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@@ -0,0 +1,301 @@
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+// Task 3 persons
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+let a = {
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+ name: "Vika",
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+ surname: "Yurchenko",
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+};
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+let b = {
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+ name: "Ivan",
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+ surname: "Ivanov",
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+};
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+let c = {
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+ name: "Petro",
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+ surname: "Petrov",
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+};
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+
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+
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+
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+// Task different fields
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+a.age = "15";
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+b.fathername = "Petrovna";
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+c.sex = "m";
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+
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+
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+//Task fields check
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+// let result = typeof(a.key);
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+// alert(result);
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+
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+// if ('key' in a) {
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+// alert('yes');
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+// };
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+
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+
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+//Task array of persons
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+let persons = [{name: "Dima", surname: "Dimon"}];
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+persons.push(a, b, c);
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+
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+
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+//Task loop of persons
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+// for (let i = 0; i < persons.length; i++) {
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+// console.log(persons[i]);
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+// };
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+
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+
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+//Task loop of name and surname
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+// for (let i = 0; i < persons.length; i++) {
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+// let name = persons[i].name;
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+// let surname = persons[i].surname;
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+// console.log( name, surname);
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+// };
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+
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+
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+//Task loop of loop of values
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+
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+// for (let i = 0; i < persons.length; i++) {
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+// let vallues = persons[i];
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+// for (key in persons[i] ) { c
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+// console.log(persons[i][key]);
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+// };
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+// };
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+
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+
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+// Task fullName
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+// for (let i = 0; i < persons.length; i++ ) {
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+// if (persons[i].name && persons[i].surname) {
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+// persons[i].fullName = '';
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+// };
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+// };
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+// console.log(persons);
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+
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+
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+
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+//Task serialize
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+// let stringJson = JSON.stringify(persons);
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+// console.log(stringJson);
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+
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+
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+//Task deserialize
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+// let strJson = '{"name": "Vova", "surname": "Vovanov"}';
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+// persons.push( JSON.parse(strJson) );
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+// console.log(persons);
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+
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+
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+
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+//Task HTML
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+// var str = "<table border='1'>"
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+// for (let i=0;i < persons.length; i++){
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+// str += '<tr>';
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+// for (key in persons[i]) {
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+// str += `<th> ${key}<th> <th> ${persons[i][key]} </th>`;
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+// };
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+// str +='</tr>' ;
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+// };
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+// str += "</table>"
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+
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+// console.log(str);
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+// document.write(str);
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+
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+
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+// Task HTML tr color
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+// var str = "<table border='1'>"
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+// for (let i=0;i < persons.length; i++){
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+// let tr = '<tr>';
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+// if (i % 2 == 0) {
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+// tr = '<tr style="background-color: red">';
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+// str += tr;
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+// };
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+// if (i % 2 != 0 ) {
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+// str += tr;
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+// };
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+// for (key in persons[i]) {
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+// str += `<th> ${key}<th> <th> ${persons[i][key]} </th>`;
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+// };
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+// str += '</tr>';
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+// };
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+// str += "</table>"
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+
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+// console.log(str);
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+// document.write(str);
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+
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+
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+//Task HTML th optional
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+// let str = "<table border='1'>";
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+// let tr = '<tr>';
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+// let property = [];
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+
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+// for (let i = 0; i < persons.length; i++ ) {
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+// for (key in persons[i]) {
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+// property.push(key);
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+// };
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+// };console.log(property);
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+
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+// let propertyFiltr = property.filter(function(item, pos) {
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+// return property.indexOf(item) == pos;
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+// }); console.log(propertyFiltr);
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+
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+// str += tr;
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+
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+// for (let i = 0; i < propertyFiltr.length; i++){
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+// str += `<th> ${propertyFiltr[i]} </th>`;
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+// };
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+// str +='</tr>';
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+
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+// for (let i = 0; i < persons.length; i++) {
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+// str += tr;
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+// for (let q = 0; q < propertyFiltr.length; q++) {
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+
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+// if(persons[i][propertyFiltr[q]] != undefined) {
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+// str += `<td> ${persons[i][propertyFiltr[q]]} </td>`;
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+// };
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+// if(persons[i][propertyFiltr[q]] == undefined) {
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+// str += `<td> - </td>`;
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+// };
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+
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+// };
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+// str += '</tr>';
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+// };
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+// str += "</table>";
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+
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+// console.log(str);
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+// document.write(str);
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+
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+
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+//Task Задание на синий пояс.
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+// function changeObjInHtmlTree (obj) {
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+// let str = '';
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+// let {tagName, subTags, text, attrs} = obj;
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+
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+// str += `<${tagName} `;
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+
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+// if (attrs){
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+// for (let [key, value] of Object.entries(attrs)){
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+// str += `${key} = ${value}`;
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+// };
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+// };
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+
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+// str += `>`;
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+
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+// if (text) {
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+// str += `${text}`;
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+// };
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+
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+// if (subTags) {
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+// let children = subTags;
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+
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+// for (let i = 0; i < children.length; i++) {
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+
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+// let {tagName, subTags, text, attrs} = children[i];
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+// str += `<${tagName}`;
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+
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+// if (attrs){
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+// for (let [key, value] of Object.entries(attrs)){
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+// str += `${key} = ${value}`;
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+// };
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+// };
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+
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+// if (text) {
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+// str += `${text}`;
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+// };
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+// str += `>`;
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+
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+// if (subTags) {
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+// let children1 = subTags;
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+
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+// for (let q = 0; q < children1.length; q++){
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+// let {tagName, subTags, text, attrs} = children1[q];
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+// str += `<${tagName}> `;
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+
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+// if (attrs){
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+// for (let [key, value] of Object.entries(attrs)){
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+// str += `${key} = ${value}`;
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+// };
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+// };
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+
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+// if (text) {
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+// str += `${text}`;
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+// };
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+
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+// str += `</${tagName}>\n`;
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+// };
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+// str += `</${tagName}>\n`;
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+// };
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+// };
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+// };
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+// str += `</${tagName}>`;
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+// return (console.log(str));
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+// };
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+
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+// var someTree = {
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+// tagName: "table", //html tag
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+// subTags: [ //вложенные тэги
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+// {
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+// tagName: "tr",
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+// subTags: [
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+// {
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+// tagName: "td",
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+// text: "some text",
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+// },
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+// {
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+// tagName: "td",
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+// text: "some text 2",
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+// }
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+// ]
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+// }
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+// ],
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+// attrs:
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+// {
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+// border: 1,
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+// },
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+// };
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+
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+// changeObjInHtmlTree(someTree);
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+
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+
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+//Task destruct array
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+// let arr = [1,2,3,4,5, "a", "b", "c"];
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+// let [ odd1, even1, odd2, even2, odd3, ...arr1] = arr;
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+
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+
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+//Task destruct string
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+// let arr = [1, "abc"];
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+// let [number, [s1, s2, s3] ] = arr;
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+
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+
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+//Task destruct 2
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+// let obj = {name: 'Ivan',
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+// surname: 'Petrov',
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+// children: [{name: 'Maria'}, {name: 'Nikolay'}]}
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+
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+// let {name, surname, children: [{name: name1}, {name: name2} ]} = obj;
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+
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+
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+
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+//Task destruct 3
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+// let arr = [1,2,3,4, 5,6,7,10];
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+//let {length} = arr;
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+// let {0:n, 1:m, length} = arr; //a, b has already been declared
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+
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+
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+//Task Задание на черный пояс
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+
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+// let history = "1212";
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+// let newValue = '1';
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+// let predictArray = {};
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+
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+// for (let i = 0; newValue !== null; i++) {
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+
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+// let predictValue = predictArray[history];
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+
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+// newValue = prompt('Enter number 1 or 2');
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+
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+
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+// if (!(predictArray.hasOwnProperty(history))) {
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+// predictArray[history] = newValue;
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+// predictValue = Math.round( Math.random() * 2);
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+// };
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+
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+// history += newValue;
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+// history = history.substring(1);
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+
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+
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+// newValue == predictValue ? alert('You are not winner') : alert('you guessed');
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+// };
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