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@@ -0,0 +1,103 @@
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+<!DOCTYPE html>
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+<html lang="en">
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+
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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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+
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+<body>
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+ <script>
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+ //sort
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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(arr, key, boolean = true) {
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+ arr.sort(bool)
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+ function bool(a, b) {
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+ if (boolean) {
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+ return (a[key] > b[key]) ? 1 : -1;
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+ }
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+ else {
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+ return (a[key] < b[key]) ? 1 : -1;
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+ }
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+ }
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+ return arr;
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+ }
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+
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+ sort(persons, "name")
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+
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+
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+ //array map
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+ let array = ["1", {}, null, undefined, "500", 700]
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+ let y = array.map(x => {
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+ let number = Number(x)
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+ return isNaN(x) ? x : number
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+ })
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+ console.log(y)
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+
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+ //array reduce
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+ let array = ["0", 5, 3, "string", null]
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+ let result = array.reduce((a, b) =>
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+ typeof (b) === "number" ? a * b : a, 1
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+ )
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+ console.log(result);
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+
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+ //object filter
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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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+ filter(phone, (key, value) => key == "color" || value == 2);
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+
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+ function filter(obj, key, value) {
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+ let newObj = {}
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+ for (let key in obj) {
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+ for (let value in obj) {
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+ if (obj[key] == 2 && value == "color") {
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+ newObj[key] = obj[key]
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+ newObj[value] = obj[value]
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+ }
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+
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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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+ //object map
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+ function map(obj, callback) {
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+ let result1 = {};
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+ for (let key in obj) {
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+ result1 = { ...result1, ...callback(key, obj[key]) }
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+ }
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+ return result1
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+ }
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+
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+ let miniObj = 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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+ })
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+ console.log(miniObj)
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+
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+ //Sum
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+ function sum (min, max, step){
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+ if(max <= 0){
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+ return 0
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+ }
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+ return sum (min +step, max -1, step) + min
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+ }
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+ console.log(sum(1,5,3))
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+
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+ </script>
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+</body>
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+
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+</html>
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