Forums → Programming Forum → (isAlive == false) vs (root == null)

As you can see by the img below, there are a few class files associated with then main document.


img link

Without looking at the code, lets assume that every class has listeners. If you removeChild without removing the listeners you get this annoying error message.

TypeError: Error #1009: Cannot access a property or method of a null object reference.

Two nifty ways of getting rid of this message

addEventListener(Event.ENTER_FRAME, loop);
function loop(event):void
{
if(isAlive == false)
{
removeEventListener(Event.ENTER_FRAME, loop);
//remove other listeners
}
else
{
//loop function
}
}

OR

addEventListener(Event.ENTER_FRAME, loop);
function loop(event):void
{
if(root == null)
{
removeEventListener(Event.ENTER_FRAME, loop);
//remove other listeners
}
else
{
//loop function
}
}

Whats your favorite method?

Is there a different method?

What do you think are the pro's and con's of each method