javascript - Searching the DOM on click events -

say have following code:

$('.some-class a').click(function() {     // }); 

will jquery search dom each time .some-class a clicked? or dom searched once? i'm wondering if improve performance if make $('.some-class a') variable , change to:

var $someclass = $('.some-class a'); $someclass.click(function() {     // }); 

in case :

$('.some-class a').click(function() {     // }); 

this instruction executed once : jquery search dom once, find requested elements , attach click events them. end.

in case :

function hidestuff(){     $('.some-class a').hide() } 

jquery have search dom every time function called. in order avoid that, store objects in variable (it's called caching) :

var $elems = $('.some-class a')  function hidestuff(){     $elems.hide() } 

every time hidestuff() function called, jquery won't have search dom, it's got elements stored in memory, it's faster.