CoffeeScript in Action

Chapter 1. The road to CoffeeScript
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Who knew JavaScript would end up being a compelling language for writing server-side applications? Yet, due to its sheer reach, performance, and other characteristicsmentioned previously, Node has gained a lot of traction. JavaScript is only one pieceof the puzzle though; the way Node uses JavaScript is even more compelling.

Using CoffeeScript

It brings JavaScript to the server in much the same way a browser brings JavaScript to the client. Ajax request made for resource. Finally, Ajax response for console. Another Ajax response comes back. User clicks; onclick event handled. Figure 1. Because the browser is single-threaded, if this request took ms to return, any other events happening on that page would wait until then beforeexecution.

You can imagine the poor user experience if an animation was paused orthe user was trying to interact with the page somehow. This enables the browser to be responsive to the client and tohandle a lot of interactivity on the page. Asynchronous and evented: the server For many applications this model is fine and is easy to follow. A commonimplementation is to use one thread per connection and set up a thread pool forthose connections.

Core Features

You can think of threads as computational workspaces in whichthe processor works on one task. In many cases, a thread is contained inside a processand maintains its own working memory. Each thread handles one or more server con-nections. Also, when a large number of threads is needed to handlemany concurrent server connections, threading can tax operating system resources.

Because of these design choices, NGINX is often able tohandle more requests and connected clients, making it a more responsive solution. It allows the server to be lightweighton what are typically the slowest operations a server performs.

It stands for data-intensive real-time applications. It allows a server to hold a number of connections open while handling many requests and keep- ing a small memory footprint. Real-time applications are a new use case of the web. Many web applications now provide information virtually instantly, implementing things like online whiteboard collaboration, real-time pinpointing of approaching public transit buses, and multi- player games. These new types of web applications, however, call for a platform that can respond almost instantly to a large number of concurrent users.

The site allows in-browser use of other browsers.

Other Titles by Professor Patrick Lee

This is extremely useful to front-end web developers because it frees them from hav- ing to install numerous browsers and operating systems solely for testing. Browserling www. DIRTy applications 9Figure 1. This is illustrated in figure 1.

Browserling and Testling are good examples of DIRTy applications, and the infra- structure for building scalable network applications like them is at play when you sit down to write your first Node application. The most common host environment for JavaScript—the one most developers are used to—is the browser, which is event-driven and asynchronous. Third-party modules build upon these blocks to offer greater abstractions for common problems. Platform vs.

Accelerated JavaScript Development, Second Edition

IO is covered more deeply in chapter When starting the application, a user is automatically assigned a guest name, but they can change it by entering a command, as shown in figure 2. Language junkies will especially appreciate how this book takes idioms from other programming languages and shows how CoffeeScript makes them available in JavaScript. Comparison Timeline History. The spread of Node.

DIRTy by default When all the data is read, an anonymous function is called a. The process loops behind the scenes, able to handle any other operations that may come its way until the data is ready. All the evented and async benefits we talked about earlier are in play automatically. This latter action is illustrated in figure 1. Event loop 1. File request made for resource. Finally, file data forfs. An event is triggered.

Node makes it very simple to create different types of servers. In Node, the server and the application are the same. This event model is akin to listening to an onclick event in the browser. A click could happen at any point, so you set up a func- tion to perform some logic to handle that.

Here, Node provides a function that responds whenever a request happens. You can think of streams as being like arrays, but instead of having data distributed over space, streams can be thought of as data distributed over time.

Action Cable

By bringing data in chunk by chunk, the developer is given the ability to handle that data as it comes in instead of waiting for it all to arrive before acting. A chunk can vary in size, depending on the www. Summary 13type of data. Node also provides writable streams that you can write chunks of data to.

One ofthose is the response res object when a request happens on an HTTP server. Readable and writable streams can be connected to make pipes, much like you cando with the pipe operator in shell scripting.

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The event loop is able to handle otherevents while the data is being streamed. It just helps you tackle certain prob- lems and opens new possibilities. One of the interesting things about Node is that it brings people from all aspects of the system together. Many come to Node as JavaScript client-side programmers; others are server-side programmers; and others are systems-level programmers. Wherever you fit, we hope you have an understanding of where Node may fit in your stack.


CoffeeScript in Action is a tutorial that teaches you how, where, and why to use CoffeeScript. It begins by quickly exposing you to CoffeeScript's new, but. SummaryCoffeeScript in Action is a tutorial that teaches you how, where, and why to use CoffeeScript. It begins by quickly exposing you to CoffeeScript's new, .

This chapter assumes you have experience with web application development, have a basic understanding of HTTP, and are familiar with jQuery. Application overview 15 Figure 2. A message, once entered, is sent to all other users in the same chat room. When starting the application, a user is automatically assigned a guest name, but they can change it by entering a command, as shown in figure 2. Figure 2.

Chapter 3. First-class functions

When joining or creating a room, the new room name will be shown in the horizontal bar at the top of the chat application. The room will also be included in the list of available rooms to the right of the chat message area. After the user changes to a new room, the system will confirm the change, as shown in figure 2. While the functionality of this application is deliberately bare-bones, it showcases important components and fundamental techniques needed to create a real-time web Figure 2.

Application requirements and initial setup 17 application. The application shows how Node can simultaneously serve conventional HTTP data like static files and real-time data chat messages. It also shows how Node applications are organized and how dependencies are managed. To handle chat-related messaging, you could poll the server with Ajax.

Opening and closing connections takes time, and the size of the data transfer is larger because HTTP headers are sent on every request. IO handles fallback functionality transparently, requiring no additional code or configuration. IO is covered more deeply in chapter Quick Upload. Featured Examples. Creation Tutorial. Video Tutorial. Quick Upload Explore. Case Studies. Like this book?

Using CoffeeScript in a Sails app

You can publish your book online for free in a few minutes! View in Fullscreen Report. Read the Text Version. No Text Content! Download PDF. Create your own flipbook. To do that, bind to the ajax:success event. On failure, use ajax:error. Check it out:. As of Rails 5. For information about the previously used jquery-ujs in Rails 5 and earlier, read the jquery-ujs wiki. It has a :remote option you can use like this:. Here's an example. Let's assume that we have a list of articles that can be deleted with just one click.

We would generate some HTML like this:.