jquery check if class contains any element

1$("#EL_ID").hasClass("CLASS_NAME");

1if ($(".mydivclass").length){
2    // Do something if class exists
3} else {
4    // Do something if class does not exist
5}

1if ($(".mydivclass")[0]){
2    // Do something if class exists
3} else {
4    // Do something if class does not exist
5}

1jQuery(function ($) {
2	if ($(".className").length == 0) {
3		$(".element").removeAttr("style").hide();
4	}else{
5		$(".element").removeAttr("style").show();
6	}	
7});