TOPIC: HowTo Filter the Columns of an Array (Numbers)

function filterArrNumberByCol(qMultiOpt, qArray, prevPage) {
 
    // If filter question is on a previous page, hide Q1 and check all "visible" boxes
	if(prevPage == 1) {
		$('#question'+qMultiOpt+' li[id^="javatbd"]:visible input.checkbox').attr('checked', true);
		$('#question'+qMultiOpt+'').hide();
	}
 
	// Assign classes to the answer cells
	$('#question'+qArray+' td.answer-item').each(function(i){
		var classArr = $(this).attr('class').split('answer_cell_00');
		classArr = classArr[1].split(' ');
		var ansCode = classArr[0];
		$(this).addClass('ans-'+ansCode+' filtered');
	});
 
	// Assign classes to the answer label cells
	$('#question'+qArray+' table.subquestions-list tbody tr:eq(0) td.answer-item').each(function(i){
		var classArr2 = $(this).attr('class').split(' ans-');
		var ansCode2 = classArr2[1];
		$('#question'+qArray+' table.subquestions-list thead tr:eq(0) th:eq('+i+')').addClass('ans-'+ansCode2+'');
	});
 
	// Fire the filter function on page load
	filterArr(qMultiOpt, qArray);
 
	// Listener on multi-opt checkboxes to fire the filter function
	$('#question'+qMultiOpt+' input.checkbox').click(function(){
		filterArr(qMultiOpt, qArray);
	});
 
	// On submit, clear all hidden checkboxs of array
	$('#movenextbtn, #movesubmitbtn').click(function(){
		$('#question'+qArray+' td.filtered:hidden').each(function(i){
				$('input.checkbox', this).prop('checked', false);
		});
		return true;
	});
}
 
function filterArr(qMultiOpt, qArray) {
 
	if($('#question'+qMultiOpt+' input.checkbox:checked').length < 1) {
		// Hide the array if no multi-opt options are checked
		$('#question'+qArray+'').hide();
	}
	else {
		$('#question'+qArray+'').show();
 
		// Hide all columns of array
		$('#question'+qArray+' table.subquestions-list tbody td.answer-item, #question'+qArray+' table.question thead th').hide();
 
		// Loop through multi-opt checkboxes and, if checked, show corresponding column of array
		$('#question'+qMultiOpt+' input.checkbox').each(function(i){
			if($(this).prop('checked') === true) {
				var classArr3 = $(this).attr('id').split('X'+qMultiOpt);
				var ansCode3 = classArr3[1];
				$('#question'+qArray+' .ans-'+ansCode3+'').show();
			}
		});
	}
}