Find String that starts with in array AS3

Question

I want to prevent users from using webcam emulators, I have done that in AS2 by using senocular's function, but I can't make it work in AS3,so, here is the old version by senocular , and I would like to do the same in AS3, tried using indexOf but doesn't work, I need to find at least the first 4 characters of the string and compare them to the item inside the array in AS3!

String.prototype.startsWith = function(str){ return !this.indexOf(str); }

here is what I want to do:

var bannedDevices = new Array("FakeCam","SplitCam","Phillips Capture Card 7xx","VLC"); var myDeviceName = "SplitCam v1.5"; //"Splitcam" in bannedDevices should trigger this; if (myDeviceName.indexOf(bannedDevices)){ trace("banned device"); }

Thanks for the help !

Kodiak · Accepted Answer · 2011-04-15 18:06:30Z

OK, I leave my previous answer for history. Now that i've understood what you want:

public function FlashTest() { var bannedDevices:Array = new Array("FakeCam","SplitCam","Phillips Capture Card 7xx","VLC"); var myDeviceName:String = "SplitCam v1.5"; //"Splitcam" in bannedDevices should trigger this; trace(startsWith(myDeviceName, bannedDevices, 4)); } /** * @returns An array of strings in pHayStack beginning with pLength first characters of pNeedle */ private function startsWith(pNeedle:String, pHayStack:Array, pLength:uint):Array { var result:Array = []; for each (var hay:String in pHayStack) { if (hay.match("^"+pNeedle.substr(0,pLength))) { result.push(hay); } } return result; }

Kodiak · Accepted Answer · 2011-04-15 16:18:16Z

Your need is not very clear... Here is a function which returns every string from an array that starts with the given string.

public function FlashTest() { var hayStack:Array = ["not this one", "still not this one", "ok this one is good", "a trap ok", "okgood too"]; trace(startsWith("ok", hayStack)); } /** * @returns An array of strings in pHayStack beginning with the given string */ private function startsWith(pNeedle:String, pHayStack:Array):Array { var result:Array = []; for each (var hay:String in pHayStack) { if (hay.match("^"+pNeedle)) { result.push(hay); } } return result; }

Hello Kodiak, thanks for the reply, but it does not work as I need it to, if i add something to "ok" like: "ok v2.4" then it won't trace anything.
You need to define what you need more precisely, here my function returns the strings which starts with EXACTLY the given param...

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