVjcXPs17LhbZVGedAJv8XZ1tvj5FvSg=="
19 | }
20 | }
21 | }
22 |
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/package.json:
--------------------------------------------------------------------------------
1 | {
2 | "name": "node-and-express-js",
3 | "version": "1.0.0",
4 | "description": "",
5 | "main": "app.js",
6 | "scripts": {
7 | "test": "echo \"Error: no test specified\" && exit 1",
8 | "start":"nodemon app.js"
9 | },
10 | "keywords": [],
11 | "author": "",
12 | "license": "ISC",
13 | "dependencies": {
14 | "lodash": "^4.17.21"
15 | }
16 | }
17 |
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/request-event.js:
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1 | const http = require('http');
2 | const server=http.createServer();
3 |
4 | server.on('request',((req,res)=>{
5 | res.end('Welcome')
6 | }))
7 |
8 | server.listen(5000)
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/streams.js:
--------------------------------------------------------------------------------
1 | const {createReadStream}=require('fs');
2 |
3 | const stream = createReadStream('./built-in-modules/content/big-text.txt',{highWaterMark:1000,encoding:'utf8'});
4 |
5 | //default 64kb
6 | //last buffer is a remainder
7 | //highWaterMark - control size
8 |
9 | stream.on('data',(result)=>{
10 | console.log(result);
11 | })
12 |
13 | stream.on('error',(err)=>{
14 | console.log(err);
15 | })
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/utils.js:
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1 | const greeting =(name)=>{
2 | console.log(`hey! ${name}`);
3 | }
4 | module.exports=greeting;
--------------------------------------------------------------------------------