Posts Tagged variable

Should You Bother Giving Variables a Type?

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Many modern strongly-typed languages have introduced a way for you to not have to type a variable’s type. In C#, you can use var instead of the actual type. In C++, you use auto. AS3 has a similar feature with it’s “untyped” type: *. In those other languages, var and auto are syntax sugar that the compiler replaces with the actual type. Will the AS3 compiler and/or Flash Player do the same for us? Today’s article finds out if it’s safe to skip the type and just use *.

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Making describeTypeJSON 50x Faster than describeType

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The hidden describeTypeJSON function is faster than the XML-based describeType function by default, but we can make it even faster. Today’s article describe just how this is done and achieves a nearly 10x speedup!

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Function Performance Update

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Above all others, there is one article I refer back to most: 2009’s Function Performance. It was updated for Flash Player 10.1 and 10.2, but not 10.3, 11.0, 11.1, or 11.2. Today I’m updating this article for Flash Player 11.2, adding some missing function types, and including a set of graphs to make for the ultimate function performance reference.

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Why Static Is Slow

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Using static variables and functions is slow. That was the conclusion of the previous article on statics, but the subject is actually more nuanced than that. Today we’ll explore static more in-depth and find out just why it is so slow.

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Variable Ordering

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I recently perused the AVM2 bytecode overview that Adobe provides and found something strange: they have special instructions for the first few local variables. Getting the first local variables is done by getlocal0, getlocal1, getlocal2, getlocal3, but then a generalized getlocal is used for local variables thereafter. This brought me to think about the performance implications of these specialized instructions. After all, why have them when you already have a generalized one? Read on to see the performance differences and if you can get any speed boost from rearranging your local variables.

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