Increment in WP loop

loop.js

        (function ($) {
            var i = 1;
            $("input[name=your-name], input[name=your-phone], input[name=your-email], textarea[name=cover-letter], input[name=file-attachment]").each(function () {
                i++;
                var curParentName = $(this).parents("form").attr("name");
                var inputName = curParentName[curParentName.length-1];
                console.log(inputName);
                $(this).attr("name", $(this).attr("name")+inputName);
            })
        })(jQuery);