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+<!DOCTYPE html>
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+<html lang="en">
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+ <head>
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+ <meta charset="UTF-8" />
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+ <meta http-equiv="X-UA-Compatible" content="IE=edge" />
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+ <meta name="viewport" content="width=device-width, initial-scale=1.0" />
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+ <title>Document</title>
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+ </head>
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+ <body>
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+ <script>
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+ // -----------------------sort
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+
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+ var 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(array, objectKey, boolean) {
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+ if (boolean) {
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+ array.sort((a, b) =>
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+ a[objectKey] < b[objectKey] ? 1 : -1
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+ );
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+ } else {
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+ array.sort((a, b) =>
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+ a[objectKey] > b[objectKey] ? 1 : -1
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+ );
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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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+
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+ // ------------------------array map
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+
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+ var array = ["1", {}, null, undefined, "500", 700];
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+
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+ // array.map( a => (a === Number ? +a : a))
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+
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+ let b = array.map((a) => {
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+ let number = Number(a);
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+ return isNaN(a) ? a : number;
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+ });
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+ console.log(b);
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+
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+ // ------------------------array reduce
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+
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+ var array2 = ["0", 5, 3, "string", null];
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+ let productNumber = array2.reduce(function (a, b) {
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+ if (typeof b === "number") {
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+ a *= b;
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+ }
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+ return a;
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+ }, 1);
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+ console.log(productNumber);
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+
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+ // ------------------------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 filter(obj, callBack) {
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+ let newObj = {};
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+
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+ for (let key in obj) {
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+ if (callBack(key, obj[key])) {
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+ newObj = obj[key];
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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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+ filter(phone, (key, value) => key == "color" || value == 2);
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+
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+ //-----------------------object map
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+
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+ function map(obj, callBack) {
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+ let result = {};
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+ for (let key in obj) {
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+ result = { ...result, ...callBack(key, obj[key]) };
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+ return result;
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+ }
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+ }
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+
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+ map({ 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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+ //-----------------------Рекурсия
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+
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+ function progression_sum(max_num_in_progressian) {
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+ if (max_num_in_progressian === 1) return 1;
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+
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+ console.log(max_num_in_progressian);
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+ let result =
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+ progression_sum(max_num_in_progressian - 1) +
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+ max_num_in_progressian;
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+ console.log(max_num_in_progressian, result);
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+
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+ return result;
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+ }
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+
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+ console.log(progression_sum(5));
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+
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+
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+ </script>
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+ </body>
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+</html>
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