├── readme.md
├── Goodnotes 2.pdf
├── demo6.js
├── demo1.js
├── demo5.js
├── demo3.js
├── demo2.js
├── demo7.js
└── demo4.js


/readme.md:
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1 | Please donot touch me


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/Goodnotes 2.pdf:
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https://raw.githubusercontent.com/singhsanket143/Node_Js_Adv/HEAD/Goodnotes 2.pdf


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/demo6.js:
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 1 | const fs = require('fs');
 2 | 
 3 | fs.readFile('./readme.md', 'utf8', (err, data) => { // I/O queue - Callback queue 
 4 |     if (err) {
 5 |       console.error(err);
 6 |       return;
 7 |     }
 8 |     console.log(data);
 9 | });
10 | 
11 | setTimeout(() => console.log("Timer 1"), 0);
12 | 


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/demo1.js:
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1 | let a = 10;
2 | Promise.resolve().then(() => console.log("Printing from promise"));
3 | process.nextTick(() => console.log("printing from nextTick"));
4 | process.nextTick(() => console.log("printing from nextTick 1"));
5 | process.nextTick(() => console.log("printing from nextTick 2"));
6 | setTimeout(() => console.log("printing from timer"), 0);
7 | for(let i = 0; i < 10000000000; i++) {}
8 | console.log(a);


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/demo5.js:
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 1 | const fs = require('fs');
 2 | 
 3 | fs.readFile('./readme.md', 'utf8', (err, data) => { // I/O queue - Callback queue 
 4 |     if (err) {
 5 |       console.error(err);
 6 |       return;
 7 |     }
 8 |     console.log(data);
 9 | });
10 | 
11 | process.nextTick(() => console.log("Next tick"));
12 | Promise.resolve().then(() => console.log("Promise 1"));
13 | setTimeout(() => console.log("Timer 1"), 0);
14 | setImmediate(() => console.log("Immediate callback"));
15 | 
16 | for(let i = 0 ; i < 10000000000; i++ ) {} // > 5s


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/demo3.js:
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 1 | console.log("Start");
 2 | 
 3 | setTimeout(() => {
 4 |     process.nextTick(() => console.log("Next Tick 2")); // cb will be waiting in nextTick queue
 5 | }, 0); // cb will be waiting in timer queue
 6 | 
 7 | Promise.resolve().then(() => console.log("Promise 1")); // cb will be waiting in promise queue
 8 | 
 9 | process.nextTick(() => console.log("Next Tick 1")); // cb will be waiting in nextTick queue
10 | 
11 | setTimeout(() => console.log("Timer 2"), 0); // cb will be waiting in timer queue
12 | 
13 | 
14 | console.log("end");


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/demo2.js:
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 1 | console.log("Start");
 2 | 
 3 | setTimeout(() => console.log("Timer 1"), 0); // cb will be waiting in timer queue
 4 | 
 5 | Promise.resolve().then(() => console.log("Promise 1")); // cb will be waiting in promise queue
 6 | 
 7 | process.nextTick(() => console.log("Next Tick 1")); // cb will be waiting in nextTick queue
 8 | 
 9 | setTimeout(() => console.log("Timer 2"), 0); // cb will be waiting in timer queue
10 | 
11 | process.nextTick(() => console.log("Next Tick 2")); // cb will be waiting in nextTick queue
12 | 
13 | for(let i = 0; i < 10000000000; i++) {} // by the time this loop completes all the callbacks are in their respective queues
14 | 
15 | console.log("end");


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/demo7.js:
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 1 | const fs = require('fs');
 2 | 
 3 | fs.readFile('./readme.md', 'utf8', (err, data) => { // I/O queue - Callback queue 
 4 |     if (err) {
 5 |       console.error(err);
 6 |       return;
 7 |     }
 8 |     process.nextTick(() => console.log("next tick from file read"));
 9 |     console.log(data);
10 | });
11 | 
12 | fs.readFile('./readme.md', 'utf8', (err, data) => { // I/O queue - Callback queue 
13 |     if (err) {
14 |       console.error(err);
15 |       return;
16 |     }
17 |     process.nextTick(() => console.log("next tick from file read 2"));
18 |     console.log("2:", data);
19 | });
20 | 
21 | 
22 | process.nextTick(() => console.log("Next tick"));
23 | Promise.resolve().then(() => console.log("Promise 1"));
24 | setTimeout(() => console.log("Timer 1"), 0);
25 | setImmediate(() => console.log("Immediate callback"));
26 | 
27 | for(let i = 0 ; i < 10000000000; i++ ) {} // > 5s


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/demo4.js:
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 1 | console.log("Start");
 2 | 
 3 | setTimeout(() => {
 4 |     process.nextTick(() => console.log("Next Tick 2")); // cb will be waiting in nextTick queue
 5 |     process.nextTick(() => console.log("Next Tick 3"));
 6 |     process.nextTick(() => console.log("Next Tick 4"));
 7 |     Promise.resolve().then(() => console.log("Promise 2"));
 8 |     Promise.resolve().then(() => console.log("Promise 3"));
 9 |     Promise.resolve().then(() => console.log("Promise 4"));
10 |     for(let i = 0; i < 10000000000; i++) {} 
11 | 
12 | }, 0); // cb will be waiting in timer queue
13 | 
14 | Promise.resolve().then(() => console.log("Promise 1")); // cb will be waiting in promise queue
15 | 
16 | process.nextTick(() => console.log("Next Tick 1")); // cb will be waiting in nextTick queue
17 | 
18 | setTimeout(() => console.log("Timer 2"), 0); // cb will be waiting in timer queue
19 | 
20 | 
21 | console.log("end");


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