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@@ -0,0 +1,142 @@
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+"use strict";
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+
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+//TODO: ES6
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+// let a = msg => alert(msg);
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+
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+// let cube = number => number * number * number;
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+
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+// let avg2 = (a, b) => (a + b) / 2;
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+
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+// let sum3 = (a = 0, b = 0, c = 0) => a + b + c;
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+
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+// let intRandom = (a = 0, b = 0) => Math.round(Math.random() * (b - a)) + a;
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+
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+// let greetAll = (...arguments) => {
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+// for (let i in arguments) {
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+// alert(arguments[i])
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+// }
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+// }
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+
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+// let sum = (...arguments) => {
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+// let sumAll = 0
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+// for (let i in arguments) {
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+// sumAll += arguments[i]
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+// }
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+// return sumAll;
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+// }
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+
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+function sort() {
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+ let persons = [{
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+ name: "Иван",
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+ age: 17
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+ },
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+ {
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+ name: "Мария",
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+ age: 35
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+ },
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+ {
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+ name: "Алексей",
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+ age: 73
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+ },
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+ {
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+ name: "Яков",
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+ age: 12
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+ },
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+ ]
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+
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+ function sort(field, boolean = true) {
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+ if (boolean) {
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+ return (a, b) => a[field] > b[field] ? 1 : -1
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+ } else {
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+ return (a, b) => a[field] < b[field] ? 1 : -1
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+ }
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+ }
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+
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+ console.log(persons.sort(sort('age', false)))
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+}
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+// sort()
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+
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+
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+function arrayMap() {
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+ let arr = ["1", {}, null, undefined, "500", 700];
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+ let newArr = arr.map(item => typeof (item) === "string" ? parseInt(item) : item);
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+ console.log(newArr)
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+}
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+// arrayMap()
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+
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+
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+function arrayReduce() {
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+ let arr = ['0', 5, 3, "string", null];
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+
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+ let result = arr.reduce((sum, currentItem) => {
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+ if (typeof (currentItem) === "number") {
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+ sum *= currentItem;
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+ }
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+ return sum
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+
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+ }, 1)
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+ console.log(result);
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+}
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+// arrayReduce()
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+
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+
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+function objectFilter() {
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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, func) {
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+ for (let key in obj) {
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+ console.log(func)
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+ if (!func(key, obj[key])) {
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+ delete obj[key]
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+ }
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+ }
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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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+// objectFilter()
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+
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+//OR
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+
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+// let newObj = Object.entries(phone)
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+// .filter(item => item[0] === "color" || item[0] === "ram")
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+// .map(item => item);
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+// console.log(newObj)
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+
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+
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+function objectMap() {
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+ function map(object, callback) {
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+ let obj = {};
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+ for (let key in object) {
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+ Object.assign(obj, callback(key, object[key]));
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+ }
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+ return obj
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+ }
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+
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+ let obj = map({
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+ name: "Иван",
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+ age: 17
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+ }, 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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+ console.log(obj);
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+}
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+// objectMap()
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+
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+
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+function recursion() {
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+ let sum = (firstNumber, step, n) => {
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+ return n == 1 ? firstNumber : firstNumber + sum(firstNumber + step, step, n - 1);
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+ }
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+}
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+// recursion()
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+
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+//TODO: HTML Tree (in process...)
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