It’s very nice in AS3 to simply state the name of a function and get a Function variable back, regardless of whether or not it is a method, static method, dynamic function, or plain function in a package. Most other languages do not allow this level of convenience. Java doesn’t allow it at all and C++ and AS2 require fanciness in order to pass the this pointer. However, when you want a Function for the constructor of a class, you get a Class variable back. This article will show you a way to get a Function variable that will create an instance of a class when called.
Archive for category AS3
Everybody knows about Math.random(), and for good reason. It’s pretty much the way to get random numbers in AS3, AS2, and JavaScript other than bizarre alternatives like AS3’s BitmapData.noise(). However, it has one critical problem that arises when you want to repeat a certain test or prevent game cheaters from exploiting the randomizer until they get an “easy” setup or desirable outcome. This problem is the lack of repeatability.
The Flash API provides a very nice set of XML classes along with syntax sugar in its E4X implementation. You can use this to not only read XML that you download, but also to write out XML that you upload. Unfortunately, it turns out that this is horrifyingly slow. Today we’ll do a little experiment to exemplify this.
Today’s article is in response to a comment left about my article on try/catch slowdowns. The second time around I will provide an example that is hopefully more “real world” than the last article provided.
Try/catch blocks are certainly a nice feature to have. They allow you to catch errors that are beyond your control and handle them in a nice manner. They also allow you to throw your own errors and handle them in the same way. This would all be great if it weren’t for the fact that they are tremendously slow. Read on for some surprising test results.
There are other test harnesses out there, but today I thought I’d share one of my own.
As a followup to last week’s article on curry functions, today’s is about the reverse of currying.
AS3 gives you a good number of potential ways you can loop over collections. When Flash Player 10 first came out, I went ahead and tested out the new Vector class in a variety of ways. One of them was to pit it against the collections available in Flash Player 9: Array, Object, Dictionary, ByteArray, and even BitmapData. Below I’ll show you my test and discuss its results.
Math.ceil() is a common, mundane function that you likely call all the time. I know I do. If performance gets to be important and you have a Math.ceil() in some inner loop or frequently called function, consider inlining it. Below I’ll show you how and provide a test app showing you just how much CPU time you’ll save.
Regular expressions are downright handy for a variety of string processing tasks. They are so handy that they are built straight in to the language in the form of the /regexpgoeshere/ syntax. Well, usually…