Full-Stack JavaScript with Node.js

Full-Stack JavaScriptFull-Stack JavaScript
An introduction to Node.jsAn introduction to Node.js

When we speak aboutWhen we speak about
JavaScript …JavaScript …

JavaScript isJavaScript is StrangeStrange
console.log(1 == true); // true
console.log(1 === true); // false
console.log("0" == false); // true
console.log("abc" == "a" + "b" + "c"); // true
console.log(null == undefined); // true
console.log(30 - "7"); // 23
console.log("30" + 7); // 307

JavaScript is even moreJavaScript is even more
StrangeStrange
function rectangle(x,y) {
this.x = x;
this.y = y;
}
rectangle.prototype.area = function() {
return this.x * this.y;
}
var twoByThree = new rectangle(2,3);
console.log(twoByThree.area());

But… JavaScript is relevant!But… JavaScript is relevant!

What is Node.jsWhat is Node.js

““Node.js is a platform built on Chrome's JavaScriptNode.js is a platform built on Chrome's JavaScript
runtime for easily building fast, scalable networkruntime for easily building fast, scalable network
applications. Node.js uses an event-driven, non-applications. Node.js uses an event-driven, non-
blocking I/O model that makes it lightweight andblocking I/O model that makes it lightweight and
efficient, perfect for data-intensive real-timeefficient, perfect for data-intensive real-time
applications that run across distributed devices.”applications that run across distributed devices.”
- from nodejs.org

Node.js event loopNode.js event loop

Non-blocking I/ONon-blocking I/O
I/O block execution until finished
I/O doesn’t block execution
var data = $.post('/resource.json');
console.log(data);
$.post('/resource.json', function (data) {
console.log(data);
});
// script execution continues

Now we have an incrediblyNow we have an incredibly
fast platformfast platform

Overview of the layers thatOverview of the layers that
make up a Node applicationmake up a Node application
V8 thread pool
(libeio)
event loop
(libev)
crypto
(OpenSSL)
DNS
(c-ares)
Node core
querystring, http, socket, file system,
low-level HTTP parser, low-level TCP server
Community modules
node-formidable, node-cgi, mongoose, socket.io,
express, connect, database drivers, middleware, routing,
etc…
Application logic
http.createServer(), app.use(), route handlers,
directory structures, business algorithms

A simple file serverA simple file server
var http = require("http");
var server = http.createServer(function(req, res) {
res.writeHead(200, {'Content-Type': 'text/plain'});
res.end('Hello Worldn')
});
server.listen(3000);
console.log('Server running at http://localhost:3000/');

Node Package ManagerNode Package Manager
(NPM)(NPM)
• www.npmjs.org
• 60.000+ modules
• package.json file (npm init)
• npm install <module.name> --save

Popular Node.js modulesPopular Node.js modules
 Express - Express.js, a simple web
development framework for Node.js, and the
de-facto standard for the majority of Node.js
applications out there today.
 connect - Connect is an extensible HTTP server
framework for Node.js, providing a collection of
high performance middleware components.
 socket.io - Server-side component of the two
most common websockets components out
there today.

Local modulesLocal modules
exports.world = function () {
console.log("Hello World");
};
var hello = require("./hello");
hello.world();

Node.js is Node.js is notnot a silver-bullet new platform that will a silver-bullet new platform that will
dominate the web development world. Instead, it’s adominate the web development world. Instead, it’s a
platform that fills a particular need.platform that fills a particular need.

When to NOT use Node.jsWhen to NOT use Node.js
• When you are doing heavy and CPU intensive
calculations on server side, because event-loops are
CPU hungry.
• Node.js with a relational DB behind. Relational DB
tools for Node.js are still in their early stages.

When to use Node.jsWhen to use Node.js
• Node.js is good for creating streaming based real-
time services, web chat applications, static file
servers etc.
• If you need high level concurrency and not worried
about CPU-cycles.
• Node.js with Express.js can also be used to create
classic web applications on the server-side.

Suddenly, every startup on Earth could reuseSuddenly, every startup on Earth could reuse
developers (i.e., resources) on both the client- anddevelopers (i.e., resources) on both the client- and
server-side, solving the "Python Guru Needed" job postserver-side, solving the "Python Guru Needed" job post
problem.problem.

Full-Stack JavaScriptFull-Stack JavaScript
Angular.js
Node.js
Grunt
Mocha
Jasmine.js

ResourcesResources
• Source Code
https://github.com/lehmamic/fullstack-javascript
• Node.js in Action

Full-Stack JavaScript with Node.js

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