// 3 persons///////////////////////////////
var a = {
   name: "Ivan",
   surname: "Ivanov",
}

var b = {
   name: "Petr",
   surname: "Petrov",
}

var c = {
   name: "Stepan",
   surname: "Stepanov",
}


// different fields////////////////////////
var a = {
   name: "Ivan",
   surname: "Ivanov",
   sex: "male",
}

var b = {
   name: "Petr",
   surname: "Petrov",
   fathername: "Petrovich",
}

var c = {
   name: "Stepan",
   surname: "Stepanov",
   age: 33,
}



// fields check////////////////////////////
var a = {
   name: "Ivan",
   surname: "Ivanov",
   sex: "male",

}
var b = {
   name: "Petr",
   surname: "Petrov",
   fathername: "Petrovich",
}
var c = {
   name: "Stepan",
   surname: "Stepanov",
   age: 33,
}
if ('sex' in a) {
   alert("found word in a!")
}
if ('fathername' in b) {
   alert("found word in b!")
}
if (typeof { age: 33 } === 'object') { alert("found in c!") }



// array of persons////////////////////////
var a = {
   name: "Ivan",
   surname: "Ivanov",
   sex: "male",

}
var b = {
   name: "Petr",
   surname: "Petrov",
   fathername: "Petrovich",
}
var c = {
   name: "Stepan",
   surname: "Stepanov",
   age: 33,
}
var persons = []
persons.push(a, b, c, {
   name: "Vasya", surname: "Vasiliev", fathername: "Vasilievich"
})
console.log(persons)



// loop of persons//////////////////////////
var a = {
   name: "Ivan",
   surname: "Ivanov",
   sex: "male",

}
var b = {
   name: "Petr",
   surname: "Petrov",
   fathername: "Petrovich",
}
var c = {
   name: "Stepan",
   surname: "Stepanov",
   age: 33,
}
var persons = []
persons.push(a, b, c, {
   name: "Vasya", surname: "Vasiliev", fathername: "Vasilievich"
})
for (let i = 0; i < persons.length; i++) {
   console.log(persons[i]);
}



// loop of name and surname//////////////////
var a = {
   name: "Ivan",
   surname: "Ivanov",
   sex: "male",

}
var b = {
   name: "Petr",
   surname: "Petrov",
   fathername: "Petrovich",
}
var c = {
   name: "Stepan",
   surname: "Stepanov",
   age: 33,
}
var persons = []
persons.push(a, b, c, {
   name: "Vasya", surname: "Vasiliev", fathername: "Vasilievich"
})
for (let i = 0; i < persons.length; i++) {
   console.log(persons[i].name, persons[i].surname);
}


// loop of loop of values////////////////////
var a = {
   name: "Ivan",
   surname: "Ivanov",
   sex: "male",

}
var b = {
   name: "Petr",
   surname: "Petrov",
   fathername: "Petrovich",
}
var c = {
   name: "Stepan",
   surname: "Stepanov",
   age: 33,
}
var persons = []
persons.push(a, b, c, {
   name: "Vasya", surname: "Vasiliev", fathername: "Vasilievich"
})
for (let i = 0; i < persons.length; i++) {
   for (let values in persons[i]) { console.log(persons[i][values]); }
}


// fullName///////////////////////////////////
var a = {
   name: "Ivan",
   surname: "Ivanov",
   sex: "male",

}
var b = {
   name: "Petr",
   surname: "Petrov",
   fathername: "Petrovich",
}
var c = {
   name: "Stepan",
   surname: "Stepanov",
   age: 33,
}
var persons = []
persons.push(a, b, c, {
   name: "Vasya", surname: "Vasiliev", fathername: "Vasilievich"
})
for (let i = 0; i < persons.length; i++) {
   if (persons[i].name && persons[i].surname) {
      persons[i].fullName = persons[i].name + " " + persons[i].surname;
   }
   else if (persons[i].fathername) { persons[i].fullName = persons[i].name + " " + persons[i].fathername + " " + persons[i].surname; }

   console.log(persons[i].fullName)
}


// serialize//////////////////////////////////
JSON.stringify(persons)


// deserialize////////////////////////////////
persons.push(JSON.parse('{"name":"Steve","surname":"Jobs","sex":"male"}'))
console.log(persons)

// HTML///////////////////////////////////////
var str = "<table border='1'>\n"
for (let i = 0; i < persons.length; i++) {

   console.log(persons[i]);
   str += `<tr><td>${persons[i].name}</td>\n
   <td>${persons[i].surname}</td></tr>\n`
}
str += "</table>"

console.log(str)
document.write(str)

// HTML optional fields///////////////////////
// var a = {
//    name: "Ivan",
//    surname: "Ivanov",
//    fathername: "Ivanovich",
//    sex: "male",
//    age: 33,
// }
// var b = {
//    name: "Petr",
//    surname: "Petrov",
//    fathername: "Petrovich",
//    sex: "male",
//    age: 33,
// }
// var c = {
//    name: "Stepan",
//    surname: "Stepanov",
//    fathername: "Stepanovich",
//    sex: "male",
//    age: 33,
// }
// var persons1 = []
// persons1.push(a, b, c, {
//    name: "Vasya", surname: "Vasiliev", fathername: "Vasilievich", sex: "male", age: 33,
// })
// for (let i = 0; i < persons1.length; i++) {
//    console.log(persons1[i]);
// }
var str = "<table border='1'>"
for (let i = 0; i < persons1.length; i++) {

   console.log(persons1[i]);
   str += `<tr><td>${persons1[i].name}</td><td>${persons1[i].surname}</td>
   <td>${persons1[i].fathername}</td><td>${persons1[i].age}</td><td>${persons1[i].sex}</td></tr>`
}
str += "</table>"
console.log(str)
document.write(str)



// HTML tr color//////////////////////////////
var str = "<table border='1'>"
for (let i = 0; i < persons1.length; i++) {
   console.log(persons1[i]);
   if (i % 2 === 0) {
      str += `<tr style="background-color:maroon"><td>${persons1[i].name}</td><td>${persons1[i].surname}</td>
   <td>${persons1[i].fathername}</td><td>${persons1[i].age}</td><td>${persons1[i].sex}</td></tr>`
   }
   else {
      str += `<tr><td>${persons1[i].name}</td><td>${persons1[i].surname}</td>
   <td>${persons1[i].fathername}</td><td>${persons1[i].age}</td><td>${persons1[i].sex}</td></tr>`
   }
}
str += "</table>"
console.log(str)
document.write(str)


// HTML th optional///////////////////////////