Nodejs getting started

Nodejs getting started

• 1.
  Welcome! Node.js Getting Started <@TrietHo/>
• 2.
  Objectives • After thisseminar, the audiences are able to : • Understand the basic of Node.js and common modules • Create simple Node.js app • Start to learn deeper
• 3.
  Agenda – 1hours • What is Node.js and how it works • Node.js Installation • Node.js project and module structure • Common packages • Host a nodejs app with PM2
• 4.
  What is Node.js •Compare of JS in browser and Node.js (node apps) Chrome Browser V8 JS Engine HTML + CSS + JS … Node.js Async I/O libuv JS V8 JS Engine Event Loop libuv Node Bindings (socket, http, file system,…) Node Standard Library chrome.exe node.exe
• 5.
  What is Node.js HelloWorld! • File: demo.js • Run demo.js
• 6.
  What is Node.js AsyncI/O and Event Loop • Node.js uses an event-driven, non-blocking I/O model • Aka: Callbacks • FileSystem Api as examples: https://nodejs.org/api/fs.html
• 7.
  Installation • Just downloadand install (included npm tool) • https://nodejs.org/en/download/ • Or via package-manager for linux family: • https://nodejs.org/en/download/package-manager/ • npm: Node Package Manager • Find, share, and reuse packages of code from hundreds of thousands of developers • Npm install <package name> [-g ] • -g: install to global that every node apps can use
• 8.
  Project Structure • Basicstructure: • Generate package.json npm init • Advanced structure (use node express for web app): • Express.js (node express): Fast, unopinionated, minimalist web framework for Node.js • http://expressjs.com/en/starter/generator.html
• 9.
  Project Structure package.json • Defineapp metadata and the starting point • npm start in root app folder will exec node bin/www • npm install in root app will download and install the packages in dependences section • The packages are stored in node_modules folder
• 10.
  Module • Organize codebetter • The common pattern: • The list of module patterns: • https://darrenderidder.github.io/talks/ModulePatterns/#/
• 11.
  Common packages • Frameworkfor creating web apps • Express.js: it has a generator to create project, http://expressjs.com/ • Template Engines (Rendering UI for node web apps) • EJS https://www.npmjs.com/package/ejs • Pug (jade) https://pugjs.org/api/getting-started.html • Mustache: https://github.com/janl/mustache.js • Working with asynchronous JS • Assync.js: https://github.com/caolan/async • Promise (bluebird), http://bluebirdjs.com/docs/getting-started.html • Working with database • Mongoose: http://mongoosejs.com/, • mysql: https://github.com/mysqljs/mysql • SQL Server: https://www.npmjs.com/package/mssql
• 12.
  Host a nodeapp with PM2 • PM2 - production process manager for Node.js applications • with a built-in load balancer • keep applications alive forever • reload them without downtime • and to facilitate common system admin tasks • Install PM2 • pm2 start <startpoint.js> • Ref: https://github.com/Unitech/pm2
• 13.
  Others • IDE: anytext editor, Visual Studio Code, notepad++, net beans… • ES6: ECMAScript 6 (aka ECMAScript 2015) • New features of JavaScript language (and including previous version - ES5) • Tutorial: http://ccoenraets.github.io/es6-tutorial/ (new syntax, let, lamda, class, module, promise...) • Unit Test: • get start: https://www.codementor.io/nodejs/tutorial/unit-testing-nodejs-tdd-mocha- sinon • CI: ??? • Flow control: • http://blog.vullum.io/javascript-flow-callback-hell-vs-async-vs-highland/
• 14.
  Questions?
• 15.
  Cafe!