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+// Task sort
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+// let persons = [
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+// {name: "Иван", age: 17},
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+// {name: "Мария", age: 35},
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+// {name: "Алексей", age: 73},
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+// {name: "Яков", age: 12},
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+// ];
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+
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+// function sort (arr, key, boolean = true) {
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+// for (let i = 0; i < (arr.length - 1); i++) {
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+// for (let q = 0; q < arr.length - 1; q++) {
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+// if (arr[q][key] > arr[q + 1][key]) {
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+// let b = arr[q];
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+// arr[q] = arr[q + 1];
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+// arr[q + 1] = b;
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+// };
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+// if ((arr[q][key] < arr[q + 1][key]) && !boolean ) {
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+// let b = arr[q];
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+// arr[q] = arr[q + 1];
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+// arr[q +1] = b;
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+// };
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+// };
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+// };console.log(arr);
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+// return arr;
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+// };
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+
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+// sort(persons, 'name', false);
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+
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+
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+//Task array map
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+
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+// let myArray = ["1", {}, null, undefined, "500", 700];
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+
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+// function changStringToNumber (arr) {
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+// for (let i = 0; i < arr.length; i++) {
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+// if (typeof (arr[i]) === 'string') {
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+// arr[i] = +arr[i];
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+// };
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+// };
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+// console.log(arr);
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+// return arr;
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+// };
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+
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+// changStringToNumber(myArray);
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+//2
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+// let myArray = ["1", {}, null, undefined, "500", 700];
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+// let newArray = myArray.map( function (value) {
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+// if (typeof(value) === 'string') {
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+// value = +value;
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+// return value;
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+// };
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+// return value;
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+// });
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+// console.log(newArray);
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+
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+
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+
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+
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+//Task array reduce
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+
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+// let myArray = ["0", 5, 3, "string", null];
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+
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+// function multiplicationStrings (arr) {
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+// let result = 1;
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+// for (let i = 0; i < arr.length; i++) {
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+// if (typeof (arr[i]) === 'number') {
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+// result *= (+arr[i]);
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+// };
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+// };
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+// console.log(result);
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+// return result;
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+// };
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+
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+// multiplicationStrings(myArray);
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+//2
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+
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+// let myArray = ["0", 5, 3, "string", null];
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+// let result = myArray. reduce(function multiplicationStrings (acum, curentVal) {
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+// if (typeof(curentVal) === 'number') {
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+// return (acum * curentVal);
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+// };
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+// return acum;
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+// }, 1);
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+// console.log(result);
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+
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+
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+//Task object filter
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+
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+// var phone = {
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+// brand: "meizu",
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+// model: "m2",
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+// ram: 2,
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+// color: "black",
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+// };
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+
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+// function myFilter (obj, func) {
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+// let newObj = {};
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+// for (let key in obj) {
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+// let checkArg = func (key, value =obj[key]);
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+// if (checkArg) {
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+// newObj[key] = value;
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+// };
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+// };
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+// return newObj;
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+// };
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+
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+
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+// let check = myFilter(phone,(key,value) => key == "color" || value == 2);
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+// console.log (check);
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+
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+
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+//Task object map
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+
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+// function myMap (obj, func) {
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+// let newObj = {};
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+// for (let key in obj) {
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+// let checkArg = func (key, value =obj[key]);
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+// Object.assign(newObj,checkArg);
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+// };
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+// return newObj;
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+// };
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+// let check = myMap({name: "Иван", age: 17},function(key,value){
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+// var result = {};
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+// result[key+"_"] = value + "$";
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+// return result;
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+// }); //должен вернуть {name_: "Иван$", age_: "17$"}
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+
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+// console.log(check);
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+
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+
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+
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+// Task Sum
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+
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+// function calculationSumArithmProgr (a, d, n) {
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+
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+// if (n === 1) {
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+// return a;
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+// };
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+
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+// return (calculationSumArithmProgr(a, d, n-1) + (a + d * (n - 1)));
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+// };
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+
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+// let check = calculationSumArithmProgr(5, 7, 3);
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+// console.log(check);
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+
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+
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+//Task HTML Tree
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+var someTree = {
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+ tagName: "table", //html tag
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+ children: [ //вложенные тэги
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+ {
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+ tagName: "tr",
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+ children: [
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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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+function builder (obj) {
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+ let {tagName, attrs, text, children} = obj;
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+
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+ let attributes = '';
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+
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+ if (attrs) {
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+ for (const [key, value] of Object.entries(attrs)) {
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+ attributes += `${key} = ${value}` ;
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+ };
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+ };
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+
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+ if (!children) {
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+ return `<${tagName} ${attributes}>${text}</${tagName}>`;
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+ };
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+
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+ let siblings = '';
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+
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+ for (let i = 0; i < children.length; i++) {
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+ siblings += `${builder(children[i])}\n`;
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+ };
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+
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+ return `<${tagName} ${attributes}>\n ${siblings}</${tagName}>\n`;
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+};
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+
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+let check = builder(someTree);
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+
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+document.write(check);
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