Introduction to Node.js

This document contains information about EventMachine and the reactor pattern in Ruby. It discusses how EventMachine implements the reactor pattern to allow non-blocking and asynchronous I/O in Ruby. It provides examples of how to use EventMachine to run code asynchronously using callbacks, timers, queues, and fibers to avoid "callback hell". The document also lists several other languages and frameworks that use the reactor pattern for asynchronous programming.

Node.js is a JavaScript runtime built on Chrome's V8 engine that uses asynchronous and event-driven programming to build fast and scalable network applications. It allows for non-blocking I/O operations through a callback pattern to prevent slow operations from blocking other operations. Node.js uses a single thread event loop model that handles concurrent operations without blocking. It can be used to build HTTP servers, watch files for changes, interface with databases like MongoDB, and create real-time web applications using web sockets. Node.js is well suited for real-time applications, APIs, and streaming but not for CPU intensive or data transformation tasks.

This document discusses best practices for scalable nginx configuration. It begins by comparing nginx's location-based configuration to Apache's more complex configuration using various containers. The document then outlines nginx's configuration including using server blocks, locations by prefix, regular expressions, and inheritance. It emphasizes keeping similar locations together, using inclusive locations, and avoiding rewrites or unnecessary "if" blocks for improved performance and scalability.

This document provides an overview and introduction to Node.js. It discusses that Node.js is a platform for building scalable network applications using JavaScript and uses non-blocking I/O and event-driven architecture. It was created by Ryan Dahl in 2009 and uses Google's V8 JavaScript engine. Node.js allows building web servers, networking tools and real-time applications easily and efficiently by handling concurrent connections without threads. Some popular frameworks and modules built on Node.js are also mentioned such as Express.js, Socket.IO and over 1600 modules in the npm registry.

This document outlines labs for learning Node.js and Express.js. Lab 01 focuses on Node.js, with exercises on installing Node.js, writing basic console, HTTP, TCP, and UDP applications. Lab 02 covers Express.js, including installing and configuring Express.js, generating an Express application, and using MySQL with Express. Each exercise provides code snippets and links to video tutorials.

This document contains information about Ricardo Silva's background and areas of expertise. It includes his degree in Computer Science from ISTEC and MSc in Computation and Medical Instrumentation from ISEP. It also notes that he works as a Software Developer at Shortcut, Lda and maintains a blog and email contact for Node.js topics. The document then covers several JavaScript, Node.js and Websockets topics through examples and explanations in 3 sentences or less each.

This document contains code snippets and graphs demonstrating the difference between synchronous and asynchronous functions in JavaScript. It shows how synchronous functions like crypto.pbkdf2Sync block further code execution, while asynchronous functions like crypto.pbkdf2 and https.request allow other work to continue in parallel and complete faster overall.

The document discusses various methods for connecting to a network and downloading content in Android, including checking network connectivity, performing long operations off the main thread using AsyncTask, downloading content from URLs, and considerations around using HttpClient versus HttpURLConnection. It provides code examples for tasks like retrieving the device IP address, disabling HTTP connection reuse, and handling gzip encoding.

This document provides an overview of Node.js basics like running a simple "Hello World" program, using the Node Package Manager (NPM) to install packages, debugging with node-inspector, and using the Express framework to build web applications. It also covers using MongoDB and the Mongoose ODM to interface with MongoDB to create, retrieve, and save documents to a database in Express applications.

Avoid the callback hell and improve on promises in node.js and JavaScript by using the new ES6 generators. This presentation will show you before and after code examples that will illustrate the full benefit of using this new syntax.

This document discusses Node.js modules and the Node Package Manager (NPM). It explains that modules are defined using one .js file, and objects not assigned to exports are private. It also covers module loading using require(), module encapsulation, module identifiers, the node_modules search path, the package.json format, dependencies, and basic NPM commands like install, uninstall, search, and publish.

Node.js is an environment for developing high-performance web services using JavaScript on the server-side. It uses Google's V8 JavaScript engine and an event-driven, non-blocking I/O model that makes it lightweight and efficient, especially for real-time web applications with many concurrent connections. Common programming techniques in Node.js include asynchronous I/O with callbacks, event-driven programming, and a common module system for building reusable components.