Event Listener trick using bracket notation

//Event Listener Trick using bracket notation:

//Standard way:--------------------------------------------------------------------

public function addEventListeners():void
{
    someObject_01.addEventListener(Event.ENTER_FRAME, someFunction_01);
    someObject_02.addEventListener(Event.ENTER_FRAME, someFunction_02);
    someObject_03.addEventListener(Event.ENTER_FRAME, someFunction_03);
}

public function removeEventListeners():void
{
    someObject_01.removeEventListener(Event.ENTER_FRAME, someFunction_01);
    someObject_02.removeEventListener(Event.ENTER_FRAME, someFunction_02);
    someObject_03.removeEventListener(Event.ENTER_FRAME, someFunction_03);
}
//---------------------------------------------------------------------------------


//Using bracket notation-----------------------------------------------------------

public function setEventListeners(add:Boolean):void
{
    var XXX:String;
    if(add ){XXX = "addEventListener"   };
    if(!add){XXX = "removeEventListener"};
    someObject_01[XXX](Event.ENTER_FRAME, someFunction_01);
    someObject_02[XXX](Event.ENTER_FRAME, someFunction_02);
    someObject_03[XXX](Event.ENTER_FRAME, someFunction_03);
}
//---------------------------------------------------------------------------------