Detect when a variable changes in flash

Here is a nifty little script to keep track of variables. Basically you declare a variable, create a callback to be fired when the variable changes, and then you "watch" it.

// Declare your variable (can be any kind)
var myVar:Number = 0;

// Here's your callback that will be fired every time you change your var
myVarChangeCallBack = function (varName, oldval, newval):String {
	trace ('Variable "' + varName + '" has changed from ' + oldval + ' to ' + newval);
	return newval;
};

// Watch your var for changes
watch("myVar", myVarChangeCallBack);


// Some code to try this out
_root.onMouseDown = function () {
	myVar++;
}

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