Flex Optimization Tip: Evaluate Your Setter Parameter

Flash Builder makes it easy to generate getters and setters from a variable definition. Just select the variable, right-click and choose Source > Generate getters/setters.

The generated code is simple; the getter returns the value and the setter sets the value:

private var _myData:String;

public function get myData():String {
    return _myData;
}

public function set myData(value:String):void {
   _myData = value;
}

Oftentimes in Flex, however, changing a variable is a trigger that causes other code to run or update. But why would you want this extra processing to occur if the value that is being assigned hasn’t changed?
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