Get elements that begin with a common class prefix, group them accordingly, and equalize their heights to their max height

equalize.js

var cousins = [];

// Find all elements that begin with class and return just that matching class
$('[class^=equalize-').each(function(index, el, array) {
	var group = $(el).attr('class').match(/\bequalize-[\S]*/);
	if ( group.length ) {
		cousins.push( group[0] );
	}
});

// Make list of matched element classes unique
cousins = cousins.filter(onlyUnique);

// Equalize elements
cousins.forEach(function(groupName){
	equalize(groupName);
	$(window).on('resize', function(){
		equalize(groupName);
	});
});

function equalize(groupName) {
	var maxHeight = 0;
	$('.' + groupName).each(function(){
		if ($(this).height() > maxHeight) { maxHeight = $(this).height(); }
	});
}

function onlyUnique(value, index, self) { 
    return self.indexOf(value) === index;
}