//String.prototype.mblength(string) { // count_utf8mb4
Object.defineProperty(String.prototype, 'mblength', {
  get () {
		const split = this.split("\u{200D}");
		let count = 0;
		for (const s of split) {
			const num = Array.from(s.split(/[\ufe00-\ufe0f]/).join("")).length;
			count += num;
		}
		return count / split.length;
	}
}); //count_utf8get

function format(codepoints, radix, formatter = '', prefix = '') {
	els = '';
	codepoints.forEach(function(codepoint, index) {
		converted = codepoint.codePointAt(0);
		if (radix != 'dec') {
			converted = eval('ConvertBase.dec2' + radix + '(' + converted + ')');
		}
		if (formatter != '') {
			formatted = formatters[formatter](converted, (prefix ? prefix : ''));
		} else {
			formatted = converted;
		}
		els += '<code>' + formatted + '</code>'; // </code>, '
	});
	return els;
}

formatters = {
	unicode: function(code) {
		return 'U+' + code;
	},
	hex: function(code) {
		return '0x' + code;
	},
	slash: function(code, prefix = '') {
		return '\\' + prefix + code;
	},
	html: function(code, prefix = '') {
		return '&amp;#' + prefix + code + ';';
	}
}