javascript_practice/hw05/12_HTML_optional_fields.js

let persons = [
	{
		name: 'Sergey',
		surname: 'Honcharenko',
		age: 28,
		isMarried: false,
	},
	{
		name: 'Andrew',
		surname: 'Klymchuk',
		middleName: 'Anatoliyovych',
		haveAJob: true,
	},
	{
		name: 'Alexander',
		surname: 'Slobodian',
		sex: 'male',
		hasAPet: false,
	}
];

let str = "<table>";
for (let key in persons) {
	str += "<tr>";
	for (let value in persons[key]) {
		str += `<td>${persons[key][value]}</td>`;
	}
	str += "</tr>";
}
str += "</table>";

document.write(str);