Meetup RomaJS - introduzione interattiva a Node.js - Luca Lanziani - Codemotion Rome 2017

Apr 3, 20170 likes466 views

Da ormai qualche anno Node.js sta prendendo sempre più piede sia in ambito startup che in ambito enterprise, cerchiamo di capire insieme di cosa si tratta, quali sono le sue caratteristiche principali e dove questo tool può dare il meglio di sé. Inizieremo da una introduzione del JavaScript runtime, descrivendo il suo sistema di I/O non bloccante e le principali funzionalità che mette a disposizione. Passeremo poi all'enorme ecosistema di librerie (NPM), mostrando le più famose e il loro utilizzo.

Introduzione a NodeJs
@lucalanziani
ROME 24-25 MARCH 2017

Meetup RomaJS - introduzione interattiva a Node.js - Luca Lanziani - Codemotion Rome 2017

Node - what
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.

Node - start
nodejs.org/en/docs/
nodejs.org/en/docs/guides/

Node – “wow” server
var http = require('http');
http.createServer(function(req, res) {
res.end(req.method);
}).listen(1337);

Node – echo server
var http = require('http');
http.createServer(function(req, res) {
var bd = [];
req.on('data', function(chunk) {
b.push(chunk);
}).on('end', function() {
res.end(Buffer.concat(bd).toString());
});
}).listen(1337);

Node – moar
✔
File system
✔
Crypto
✔
Events
✔
Modules
✔
Net
✔
UDP / Datagram Sockets
✔
Etc (https://nodejs.org/docs/latest-v5.x/api/)

Node – sync/async
const fs = require('fs');
const data = fs.readFileSync('./code.js');
console.log(data);
console.log('More work');

Node – sync/async
const fs = require('fs');
fs.readFile('./code.js', (err, data) => {
if (err) throw err;
console.log(data.toString());
});
console.log('More work');

Node – events
const EventEmitter = require('events');
const util = require('util');
function MyEmitter() {
EventEmitter.call(this);
process.nextTick(function () {
this.emit('event');
}.bind(this));
}
util.inherits(MyEmitter, EventEmitter);

Node – NPM
https://www.npmjs.com/

This 15 minute presentation discusses non-blocking I/O, event loops, and Node.js. It builds on previous work by Ryan Dahl, explaining how threads can be expensive due to context switching and memory usage, and how Node.js uses an event-driven, non-blocking model to avoid these costs. Code examples demonstrate getting and printing a policy object, handling HTTP requests asynchronously without blocking additional connections, and using callbacks to chain asynchronous actions together.

Universal JS Web Applications with React - Luciano Mammino - Codemotion Rome ...Luciano Mammino

This document outlines a presentation about building universal JavaScript web applications with React. It discusses: 1. The term "universal" in relation to JavaScript and some advantages it provides like maintainability and faster load times. 2. Building a frontend single page application with React and then making it universal by rendering on the server as well with React and Express. 3. Key aspects of universal apps like module sharing, routing, data retrieval and state management that work across client and server. 4. An example of building a universal JavaScript app with React called "Judo Heroes" that shows athlete data and profiles, using components, routing, data and building tools like Babel and Webpack.

Nodejs introNdjido Ardo BAR

JavaScript was created in 1995 and became a standard in 1997. Node.js was created in 2009 using Google's V8 JavaScript engine, allowing JavaScript to be used for server-side applications. Node.js is well-suited for building scalable web servers, APIs, and real-time applications due to its asynchronous, non-blocking architecture that uses callbacks and an event loop. Modules are used to add functionality to Node.js applications, and can be installed via the NPM package manager.

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This document outlines an agenda for discussing JavaScript at the backend using Node.js. The agenda includes explaining what Node.js is, installing Node.js, writing a simple "Hello World" program, running Node.js applications, exploring core Node.js modules like the file system and HTTP modules, and handling HTTP requests. Key points are installing Node.js from its website, using the file system and HTTP modules to interact with files and create an HTTP server, and using a request handler to return different responses based on the URL. The presenter is introduced as an author who works with JavaScript, Node.js, and related technologies.

Node jsRohan Chandane

Node.js is a JavaScript runtime built on Chrome's V8 JavaScript engine. It allows JavaScript to be run on the server-side instead of in the browser. Node.js uses non-blocking I/O and event looping which makes it lightweight and efficient for data-intensive real-time applications. The Node Package Manager (npm) allows Node.js applications to install additional packages and dependencies. Express.js is a popular web application framework for Node.js that provides features for building web applications and APIs.

Introduction to Node jsAkshay Mathur

The document provides an introduction to building a simple web server in Node.js. It discusses organizing the code into modules, including a server module to start the web server, a routes module to route requests, and a request handlers module. It also covers basic concepts like using the http module to create a server, handling requests, and returning responses. The server currently returns the same "Hello World" response for all requests, and next steps involve routing requests to proper handlers to return the appropriate content based on the URL.

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Node pptTamil Selvan R S

This document provides an overview of Node.js, including common uses, a simple "Hello World" example server, how Node.js is an event-driven platform rather than just a web server, its single-threaded asynchronous architecture based on an event loop, prerequisites for programming in Node.js like understanding callbacks and closures, its module system and use of npm, challenges of asynchronous programming, common patterns and antipatterns, and difficulties of debugging and monitoring Node.js applications.

Introduction Node.jsErik van Appeldoorn

This document provides an introduction to Node.js. It discusses why JavaScript can be strange, but explains that JavaScript is relevant as the language of the web. It then discusses what Node.js is and its event-driven, non-blocking architecture. Popular Node.js applications like HTTP servers, REST APIs, and web sockets are mentioned. Examples are provided of building a simple web app with Express and Jade, a REST API with Restify, and using web sockets with Socket.io. The document also discusses using Mongoose with MongoDB for data modeling.

RESTful API In Node Js using Express Jeetendra singh

This document discusses creating REST APIs with Express, Node.js, and MySQL. It provides an overview of Express and its advantages. It then demonstrates how to set up a Node.js and MySQL environment, create an Express server, and implement API routes to GET, POST, DELETE, and PUT data from a MySQL database table. Code examples are provided to retrieve all todos, a single todo by ID, search todos by keyword, add a new todo, delete a todo, and update an existing todo.

Future of NodeJSSébastien Pertus

Node.js and How JavaScript is Changing Server Programming Tom Croucher

Node.js is a highly concurrent JavaScript server written on top of the V8 JavaScript runtime. This is awesome for a number of reasons. Firstly Node.js has re-architected some of the core module of V8 to create a server implementation that is non-blocking (similar to other event driven frameworks like Ruby’s Event Machine or Python’s Twisted). Event driven architectures are a natural fit for JavaScript developers because it’s already how the browser works. By using an event driven framework Node is not only intuitive to use but also highly scalable. Tests have shown Node instances running tens of thousands of simultaneous users. This session will explore the architectural basics of Node.js and how it’s different from blocking server implementations such as PHP, Rail or Java Servlets. We’ll explore some basic examples of creating a simple server, dealing with HTTP requests, etc. The bigger question is once we have this awesome programming environment, what do we do with it? Node already has a really vibrant collection of modules which provide a range of functionality. Demystifying what’s available is pretty important to actually getting stuff done with Node. Since Node itself is very low level, lot’s of things people expect in web servers aren’t automatically there (for example, request routing). In order to help ease people into using Node this session will look at a range of the best modules for Node.js.

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Node.js is an asynchronous and event-driven JavaScript runtime built on Google's V8 engine. It allows building scalable network applications easily and uses an event loop model with a single thread to handle non-blocking I/O. Asynchronous I/O is used to avoid blocking operations and keep the single thread available. Node.js has a large module ecosystem and is commonly used for real-time web applications and scalable backend services.

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OSCON 2011 - Node.js TutorialTom Croucher

This document provides an overview and summary of a Node.js workshop presented by Tom Hughes-Croucher. The workshop covers: 1. Why use server-side JavaScript and how Node.js enables this through its event-driven and non-blocking architecture. 2. An introduction to Node.js, including how to install Node.js and build basic HTTP servers. 3. More advanced Node.js topics like modules, events, streams, debugging, and popular frameworks like Express.js. 4. Exercises are provided to help attendees get hands-on experience building Node.js applications.

Nodejs presentationArvind Devaraj

This document provides an introduction and overview of Node.js and MongoDB. It discusses that Node.js is a JavaScript runtime built on Chrome's V8 JavaScript engine that uses an event-driven, non-blocking I/O model. It can be used for real-time applications and is well-suited for I/O-intensive applications. MongoDB is also introduced as a popular JSON-based NoSQL database that can be easily used with Node.js applications. Examples are given for connecting to MongoDB from Node.js code.

Introduction to Node.js: What, why and how?Christian Joudrey

Node.js is a JavaScript runtime built on Chrome's V8 JavaScript engine. It allows JavaScript to be used for server-side scripting and provides APIs for networking and file system operations. Node.js uses an event-driven, non-blocking I/O model that makes it lightweight and efficient, allowing a single process to handle thousands of concurrent connections. It includes a package manager and common module system. Popular frameworks like Express make it easy to build scalable web servers and applications with Node.js.

All aboard the NodeJS ExpressDavid Boyer

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Node.js Patterns for Discerning Developerscacois

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This document discusses server-side event-driven programming using Node.js. It covers how Node.js uses an event loop and asynchronous non-blocking I/O to handle many connections concurrently with high performance. Common Node.js concepts are explained like first-class functions, callbacks, and event emitters. Node.js is compared to traditional threaded programming and shown to have advantages in scalability and efficiency. Example Node.js applications and APIs are provided.

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(C)NodeJSJackson Tian

NodeJS is an open-source and cross-platform JavaScript runtime environment that allows JavaScript to be used for server-side scripting. The document discusses what NodeJS is, why it was created, how to use it, who uses it, and its use in China (CNodeJS). Key points are that NodeJS is used for building scalable network applications using non-blocking I/O and the JavaScript language, and that it has seen significant adoption in China from companies like Taobao and Sina for building web servers and real-time applications.

introduction to node.jsorkaplan

This document provides an introduction to Node.js, a framework for building scalable server-side applications with asynchronous JavaScript. It discusses what Node.js is, how it uses non-blocking I/O and events to avoid wasting CPU cycles, and how external Node modules help create a full JavaScript stack. Examples are given of using Node modules like Express for building RESTful APIs and Socket.IO for implementing real-time features like chat. Best practices, limitations, debugging techniques and references are also covered.

Node.js and RubyMichael Bleigh

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Nodejs Event Driven Concurrency for Web ApplicationsGanesh Iyer

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This document provides an overview of Node.js, including what it is, its key features, and how to test a Node.js installation. Node.js is a JavaScript runtime environment that allows building scalable network applications in a single programming language. It uses non-blocking I/O and event-driven architecture, making it suitable for data-intensive real-time applications. The document demonstrates creating an HTTP server in Node.js, using the built-in URL module, and shows how Node.js uses an asynchronous and event-driven platform. It concludes by providing a link to a demo login application built with Node.js on GitHub.

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Quantum computers can use all of the possible pathways generated by quantum decisions to solve problems that will forever remain intractable to classical compute power. As the mega players vie for quantum supremacy and Rigetti announces its $1M "quantum advantage" prize, we live in exciting times. IBM-Q and Microsoft Q# are two ways you can learn to program quantum computers so that you're ready when the quantum revolution comes. I'll demonstrate some quantum solutions to problems that will forever be out of reach of classical, including organic chemistry and large number factorisation.

Don Goodman-Wilson - Chinese food, motor scooters, and open source developmen...Codemotion

Chinese food exploded across America in the early 20th century, rapidly adapting to local tastes while also spreading like wildfire. How was it able to spread so fast? The GY6 is a family of scooter engines that has achieved near total ubiquity in Europe. It is reliable and cheap to manufacture, and it's made in factories across China. How are these factories able to remain afloat? Chinese-American food and the GY6 are both riveting studies in product-market fit, and both are the product of a distributed open source-like development model. What lessons can we learn for open source software?

Pieter Omvlee - The story behind Sketch - Codemotion Amsterdam 2019Codemotion

Dave Farley - Taking Back “Software Engineering” - Codemotion Amsterdam 2019Codemotion

Would you fly in a plane designed by a craftsman or would you prefer your aircraft to be designed by engineers? We are learning that science and empiricism works in software development, maybe now is the time to redefine what “Software Engineering” really means. Software isn't bridge-building, it is not car or aircraft development either, but then neither is Chemical Engineering. Engineering is different in different disciplines. Maybe it is time for us to begin thinking about retrieving the term "Software Engineering" maybe it is time to define what our "Engineering" discipline should be.

Joshua Hoffman - Should the CTO be Coding? - Codemotion Amsterdam 2019Codemotion

What is the job of a CTO and how does it change as a startup grows in size and scale? As a CTO, where should you spend your focus? As an engineer aspiring to be a CTO, what skills should you pursue? In this inspiring and personal talk, I describe my journey from early Red Hat engineer to CTO at Bloomon. I will share my view on what it means to be a CTO, and ultimately answer the question: Should the CTO be coding?