Advanced ActionScript 3: Design Patterns

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Advanced ActionScript 3 with design patterns

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We had a lot of fun writing it and I think it turned out really well. Check it out and let me know what you think. My only concern is that when I completed the very exhaustive Chapter 10 Commands game example, I was left with a:. TypeError: Error Cannot access a property or method of a null object reference.

I found this to be very frustrating for I actually took the time thinking it would improve my skills so why not to do the long chapter, just to be shut down at the end. I cant seem to get any help anywhere. This was my last resort, please help if you can!

Actionscript 3.0 design patterns object oriented programming techniques pdf download

It sounds as though you may have inadvertently omitted a line of code or mistyped something. The error you are getting is exactly what it says it is…you have a null object for which you are trying to access a property.

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It is one of the most common errors when working with ActionScript, and it is usually among the simplest to correct. Over the years the community of software developers have questioned, theorized and debated over the root causes of failures emerging from bad application design and inappropriate architecture.

Design Patterns

The viewpoints and thoughts are varied An illustration of which is beyond the scope of this post. I may write about it in a separate post in future.

However, there are some points of agreement and universal appreciation. One such topic of agreement, is the notion of leveraging design patterns. Design patterns have existed from the time the discipline of software development was a toddler back in the 70s, when it learnt to avoid its initial mistakes.

Back then though, these patterns were not cataloged or adapted for specific areas of applicability. Now as the discipline is maturing into a teenager towards the end of the first decade of the 21st century, design patterns are entering the standard vocabulary of an average developer.

Advanced ActionScript 3 with Design Patterns

In addition, he or she could pick up one of the two design patterns books that pertains to AS3, namely:. However, at this last link in the chain the story often breaks. Its not a trivial effort to wire design patterns in conjunction with the existing framework classes. Using structural patterns with existing class heirarchies is not automatic and implementing behavioural patterns on top of the default flow is not intutive.

That chapter neither addressed all the issues not did it include details on implementing these patterns in Flex.