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							<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <script>
        function arrSort() {
            let persons = [
                {name: "Иван", age: 17},
                {name: "Мария", age: 35},
                {name: "Алексей", age: 73},
                {name: "Яков", age: 12},
            ]       
            function personSort() {
                persons.sort(function(a, b){
                    return b.age - a.age
                })

                persons.sort(function(a, b){
                    let nameA = a.name.toLowerCase();
                    let nameB = b.name.toLowerCase();
                    if (nameA > nameB) 
                        return -1
                    if (nameA < nameB)
                        return 1
                })
            }
        }

        //=====================================================================================================================//

        //=============================================== array map ===========================================================//

        let qwerty = ["1", {}, null, undefined, "500", 700].map((qwerty) => parseInt(qwerty) ? parseInt(qwerty) : qwerty);

        //=====================================================================================================================//

        //=============================================== array reduce ========================================================//

        let myArr = ["0", 5, 3, "string", null].reduce((a,myArr) => (!isNaN(myArr) && typeof myArr === "number" ? a * myArr : a), 1)

        //=====================================================================================================================//

        //=============================================== object filter =======================================================//

        var phone = {
            brand: "meizu",
            model: "m2",
            ram: 2,
            color: "black",
        };
        function filter(arr, func) {
            for (let k in arr) {
                if (!func(k, arr[k])) {
                    delete arr[k]
                } 
            }
            return arr;
        }
        console.log(filter(phone, (key, value) => key == "color" || value == 2));

        //=====================================================================================================================//

        //=============================================== object map ==========================================================//

        const map = function (obj, func) {
            let objNew = {};
            for (let key in obj) {
                objNew = { ...objNew, ...func(key, obj[key]) };
            }
            return objNew;
        };

        let testObj = map({ name: "Иван", age: 17 }, function (key, value) {
            var result = {};
            result[key + "_"] = value + "$";
            return result;
        });
    </script>
</body>
</html>