A blog about design, code and some other stuff

Many programming languages and environments require a Main Class, Main function or Main file as an entry-point to the program, it’s where the execution starts and also usually where you have access to command arguments. JavaScript on the browser isn’t one of those environments tho, and I think it is one of the reasons why many applications become a real maintenance nightmare. I believe that the “Main File/Function/Class” approach can help a lot to increase extensibility/maintainability and favor a good structure even for languages that doesn’t require this practice.

Many back-end frameworks started to adopt this technique over the past years, most of them have some sort of URL redirect that points to a “index” file or a router that decides which actions should be executed and which files should be loaded instead of having a single file for each page or section. This kind of abstraction increases flexibility a lot since you can just keep adding new pages/sections/features without having to care about the code structure, it also reduce code duplication since you don’t need to create a new file for each new page…

Flash projects have a Main Class which is the entry-point for the application and also works as the root node where all the child elements are attached (similar to the body element of an HTML file) and it helps you keep the code flow organized since you are sure that your Main Class constructor is executed before any other code, programs get easier to understand since it follows a logic order.
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I’ve just released a new open source project called JS-Signals. It’s an event/message system similar to pub/sub and DOM2 Events but that doesn’t rely on strings to broadcast/subscribe to events, it has also some extra features that usually aren’t available on the other systems.

JS-Signals was heavily inspired by Robert Penner’s AS3-Signals but it is NOT a direct port, which means it has a different implementation and features. I’ve also stolen borrowed a few ideas from Joa Ebert fork .

Make sure you read the comparison between the different event systems and the usage examples.

Download it and get more info at http://millermedeiros.github.com/js-signals/.

Ideas and contributors are welcome!

I’ve been doing a lot of JavaScript development lately and one thing that always bothered me is that most of the people misunderstand the plugin concept and uses it on the wrong way. In my opinion, the main reason is because JavaScript frameworks/libraries like jQuery, Mootools, Prototype.js and blog/CMS systems like WordPress, Joomla, Drupal encourages plugin development… – Let’s start with the basics…

What is a plug-in?

In computing, a plug-in is a set of software components that adds specific capabilities to a larger software application. If supported, plug-ins enable customizing the functionality of an application. For example, plug-ins are commonly used in web browsers to play video, scan for viruses, and display new file types. (source: Wikipedia)

What is a component?

A component in the Unified Modeling Language “represents a modular part of a system, that encapsulates its content and whose manifestation is replaceable within its environment. A component defines its behavior in terms of provided and required interfaces” (source: Wikipedia)

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I’ve been doing some PHP lately (and liking a lot) and one of the cool features of PHP5 comparing to Actionscript3 is that you can have private constructors, which means that it’s really easy to create “real static classes” and singletons without hacks!
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