Question

It says on here (http://api.jquery.com/first-selector) that
” To achieve the best performance when using :first to select elements, first select the elements using a pure CSS selector, then use .filter(“:first”) “

Can someone pls give an example of this?

Answer 1

$('.elements').filter(':first'); 

or:

$('.elements').first();     

or:

$('.elements').eq(0); 

More efficient than:

$('.elements:first');

This is the case with other jQuery selectors like :has versus has method.