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POextending AS3's Array access operators to 'wrap' out-of-bound index values
 

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    <p>I'd really like to be able to make Flash's array access syntax 'wrap' over the array's bounds.</p> <p>Lengthy explanation - </p> <pre><code>var array:Array = ['a','b','c','d','e','f']; </code></pre> <p>To keep things simple, the first index is 0, and its value is the first letter, 'a'. To get that value, we'd do this -</p> <pre><code>array[0]; // returns 'a' </code></pre> <p>As long as the index you're using to access the array is between 0 and array.length (6 in our example,) everything works fine - but if you use an index outside of those bounds, you're shut down.</p> <pre><code>array[-3]; array[9]; // both return 'undefined' </code></pre> <p>Sometimes that's a good thing - sometimes you expect that to happen, and you're fine with it. Other times, you find yourself wishing (or at least I find myself wishing) that it'd behave a bit more like this -</p> <pre><code>array[-3]; array[9]; // both return 'd' </code></pre> <p>(e.g. a photo gallery that jumps back to the beginning when you click 'next' on the last photo)</p> <p>There's a little chunk of code I use over and over for this sort of thing, but it's always to alter the index <em>before</em> passing it into the array:</p> <pre><code>var index = -3; while(index &lt; 0){index += array.length} array[index % array.length]; // returns 'd' </code></pre> <p>... and that's fine, but what I really want to do is extend the Array object itself so that it'll automatically 'wrap' index values that go out of bounds.</p> <p>TL;DR - Is index-wrapping possible by extending Flash AS3's Array object?</p>
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    1. USmatt lohkamp
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      1. USJuan Pablo Califano
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      1. USGeorge Profenza
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