Question

Quick question; should I use removeChild() or removeEventListener() first?

Also, if I set an object to null, do I still need to remove event listeners from that object?

Answer 1

“Remove event listeners before removeChild.”

Whether doing the other way will throw an error or not, totally depends on the event you are listening to & the objects you are trying to access after the event fires.

But it always a good practice to remove event listeners as fast as you can.

For example : If you require the click of a button once & you seem to disable the button after click, It doesn’t make sense to keep the listener running.

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And Yes you do need to manually remove all event listeners. But you can also use weak event listeners:

addEventListener(MouseEvent.CLICK, clicked, false, 0, true);

Which hints the garbage collector to remove the listener when object is set to null.