jquery content repeater

app.js

$('.repeater').on('click', '.repeater-btn', function(e) {
        e.preventDefault();

        var $this = $(this),
            $repeater = $this.closest('.repeater').find('[data-repeatable]'),
            count = $repeater.length,
            $clone = $repeater.first().clone();

        $clone.find('[id]').each(function() {
            this.id = this.id + '_' + count;
        });

        $clone.find('[name]').each(function() {
            this.name = this.name + '[' + count + ']';
        });

        $clone.find('label').each(function() {
            var $this = $(this);
            $this.attr('for', $this.attr('for') + '_' + count);
        });

        $clone.insertBefore($this);
    });