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+//1.html tree
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+// let body = {
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+// subTags : [
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+// {tagName : 'div',
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+// subTags : [
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+// {tagName : 'span',
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+// text : 'Enter a data please:'
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+// },
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+// {tagName : 'br'},
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+// {tagName : 'input',
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+// attrs : {
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+// type: 'text',
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+// id : 'name'
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+// }},
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+// {tagName : 'input',
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+// attrs : {
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+// type: 'text',
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+// id : 'surname'
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+// }},
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+// ]},
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+// {tagName : 'div',
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+// subTags : [
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+// {tagName : 'button',
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+// attrs : {
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+// id : 'ok',
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+// },
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+// text : 'OK'
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+// },
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+// {tagName : 'button',
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+// attrs : {
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+// id : 'cancel',
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+// },
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+// text : 'Cancel'
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+// }
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+// ]}
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+// ]
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+// };
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+// console.log(body.subTags[1].subTags[1].text);
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+// console.log(body.subTags[0].subTags[3].attrs.id);
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+
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+//2.declarative fields, 3.object links
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+// let person = {
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+// name : prompt('Your name?', ""),
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+// age : prompt('How old are you?', ""),
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+// pets : confirm('Do you have pets?'),
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+// car : confirm('Do you have a car?'),
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+// education : {
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+// school : prompt('When did you finished school?', ""),
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+// university : confirm('Are you studing in university'),
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+// sub : prompt('What are you studing or were studing in university?', "")
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+// },
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+// parents : {
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+// mother : prompt('What is your mother name?', ""),
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+// father : prompt('What is your father name?', "")
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+// },
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+// family : confirm('Do you have brother or sister?')
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+// };
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+
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+// person.smartphone = new Object ({smartphone_name : prompt('Which smartphone do you have?', ""), smartphone_owner : confirm('Are you owner of this smartphone?')});
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+// person.laptop = new Object ({laptop_name : prompt('Which laptop do you have?', ""), laptop_owner : confirm('Are you owner of this laptop?')});
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+
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+// console.log(person);
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+
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+//3.imperative array fill 3
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+// let arr = [];
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+// arr[0] = prompt('Name?');
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+// arr[1] = prompt('Age?');
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+// arr[2] = prompt('City?');
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+// console.log(arr);
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+
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+//4.while confirm
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+// let qw = confirm('Are you here?');
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+// while (qw == false) {
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+// confirm('Are you here?');
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+// if(qw == true) {
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+// break;
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+// }
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+// }
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+
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+//5.array fill
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+// let arr = [];
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+// let el = prompt('Which color?', '');
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+// while(el !== null) {
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+// arr.push(el);
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+// el = prompt('Which color?', '');
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+// }
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+// console.log(arr);
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+
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+//6.array fill nopush
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+// let arr = [];
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+// let el = prompt('Which color?', '');
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+// let i = 0;
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+// while(el !== null) {
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+// arr[i] = el;
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+// el = prompt('Which color?', '');
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+// i++;
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+// }
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+// console.log(arr);
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+
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+//7.infinite probability
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+// let rand = Math.random();
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+// let x = 0;
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+// while (true){
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+// x++;
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+// rand = Math.random();
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+// if(rand > 0.9) {
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+// break;
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+// }
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+// }
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+// alert(`Количество итераций: ${x}`);
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+// console.log(rand);
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+
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+//8.empty loop
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+// let promptValue = prompt('smth');
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+// while(promptValue === null){
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+// x = prompt('smth');
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+// if (promptValue !== null) {
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+// break;
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+// }
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+// }
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+
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+//9.progression sum
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+// let sum = 0;
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+// function countSum (n) {
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+// for (let i = 1; i < n; i += 3) {
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+// sum += i;
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+// }
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+// return sum;
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+// }
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+// console.log(countSum(10));
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+
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+//10.chess one line
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+// let str = '';
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+// for(let i = 0 ; i < 15; i++) {
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+// str += '# ';
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+// }
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+// console.log(str);
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+
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+//11.numbers
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+// let str = '';
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+// for(let r = 0; r < 10; r++){
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+// for(let c = 0; c < 10; c++){
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+// str += c;
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+// }
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+// str += '\n';
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+// }
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+// console.log(str);
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+
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+//12.chess
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+// let str = '';
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+// for(let i = 0; i < 10; i++){
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+// for(let x = 0; x < 6; x++){
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+// i % 2 == 0 ? (str += '#.') : (str += '.#');
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+// }
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+// str += '\n';
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+// }
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+// console.log(str);
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+
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+//13.cubes
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+// function cube(n){
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+// let arr = [];
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+// for(let i = 0; i < n; i++){
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+// let cub = i*i*i;
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+// arr.push(cub);
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+// }
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+// return arr;
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+// }
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+// console.log(cube(10));
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+
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+//14.multiply table
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+// let arr = [];
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+// for(let i = 0; i < 10; i++){
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+// arr[i] = [];
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+// for(let x = 0; x < 10; x++){
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+// arr[i] [x] = i * x;
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+// }
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+// }
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+// console.log(arr);
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+
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+
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+//15.matrix to html table
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+// let str = '<table>';
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+// for(let i = 1; i < 10; i++){
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+// str += '<tr>';
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+// for(let x = 1; x < 10; x++){
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+// str += '<td>';
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+// str += i*x;
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+// str += '</td>';
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+// }
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+// str += '</tr>';
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+// }
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+// str += '</table>';
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+// document.write(str);
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+// console.log(str);
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+
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+//16.Задание на синий пояс: Треугольник
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+// function triangle (lineLenght, lines = 7){
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+// let start = Math.trunc(lineLenght / 2);
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+// let end = Math.trunc(lineLenght / 2);
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+// let str = '';
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+// for(let i = 0 ; i < lines; i++){
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+// for(let x = 0; x < lineLenght; x++){
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+// if(x < start || x > end){
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+// str += '.';
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+// }
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+// else {
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+// str += '#';
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+// }
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+// }
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+// str += '\n';
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+// start -= 1;
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+// end += 1;
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+// }
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+// return str;
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+// }
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+// console.log(triangle(20, 11));
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