JavaScript style for optional callbacks

Question

I have some functions which occasionally (not always) will receive a callback and run it. Is checking if the callback is defined/function a good style or is there a better w

Answer 1

Simply do

if (callback) callback();

I prefer to call the callback if supplied, no matter what type it is. Don't let it fail silently, so the implementor knows he passed in an incorrect argument and can fix it.