// html tree

let body = {
    tagName: "body",
    subTags: [
        {tagName: 'div',
            subTags:[
{tagName:'br'},
{tagName:'span', text: 'Enter a data please:'},
{tagName:'input', attrs:{type:'text', id:'name'}},
{tagName:'input', attrs:{type:'text', id:'surname'}}
]},
        
        {tagName: 'div',
            subTags:[
{tagName:'button', text:'OK', attrs:{id:'ok'}},
{tagName:'button', text:'Cancel', attrs:{id:'cancel'}}
]}
            ]
}
body.subTags[1].subTags[1].text
body.subTags[0].subTags[3].attrs.id

// declarative fields

let notebook = {
    brand: prompt('Enter  brand'),
    type:  prompt('Enter  type'),
    model: prompt('Enter  model'),
    ram: +prompt('Enter  ram'),
    size: prompt('Size'),
    weight: +prompt('Weight'),
    resolution: {
        width: +prompt ('Width'),
        height: +prompt ('Height'),
    },
};

let phone = {
    brand: prompt('Enter brand'),
    model: prompt('Enter model'),
    ram: +prompt('Enter ram'),
    color: prompt('Enter color'),
};

let person = {
    name: prompt('Enter a name'),
    surname: prompt('Enter a surname'),
    married: confirm(),
}

// object links

let person1 
let smartphone = {
    "owner": person1
}
let laptop = {
    "owner": person1
}
person1 = {
    "name": prompt('Enter name'),
    "surname": prompt('Enter surname'),
    "smartphone":{ 
        "owner": {person1}},
        "laptop":{ 
            "owner":{ person1}},
}
person1['laptop'].owner = person1
person1['smartphone'].owner = person1

person1.smartphone.owner.laptop.owner.smartphone == person1.smartphone
true


// imperative array fill 3

let array = [];
array[0] = +prompt();
array[1] = +prompt();
array[2] = +prompt();

// while confirm 

while(answer !== true){
    var answer = confirm("True or False?")}

// array fill

let array1 = [];
let filling = '';
while(filling != null){
    filling = prompt('введите число'),
     array1.push(filling);
}

// array fill nopush

let array2 = [];
let i = 0;
let filling1 = '';
while(filling1 != null){
    filling1 = prompt('введите число')
     array2[i] = filling1;
     i++
}

// infinite probability:
// через for
for(i = 0,b=1;i<0.9;b++){
    i = Math.random()};       
alert(`Прошло ${b} итерации`)
// через while
let b = 0;
let a  = 0;
while(b<0.9){
    b = Math.random()
     a++}
alert(`${b} iteration`)

// empty loop

let values;
while(values == prompt()){}

// progression sum

let sum = 0;
for(i = 1; i < 50; i+=3){
    sum = sum + i}
    console.log(sum);

    
// chess one line

let c = '';
for(y = 0;y < 16;y++){
    if(y % 2 === 1){
c = c + '#'} 
    else {
c = c + '.'}}


// numbers
let str = ''
for(i=0;i<10;i++){
     str += '\n'
    for(j=0;j<10;j++){
        str+=j
    } 
}console.log(str)

// chess

let strn = ''
for(f = 0;f<5;f++){
strn += '\n'
for(y = 0;y < 12;y++){
    if(y % 2 === 1){
strn += '#'} 
    else {
strn += '.'}}
strn += '\n'
for(y = 0;y < 12;y++){
    if(y % 2 === 1){
strn += '.'} 
    else {
strn += '#'}}}
console.log(strn)

// cubes;

for(i = 0,arr = [];i <= 100; i++){
    arr.push((i**3));
    console.log(arr[i])}

// multiply table
var multTable = [];
for (let i = 1;i < 10; i++){
    multTable[i] = []
    for(let j = 1; j < 10; j++){
        multTable[i][j] = i * j;
    }
}