jquery if page has class code example

Example 1: jquery check if a class exists

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

Example 2: how to find a name of class from page in jquery

if ($('.Mandatory').length > 0) {
  //do your thing
}

Example 3: how to find a name of class from page in jquery

$('.Mandatory').each(function(){
  //do your thing
});