Learning Node by Shelley Powers

By Shelley Powers

Take your net improvement abilities from browser to server with Node—and how to write quickly, hugely scalable community functions in this JavaScript-based platform. With this hands-on advisor, you’ll quick grasp Node’s middle basics, achieve adventure with numerous integrated and contributed modules, and examine the diversities and parallels among consumer- and server-side programming.

Get in control on Node’s event-driven, asynchronous I/O version for constructing data-intensive purposes which are usually accessed yet computationally uncomplicated. If you’re cozy operating with JavaScript, this publication offers quite a few programming and deployment examples that will help you make the most of server-side improvement with Node.
* discover Node’s new angle to asynchronous improvement
* construct pattern Node purposes with the explicit framework and fasten middleware
* Use NoSQL ideas equivalent to Redis and MongoDB—and discover Node’s relational database modules
* paintings with PDF records, serve HTML5 media, and create snap shots with Canvas
* manage bidirectional conversation among browser and server with WebSockets
* examine in-depth practices for debugging and checking out your functions
* install Node functions within the cloud or by yourself procedure

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All but the last example demonstrated in this section are using Unix commands. You can try running the applications in a Windows Command window, or even Web Matrix, but they won't do a bit of good. The same holds true for the example that works in Windows—it won't work in Unix. spawn There are four different techniques you can use to create a child process. The most utilized one is invoked using the spawn method. It launches a command in a new process, passing in any arguments. In the following, a child process is created to call the pwd command to print the current directory.

Cache object contains a cached version of all loaded modules. When you try to load the module again, in the same context, it's loaded from the cache. If you want to force a new load, delete the item from the cache. js'); This code forces a reload of the module the next time a require is called on it. External Modules and the Node Package Manager Much of the rich functionality associated with Node comes in via third-party modules. There are router modules, modules for working with relational or document database systems, template modules, testing modules, and even modules for payment gateways.

I used PuTTY as a telnet client to access this TCP enabled version of REPL. to a point. clear, first, the formatting is off, and when I tried to use the underscore to reference the last expression, Node didn't know what I was talking about, as shown in Figure 2-1. Figure 2-1. PuTTY and REPL via TCP don't exactly like each other I also tried with the Windows 7 telnet client, and the response was even worse. However, using my Linux telnet client worked without a hitch. The problem is, as is expected, telnet client settings.

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