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@@ -0,0 +1,129 @@
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+//1.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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+// if(boolean) {
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+// arr.sort(((a, b) => a[key] > b[key] ? 1 : -1));
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+// }
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+// else{
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+// arr.sort(((a, b) => a[key] < b[key] ? 1 : -1));
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+// }
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+// }
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+
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+// sort(persons, "age");
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+// sort(persons, "name", false);
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+// console.log(persons);
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+
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+//2.array map
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+// let arr = ["1", {}, null, undefined, "500", 700];
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+// console.log(arr.map(item => isNaN(item) ? item : parseInt(item) || null));
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+
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+//3.array reduce
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+// let arr = ["0", 5, 3, "string", null];
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+// let reduce = arr.reduce (function(a, b) {
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+// return((typeof(b) === 'number') ? (a *= b) : a);
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+// }, 1)
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+// console.log(reduce);
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+
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+//4.object filter
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+// let 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 filter (obj, f){
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+// for(let key in obj){
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+// if(!f(key, obj[key])){
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+// delete obj[key];
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+// }
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+// }
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+// return obj;
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+// }
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+
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+// filter(phone, (key, value) => key == "color" || value == 2);
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+// console.log(phone);
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+
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+//5.object map
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+// function map (obj, f){
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+// let res = {};
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+// for(let key in obj){
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+// res[key] = obj[key];
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+// }
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+// return res;
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+// }
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+
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+// let objMap = map({name: "Иван", age: 17},function(key,value){
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+// let result = {};
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+// result[key+"_"] = value + "$";
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+// return result;
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+// });
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+
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+// console.log(objMap);
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+
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+//6.Рекурсия
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+//Sum
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+// function sum (num){
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+// if(num === 0){
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+// return 0;
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+// }
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+// else{
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+// return num + sum(num-1);
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+// }
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+// }
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+
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+// console.log(sum(3));
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+
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+//HTML Tree
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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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+function a (obj){
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+ let res = '';
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+ for(let elem in obj){
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+ let el = obj[elem];
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+ if('subTags' in el){
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+ res += `<${el['tagName']}> ${a(el['subTags'])} </${el['tagName']}>`;
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+ }
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+ else{
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+ res += `<${el['tagName']}> ${el['text']} </${el['tagName']}>`;
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+ }
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+ }
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+ return res;
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+}
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+
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+let str = '';
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+if('tagName' in someTree){
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+ str += `<${someTree.tagName} border='1'>`;
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+}
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+str += a(someTree['subTags']);
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+str += `</${someTree.tagName}>`;
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+
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+console.log(str);
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+document.write(str);
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