jquery - Rails 4 - Javascript - trouble with .not() -


can tell me wrong in javascript ?

it's supposed show alert "already opened" if there's plus (or) 2 pp div class "open". 

if ($('pp').not('.closed')>=2) {                   window.alert('already opened');                   }

jquery's not function return jquery object, not integer.

i can't validate if rest of logic working if want number of dom elements matches jquery element, should using length value:

if ($('pp').not('.closed').length>=2) {   window.alert('already opened'); }

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