//3 persons
//different fields
//fields check
let a = {
    name : "Johnny",
    surname : "Depp",
}
a.age = 59;

let b = {
    name : "Brad",
    surname : "Pitt",
}
b.fathername = "William";

let c = {
    name : "Leonardo",
    surname : "Dicaprio",
}

c.sex = "man";

if ("age" in a) {
    alert("age in a")
}
if ("fathername" in b) {
    alert("fathername in b")
}
if ("sex" in c){
    alert("sex in c")
}

//array of persons

a = {
    name : "Johnny",
    surname : "Depp",
};
b = {
    name : "Brad",
    surname : "Pitt",
};
c = {
    name : "Leonardo",
    surname : "Dicaprio",
};

let persons = [a, b, c];
let d = {
    name : "Vasya",
    surname : "Pupkin",
};
persons.push(d)

//loop of persons

for(let i in persons){
    console.log(persons[i])
};

//loop of name and surname
for(let i in persons){
    console.log(persons[i].name, 
                persons[i].surname)
};

//loop of loop of values
for(let i in persons){ 
    for (let values in persons[i]) {
        console.log(persons[i] [values]);
    }   
};

//fullName
for(let i in persons) {
    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":"Rocky", "surname":"Balboa"}`));

//HTML
let str = "<table border='1'>";
for (let i = 0; i < persons.length; i++) {
    for (let j in persons[i]) {
        str += `<tr><td>${j}</td><td>${persons[i][j]}</td></tr>`
    }
}
str += "</table>";
console.log(str);
document.write(str);

//HTML tr color

let strColor = "<table border='1'>";
for(let i = 0; i < 4; i++){
    for(let j in persons[i]) {
        strColor += `<tr style = color:red;><td>${j}</td><td>${persons[i][j]}</td></tr>`
    }
}
strColor +="</table>";
console.log(strColor);
document.write(strColor);

// destruct array
    
let arr = [1,2,3,4,5, "a", "b", "c"]
let [odd1,even1,odd2,even2,odd3,...letters] = arr;

// destruct string
    
let arr1 = [1, "abc"]
let [number, [s1,s2,s3]] = arr1

// destruct 2
    
let obj = {name: 'Ivan',
               surname: 'Petrov',
               children: [{name: 'Maria'}, {name: 'Nikolay'}]}
    
               let {children:[{name:name1},{name:name2}]} = obj
    
// destruct 3
    
let arr2 = [1,2,3,4, 5,6,7,10]
let {0:a,1:b,length} = arr2