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--------------------------------------------------------------------

let someObject = {
    name: "Иван",
    age: 17
};

function map(obj) {
    let temp = {};
    for (let i in obj) {
        temp[i + '_'] = i + '$';
    }
    return temp;
}

console.log(map(someObject));

//-----------------------------------------------------------recursion--------------------------------------------------------------------

function arithmeticProgression(num, increment, rows) {
    if (rows <= 1) {
        return num;
    }
    return num + arithmeticProgression(num + increment, increment, rows - 1)
}

console.log(arithmeticProgression(1, 4, 8));

//-----------------------------------------------------------HTML Tree--------------------------------------------------------------------

var someTree = {
    tagName: "table", //html tag
    children: [ //вложенные тэги
        {
            tagName: "tr",
            children: [{
                    tagName: "td",
                    text: "some text",
                },
                {
                    tagName: "td",
                    text: "some text 2",
                }
            ]
        }
    ],
    attrs: {
        border: 1,
    },
}

function construct(obj) {
    let node = document.createElement(obj.tagName);
    if ("attrs" in obj) {
        for (let attrName in obj.attrs) {
            node.setAttribute(attrName, obj.attrs[attrName])
        }
    }

    if ("children" in obj) {
        for (let child in obj.children) {
            node.append(construct(obj.children[child]));
        }
    }

    if ("text" in obj) {
        node.innerText = obj.text;
    }
    return node;
}


document.body.append(construct(someTree));

console.log(construct(someTree));



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