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Node36

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beshoy semsem

Node.js is a JavaScript runtime built on Chrome's V8 JavaScript engine. It uses an event-driven, non-blocking I/O model that makes it lightweight and efficient. Node.js has the largest ecosystem of open source libraries due to its package manager npm. The document discusses using Node.js because developers already know JavaScript, its performance advantages, and tools like npm. It also provides instructions on installing Node.js and the Node Version Manager (nvm), and explains common Node.js commands.

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Node.js BESHOY SEMSEM
Node.js Node.js® is a JavaScript runtime built on Chrome's V8 JavaScript engine. Node.js uses an event-driven, non-blocking I/O model that makes it lightweight and efficient. Node.js' package ecosystem, npm, is the largest ecosystem of open source libraries in the world.
Node36
Why Use Node.js 1. You Already Know JavaScript 2. It's Fast 1. Node.js is a JavaScript runtime that uses the V8 engine developed by Google for use in Chrome. 3.Tooling (NPM) 4.Real-time Made Easy 5.One Codebase And Your Real time For Free 1. https://www.meteor.com/
Nodejs installation Node Version Manager The Node Version Manager allows admins to easily manage node.js versions. It’s a bash script that has the capability to manage multiple active versions of node.js, with functionality such as: installation, executing commands with specific node.js versions, setting the PATH variable to use a specific node.js versions curl -o- https://raw.githubusercontent.com/creationix/nvm/v0.31.0/i nstall.sh | bash
Let us know. What is the meaning of these commands?  nvm install  nvm use  nvm current  nvm ls  nvm alias default
JavaScript & Node.js Only in Javascript window location document Only in Node.js global process module
Node36
Create Server var http = require('http'); var handleRequest = function (req, res) { res.writeHead(200, {'Content-Type': 'text/plain'}); res.end('Welcome to ITI Intake36 n'); }; var server = http.createServer(handleRequest); server.listen(3000, 'localhost');
Node36
Create Server var http = require('http'); To require modules What is The difference between var http = require('http'); AND var http = require('./http');
Create Server  function (req, res) Res.writeHead Res.writeHead Res.end Server.listen
Exports exports vs module.exports
Node36
NPM  npm install  npm init  npm publish  npm login  npm adduser
Callback Node.js is a JavaScript runtime built on Chrome's V8 JavaScript engine. Node.js uses an event-driven, non-blocking I/O mode Callback is an asynchronous equivalent for a function. A callback function is called at the completion of a given task.
Callback var fs = require("fs"); fs.readFile('input.txt', function (err, data) { if (err) return console.error(err); console.log(data.toString()); }); console.log("Program Ended");
callback var fs = require("fs"); var data = fs.readFileSync('input.txt'); console.log(data.toString()); console.log("Program Ended");
Streams Streams are objects that let you read data from a source or write data to a destination in continuous fashion.
In Node.js, there are four types of streams Readable - Stream which is used for read operation. Writable - Stream which is used for write operation. Duplex - Stream which can be used for both read and write operation. Transform - A type of duplex stream where the output is computed based on input.
var fs = require("fs"); var data = ''; var readerStream = fs.createReadStream('input.txt'); readerStream.setEncoding('UTF8'); readerStream.on('data', function(chunk) { data += chunk; }); readerStream.on('end',function(){ console.log(data); }); readerStream.on('error', function(err){ console.log(err.stack); }); console.log("Program Ended");
Web Application Architecture
Create own web server
var http = require('http'); var fs = require('fs'); var url = require('url'); http.createServer( function (req, res) { var pathname = url.parse(req.url).pathname; fs.readFile(pathname.substr(1), function (err, data) { if (err) { console.log(err); res.writeHead(404, {'Content-Type': 'text/html'}); }else{ res.writeHead(200, {'Content-Type': 'text/html'}); res.write(data.toString()); } res.end(); }); }).listen(3000);
CONNECT TO DATA BASE we will used mysql data base and we will use mysql module https://www.npmjs.com/package/mysql
CONNECT TO DATABASE var mysql = require('mysql'); var connection = mysql.createConnection({ host: 'localhost', user: 'root', password: 'iti' }); connection.query('SELECT * from books', function(err, rows, fields) { if (err) throw err; console.log('The solution is: ', rows[0].solution); }); connection.end();
Web service A web service is any piece of software that makes itself available over the internet
REST Representational State Transfer (REST) is a software architecture style consisting of guidelines and best practices for creating scalable web services.
RESTful API HTTP methods GET POST DELETE PUT
Create web service request response logic format
Thank you :) create server can handle crud operation

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Node36

  • 2. Node.js Node.js® is a JavaScript runtime built on Chrome's V8 JavaScript engine. Node.js uses an event-driven, non-blocking I/O model that makes it lightweight and efficient. Node.js' package ecosystem, npm, is the largest ecosystem of open source libraries in the world.
  • 4. Why Use Node.js 1. You Already Know JavaScript 2. It's Fast 1. Node.js is a JavaScript runtime that uses the V8 engine developed by Google for use in Chrome. 3.Tooling (NPM) 4.Real-time Made Easy 5.One Codebase And Your Real time For Free 1. https://www.meteor.com/
  • 5. Nodejs installation Node Version Manager The Node Version Manager allows admins to easily manage node.js versions. It’s a bash script that has the capability to manage multiple active versions of node.js, with functionality such as: installation, executing commands with specific node.js versions, setting the PATH variable to use a specific node.js versions curl -o- https://raw.githubusercontent.com/creationix/nvm/v0.31.0/i nstall.sh | bash
  • 6. Let us know. What is the meaning of these commands?  nvm install  nvm use  nvm current  nvm ls  nvm alias default
  • 7. JavaScript & Node.js Only in Javascript window location document Only in Node.js global process module
  • 9. Create Server var http = require('http'); var handleRequest = function (req, res) { res.writeHead(200, {'Content-Type': 'text/plain'}); res.end('Welcome to ITI Intake36 n'); }; var server = http.createServer(handleRequest); server.listen(3000, 'localhost');
  • 11. Create Server var http = require('http'); To require modules What is The difference between var http = require('http'); AND var http = require('./http');
  • 12. Create Server  function (req, res) Res.writeHead Res.writeHead Res.end Server.listen
  • 15. NPM  npm install  npm init  npm publish  npm login  npm adduser
  • 16. Callback Node.js is a JavaScript runtime built on Chrome's V8 JavaScript engine. Node.js uses an event-driven, non-blocking I/O mode Callback is an asynchronous equivalent for a function. A callback function is called at the completion of a given task.
  • 17. Callback var fs = require("fs"); fs.readFile('input.txt', function (err, data) { if (err) return console.error(err); console.log(data.toString()); }); console.log("Program Ended");
  • 18. callback var fs = require("fs"); var data = fs.readFileSync('input.txt'); console.log(data.toString()); console.log("Program Ended");
  • 19. Streams Streams are objects that let you read data from a source or write data to a destination in continuous fashion.
  • 20. In Node.js, there are four types of streams Readable - Stream which is used for read operation. Writable - Stream which is used for write operation. Duplex - Stream which can be used for both read and write operation. Transform - A type of duplex stream where the output is computed based on input.
  • 21. var fs = require("fs"); var data = ''; var readerStream = fs.createReadStream('input.txt'); readerStream.setEncoding('UTF8'); readerStream.on('data', function(chunk) { data += chunk; }); readerStream.on('end',function(){ console.log(data); }); readerStream.on('error', function(err){ console.log(err.stack); }); console.log("Program Ended");
  • 23. Create own web server
  • 24. var http = require('http'); var fs = require('fs'); var url = require('url'); http.createServer( function (req, res) { var pathname = url.parse(req.url).pathname; fs.readFile(pathname.substr(1), function (err, data) { if (err) { console.log(err); res.writeHead(404, {'Content-Type': 'text/html'}); }else{ res.writeHead(200, {'Content-Type': 'text/html'}); res.write(data.toString()); } res.end(); }); }).listen(3000);
  • 25. CONNECT TO DATA BASE we will used mysql data base and we will use mysql module https://www.npmjs.com/package/mysql
  • 26. CONNECT TO DATABASE var mysql = require('mysql'); var connection = mysql.createConnection({ host: 'localhost', user: 'root', password: 'iti' }); connection.query('SELECT * from books', function(err, rows, fields) { if (err) throw err; console.log('The solution is: ', rows[0].solution); }); connection.end();
  • 27. Web service A web service is any piece of software that makes itself available over the internet
  • 28. REST Representational State Transfer (REST) is a software architecture style consisting of guidelines and best practices for creating scalable web services.
  • 29. RESTful API HTTP methods GET POST DELETE PUT
  • 31. Thank you :) create server can handle crud operation