// 3 persons------------------------------------------------------------------------------------------------------------------------------------//

// let a = {
//   name: "Alexandra",
//   surname: "Olefirenko",

// };

// let b = {
//   name: "Platon",
//   surname: "Plokhenko",

// };

// let c = {
//   name: "Sofia",
//   surname: "Sternenko",

// };

// different fields---------------------------------------------------------------------------------------------------------------------------------------------------;

// let a = {
//   name: "Alexandra",
//   surname: "Olefirenko",
//   sex: "female",
//   age: 21,
// };

// let b = {
//   name: "Platon",
//   surname: "Plokhenko",
//   education: "Bachelor degree",
//   age: 18,
// };

// let c = {
//   name: "Sofia",
//   surname: "Sternenko",
//   fathername: "Vyktoryvna",
//   age: 27,
// };

// fields check---------------------------------------------------------------------------------------------------------------------------------------------------;

// let a = {
//   name: "Alexandra",
//   surname: "Olefirenko",
//   sex: "female",
//   age: 21,
// };

// let b = {
//   name: "Platon",
//   surname: "Plokhenko",
//   education: "Bachelor degree",
//   age: 18,
// };

// let c = {
//   name: "Sofia",
//   surname: "Sternenko",
//   fathername: "Vyktoryvna",
//   age: 27,
// };

// array of persons---------------------------------------------------------------------------------------------------------------------------------------------------;

let persons = [
  (a = {
    name: "Alexandra",
    surname: "Olefirenko",
    sex: "F",
    age: 21,
  }),
  (b = {
    name: "Platon",
    surname: "Plokhenko",
    sex: "M",
    age: 18,
    education: "Bachelor degree",
  }),
  (c = {
    name: "Sofia",
    surname: "Sternenko",
    sex: "F",
    age: 27,
    region: "Kyiv",
    phoneNumber: "0731232323",
  }),
];

// loop of persons-----------------------------------------------------------------------------------------------------------------------------------------------------------;

for (i = 0; i < persons.length; i++) {
  console.log(persons[i]);
}

// loop of name and surname---------------------------------------------------------------------------------------------------------------------------------------------------;

for (let i = 0; i < persons.length; i++) {
  if (
    typeof persons[i].name === "string" &&
    typeof persons[i].surname === "string"
  ) {
    for (key in persons[i]) {
    }
    console.log(
      "name " +
        " " +
        persons[i].name +
        " " +
        "surname " +
        " " +
        persons[i].surname
    );
  } else {
    alert("error");
  }
}

// loop of loop of values---------------------------------------------------------------------------------------------------------------------------------------------------;

// fullName---------------------------------------------------------------------------------------------------------------------------------------------------;

// for (var i = 0; i < persons.length; i++) {
//   for (var key in persons[i]) {
//     persons[i].fullName = persons[i].fullName =
//       persons[i].name + " " + persons[i].surname;
//   }
// }
// serialize---------------------------------------------------------------------------------------------------------------------------------------------------;

// JSON.stringify(persons);

// deserialize---------------------------------------------------------------------------------------------------------------------------------------------------;

// JSON.parse('{"name: Taras, surname: Shevchenko"}');

// HTML----------------------------------------------------------------------------------------------------------------------------------------------------------;
document.write("</table>");
document.write(
  '<table style = "border-collapse: collapse", "border: 1px solid black; ">'
);
document.write("<tr>");

for (key in persons[0]) {
  document.write('<th style = "border: 1px solid black;">' + key + "</th>");
}
document.write("</tr>");
for (let i = 0; i < persons.length; i++) {
  document.write("<tr>");
  for (value in persons[i]) {
    document.write(
      '<td style = "border: 1px solid black;">' + persons[i][value] + "</td>"
    );
  }
  document.write("</tr>");
}
document.write("</table>");

// HTML optional fields---------------------------------------------------------------------------------------------------------------------------------------------------;
// HTML tr color---------------------------------------------------------------------------------------------------------------------------------------------------;

document.write("<table>");
document.write('<tr style="color: red;">');

for (key in persons[0]) {
  document.write("<th>" + key + "</th>");
}
document.write("</tr>");
for (i = 0; i < persons.length; i++) {
  document.write("<tr >");
  for (value in persons[i]) {
    document.write("<td>" + persons[i][value] + "</td>");
  }
  document.write("</tr>");
}
document.write("</table>");

// HTML th optional---------------------------------------------------------------------------------------------------------------------------------------------------;
// Задание на синий пояс.---------------------------------------------------------------------------------------------------------------------------------------------------;
// destruct array---------------------------------------------------------------------------------------------------------------------------------------------------;

// destruct string---------------------------------------------------------------------------------------------------------------------------------------------------;
let arr1 = [1, "abc"];
// destruct 2---------------------------------------------------------------------------------------------------------------------------------------------------;
let obj = {
  name: "Ivan",
  surname: "Petrov",
  children: [{ name: "Maria" }, { name: "Nikolay" }],
};

// destruct 3---------------------------------------------------------------------------------------------------------------------------------------------------;
let arr = [1, 2, 3, 4, 5, 6, 7, 10];
// Задание на черный пояс---------------------------------------------------------------------------------------------------------------------------------------------------;