Homework/08/script.js

//-----------------------------------------------------------sort---------------------------------------------------------------------------

var persons = [{
        name: "Иван",
        age: 17
    },
    {
        name: "Мария",
        age: 35
    },
    {
        name: "Алексей",
        age: 73
    },
    {
        name: "Яков",
        age: 12
    },
]

function sort(array, key, increase = true) {
    if (increase) {
        array.sort(function (a, b) {
            if (a[key] > b[key]) {
                return 1;
            }
            if (a[key] < b[key]) {
                return -1;
            }
            return 0;
        });
    } else {
        array.sort(function (a, b) {
            if (a[key] < b[key]) {
                return 1;
            }
            if (a[key] > b[key]) {
                return -1;
            }
            return 0;
        });
    }
    return array;
};

// console.log(sort(persons, "age")); //сортирует по возрасту по возрастанию
// console.log(sort(persons, "name"));
// console.log(sort(persons, "age", true));
// console.log(sort(persons, "name", true));
// console.log(sort(persons, "name", false)); //сортирует по имени по убыванию
// console.log(sort(persons, "age", false)); //сортирует по имени по убыванию

//-----------------------------------------------------------array map----------------------------------------------------------------------

let arrayMap = ["1", {}, null, undefined, "500", 700];

let arrayMap2 = arrayMap.map((item) => {
    if (typeof item == "string") return isNaN(parseInt(item, 10)) ? item : parseInt(item, 10);
    return item;
});

// console.log(arrayMap2);

//-----------------------------------------------------------array reduce--------------------------------------------------------------------

let arrayReduce = ["0", 5, 3, "string", null];

let arrayPow = arrayReduce.reduce((a, b) => (typeof b == "number" ? a * b : a), 1);

console.log(arrayPow);

//-----------------------------------------------------------object filter--------------------------------------------------------------------

var phone = {
    brand: "meizu",
    model: "m2",
    ram: 2,
    color: "black",
};

function filter(obj) {
    let obj2 = {};
    for (let key in obj) {
        if (key == "color" || obj[key] == 2) {
            obj2[key] = obj[key];
        }
    }
    return obj2;
}

console.log(filter(phone));

//-----------------------------------------------------------object map--------------------------------------------------------------------