jQuery checkboxes handling based on ids and classes with indeterminate property

checkboxes.js

jQuery(document).ready(function($){
		$(":checkbox").click(function(){
			let isChecked = $(this).prop('checked');
			let id = $(this)[0].id;
			let itemClasses =  $(this).attr('class');
			if (id != undefined && id != ""){
				$("."+id).prop('checked',isChecked);
			}
			if (!isChecked){
				if (itemClasses != undefined){
					let classList = itemClasses.split(/\s+/);
					$.each(classList, function(index, item){
						console.log(item);
						if (item != ""){
							$("#"+item).prop("indeterminate", true);
							$("#"+item).val("i");
						}
					});
				}
			}
			$(this).val(isChecked);
		});
	});