In jQuery, how can I tell if the current object is hidden or not

$('myObject').show();

if ($('myObject').css('display') == 'none') {
  $('myObject').show();
}

if ($('#something').is(':hidden')) { }

if ($('#something').is(':visible')) { }

$('#something:hidden').show();
$('#something:visible').hide();

var isVisible = $('myObject').is(':visible');
 var isHidden = $('myObject').is(':hidden');