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Is there any performance difference between using two separate calls to hide two elements, or would it be more/less efficient to use only 1 statement? Is there any practical difference?
$('#container1').hide();
$('#container2').hide();
vs:
$('#container1, #container2').hide();
Also, which do you think is more readable?
There is a minor performance difference in that the same delegate is being called on both elements, but this is a very, very minor memory allocation. Any extra lines of code also mean more work for the javascript interpreter and work for the browser…that’s more of a difference than anything, but still an infinitesimally small difference.
Short answer: the second one is slightly faster/uses less memory, it’s so insanely insignificant you probably couldn’t measure without looping tens of thousands of times.